共查询到20条相似文献,搜索用时 31 毫秒
1.
Veysel T. Yilmaz Evrim Senel Canan Kazak 《Journal of Inorganic and Organometallic Polymers and Materials》2008,18(3):407-413
The reaction of [Cu(sac)2(H2O)4] · 2H2O with 2-methylpyrazine (mpyz) leads two complexes, concomitant crystallization of a mononuclear complex [Cu(sac)2(mpyz)(H2O)2] (1) and a polymeric complex [Cu(sac)2(μ-mpyz)]n (2). Both complexes have been characterized by elemental analyses, magnetic measurements, FT-IR and ESR, TG-DTA and single-crystal
X-ray diffraction analyses. Single-crystal X-ray analyses show that complex 1 consists of discrete molecules in which the copper(II) ions exhibits a square-pyramidal coordination geometry. The individual
molecules of 1 are connected into a hydrogen-bonded chain structure, which is further assembled to form a three-dimensional network by π–π stacking interactions.
Complex 2 is an 1D coordination polymer in which copper(II) centers are bridged by the mpyz ligand. The chains are further assembled
to form two-dimensional frameworks by π–π and C–H···π stacking interactions. 相似文献
2.
Yan-Tuan Li Wei Sun Yong-Jun Zheng Zhi-Yong Wu Cui-Wei Yan 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(1):182-188
A novel 2D sheet-like copper(II) complex formulated [Cu6(trans-oxen)3(μ3-OH)2(H2O)2]n-(ClO4)4n.2nH2O (1), where H2oxen is N,N’-bis(2-aminoethyl)oxamide, has been synthesized and characterized by elemental analysis, IR and UV–visible spectroscopy,
and single-crystal X-ray diffraction. 1 crystallizes in triclinic space group P-1 with crystallographic data: a = 10.299(2) ?, b = 10.833(2) ?, c = 11.781(2) ?, α = 69.95(3)°, β = 81.10(3)°, γ = 62.44(3)°, and Z = 2. In the crystal structure, the cation [Cu6(trans-oxen)3(μ3-OH)2(H2O)2]n4n+ exhibits a two-dimensional sheet-like structure for Cu(II) ions bridged both by trans-oxen and hydroxyl groups. Each Cu(II) ion is located in a slightly distorted square-pyramidal environment. The hydroxyl group
bridges three [Cu(oxen)Cu]2+ dications in which one oxen2− is μ2-bridge while the other two act as never before reported μ4-bridge. Perchlorate anions and H2O molecules are inserted between the sheets and bridge the 2D cations via N–H···O and O–H···O hydrogen bonds to form an infinite
three-dimensional system. The cyclic voltammetric behavior of 1 and the influence of counter ions on structure are preliminarily investigated. 相似文献
3.
Selcuk Demir Veysel T. Yilmaz Fatih Yilmaz Orhan Buyukgungor 《Journal of Inorganic and Organometallic Polymers and Materials》2009,19(3):342-347
Cobalt(II) and zinc(II) succinato (suc) coordination polymers with nicotinamide (nia), {[Co(μ-suc)(H2O)2(nia)2] · 2H2O}
n
(1) and {[Zn(μ-suc)(H2O)2(nia)2] · 2H2O}
n
(2) have been synthesized and characterized by elemental analyses, magnetic moments, IR and TG-DTA. Single-crystal X-ray analyses
of 1 and 2 reveal that these complexes are isostructural and crystallize in triclinic space group Complexes 1 and 2 are 1-D coordination polymers, in which the metal(II) ions exhibit an octahedral geometry with two suc, two nia and two aqua
ligands. The nia ligand is N-bonded, while the suc ligand bridges the metal centers through the carboxylate groups. The 1D
chains are further assembled to form 3D networks by strong N–H···O and OW–H···O hydrogen bonds. IR spectra confirm the coordination
modes of both suc and nia ligands, while TG-DTA data are in agreement with the crystal structures. Fluorescent analysis in
the solid state shows that all complexes display intraligand (π–π*) emissions of nia. 相似文献
4.
Tao Wang Feng Bao Yan Liu Bin Xing Zhe Tan Zhifang Tan Xing Qiang Lü 《Journal of Inorganic and Organometallic Polymers and Materials》2008,18(3):420-425
Abstract Two Ag+ complexes [Ag(HL)2(PF6)] (1) and [(AgL)
n
· n(CH2Cl2) · n(0.5H2O)] (2) (HL = 5-methyl-2-phenyl-4-[(2-o-tolylamino)-phenylmethylene]pyrazol-3(2H)-one) were synthesized and structurally characterized by EA analysis, IR spectra
and X-ray crystallography. The result shows that two expected coordination modes (Modes I and III in Scheme 1) of the HL ligand, can be observed in its Ag+ complexes, while not in other transition metal ions (Ni2+, Co2+ or Cu2+) complexes whether deprotonation or not for the HL ligand.
Graphical Abstract Three possible coordination modes (Modes I, II or III in Scheme 1) of the selected HL (HL = 5-methyl-2-phenyl-4-[(2-o-tolylamino)-phenylmethylene]pyrazol-3(2H)-one) ligand, can be adopted, in which Modes I and III can be observed in its two
Ag+ complexes [Ag(HL)2(PF6)](1) and [(AgL)
n
· n(CH2Cl2) · n(0.5H2O)] (2), while Mode II just observed in its transition metal ions (Cu2+, Ni2+, or Co2+) complexes, resulting from the deprotonatd form of the HL ligand and the coordination characters of transition metal ions.
相似文献
5.
?brahim Kani Yilmaz Aksu 《Journal of Inorganic and Organometallic Polymers and Materials》2010,20(1):69-77
Two new complexes, [Cd2(4-4′-bpy)2(pa)4]
n
·0.25H2O (1) (pa = phenylacetate), and [Mn(4-4′-bpy)2(pa)(H2O)3]ClO4·2H2O, (2), have been obtained from hydrothermal reaction of Cd(NO3)2·4H2O and Mn(ClO4)2·6H2O with a mixture of the ligands, 2-phenylmalonic acid (2-phmalH2) and 4-4′-bipyridine (4-4′-bpy). The pa is formed in situ by decarboxylation of phenylmalonic acid. These complexes have
been characterized by elemental analysis, FT-IR spectroscopy, thermogravimetric analysis and single-crystal X-Ray diffraction.
The Cd(II) center is seven-coordinate and linked via pa ligands to form a binuclear complex in the asymmetric unit of 1. A ladder-like 1D chain of binuclear units is formed by Cd(II)–N coordination bond through 4-4′-bpy ligands. Complex 2 consists of a mononuclear manganese center based on a distorted octahedral geometry and exhibits a supramolecular structure
containing hydrogen bonds and extensive π···π and C–H···π interactions. 相似文献
6.
Güneş Süheyla Kürkçüoğlu Okan Zafer Yeşilel İlkan Kavlak Sema Kurtaran Orhan Büyükgüngör 《Journal of Inorganic and Organometallic Polymers and Materials》2009,19(3):314-321
The heteronuclear complex, {[Cu(4(5)-Meim)4][Ni(CN)4] · H2O}n (1), (4(5)-Meim = 4(5)-methylimidazole) was synthesized and characterized by FT-IR spectroscopy, single crystal X-ray diffraction, thermal analysis
and elemental analysis. The Cu(II) ion has a distorted square planar geometry, extended to (4 + 2) weak coordination by two
nitrogen atoms of the cyano group. The coordination sphere around the Ni(II) ion should be described as a 4 + 2 geometry with
the four cyano groups and the axial coordination site is located at the imidazole ring though a weak Ni···π interaction. The
coordination bond is much stronger than the Ni···π interactions and it is expected that the formation of the coordination
bond will affect more significantly the position of the absorption bands associated with the vibrations of the ligand. In
addition, the out-of-plane modes of 4(5)-Meim are shifted to higher frequencies relative to free ligand. We propose that these shifts are indicative of the weak CH∙∙∙π
and Ni∙∙∙π interactions, according to the crystallographic and spectroscopic data. 相似文献
7.
Gholam Hossein Shahverdizadeh Ali Morsali 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(3):694-699
Nano-wires and nano-rods of a new three-dimensional cadmium(II) coordination polymer, {[Cd3(3-pyc)4(NCS)2(H2O)4]·2H2O}
n
(1); 3-Hpyc = 3-pyridinecarboxilic acid, were synthesized by a sonochemical method in two different concetrations. The morphology
of the nano-structures depend strongly on reactants’ concentration. The new nano-structures were characterized by scanning
electron microscopy, X-ray powder diffraction, elemental analyses and IR spectroscopy. Compound 1 was structurally characterized by single-crystal X-ray diffraction and is a three-dimensional polymer with two types of Cd(II)
coordination environments. 相似文献
8.
Man Jiang Yan-Tuan Li Zhi-Yong Wu Zhi-Qiang Liu Xia Wu 《Journal of Inorganic and Organometallic Polymers and Materials》2008,18(4):448-456
A new one-dimensional polymeric copper(II) complex, [Cu2(heae)(SCN)2]
n
· nH2O [H2heae is N,N′-bis(N-hydroxyethylaminoethyl)oxamide], has been synthesized and characterized by elemental analysis, molar conductivity measurement,
IR and electronic spectra studies, and single-crystal X-ray diffraction. The structure of the complex exhibits a neutral one-dimensional
polymeric copper(II) zigzag chain [Cu2(heae)(SCN)2]
n
constructed by μ-trans-heae and double μ-1,3-thiocyanate ligands. The environment about copper can be described as a square-pyramid. The neighboring second building
units (SBUs), [Cu(trans-heae)Cu]2+, are unequal with Cu···Cu separations of 5.287 and 5.273 ? for Cu1···Cu1i and Cu2···Cu2ii, respectively. The double thiocyanate ligands function as μ(1,3)-bridges to link these unequal SBUs thereby forming zigzag chains with a Cu1···Cu2 separation of 5.454 ?. The hydrogen
bonds in the crystal structure self-assemble the one-dimensional chains into a three-dimensional supramolecular structure.
The interaction of the polymeric copper(II) complex with herring sperm DNA (HS-DNA) has been investigated by using absorption and emission spectra, electrochemical techniques and viscometry. The results
reveal that the polymeric copper(II) complex interacts with HS-DNA via a groove binding mode with the intrinsic binding constant of 1.38 × 104 M−1. To the best of our knowledge, this is the first example about the structure and DNA-bonding studies of a one-dimensional
polymeric copper(II) complex that is bridged alternately by trans-oxamidate and double-thiocyanate ligands. 相似文献
9.
Lijun Song Tomokazu Iyoda 《Journal of Inorganic and Organometallic Polymers and Materials》2009,19(1):124-132
A novel ligand L, 4-(1-hydroxy-3-oxo-3-phenylpropenyl)-1-methylpyridinium was synthesized and identified by NMR spectra and X-ray single crystal
structure analysis from L · CH3SO4 (1L). Through self-assembling reactions, two new CuII/LaIII-organic complexes, [CuL2(SCN)][SCN] · H2O (2Cu) and [LaL2(SO4)Cl2] · (toluene) (3La), have been synthesized and characterized by X-ray crystallography. Structural analysis of 1L revealed that L and HSO4
− coexist in a unit cell. For 2Cu, Cu(II) ion show a five-coordinated structure with a highly compressed square pyramid configuration; For 3La, each La(III) ion has an eight-coordinated structure with a distorted capped pentagonal bipyramidal geometry. It should be
mentioned that supramolecular framework was formed via a number of hydrogen bonding interactions. Here, intramolecular C–H···O
hydrogen bonding interactions stabilized and restricted the distortion between different rings. On the contrary, intermolecular
hydrogen bond, e.g. C–H···O dual hydrogen bond interactions (1L), O5-involving triple C–H···O/O–H···O(N) hydrogen bond (2Cu) and triple C–H···Cl hydrogen bonding(3La), greatly affect geometric distortion between rings from ligand. Finally, we believe that the cooperative effect plays more
important roles in supramolecular self-assembly. 相似文献
10.
Selcuk Demir Veysel T. Yilmaz Bahtiyar Sariboga Orhan Buyukgungor Jerzy Mrozinski 《Journal of Inorganic and Organometallic Polymers and Materials》2010,20(2):220-228
Four novel divalent transitional metal succinates (suc) with nicotinamide (nia), {[M(μ-suc)(H2O)2(nia)2]·2H2O}
n
[M = Mn (1), Ni (2)], [Cu(suc)(nia)2] (3) and [Ni(H2O)4(nia)2](suc)·(H2suc) (4), have been synthesized and characterized by elemental analyses, IR and TG-DTA. X-ray analyses of 2 and 4 reveal that they crystallize in a triclinic space group P[`1]. P\bar{1}. Complex 2 is a 1-D coordination polymer, in which the metal(II) ions exhibit an octahedral geometry with two suc, two nia and two aqua
ligands. The nia ligand is N-bonded, while the suc ligand bridges the metal centres through the carboxylate groups. 4 contains the [Ni(H2O)4(nia)2]2+ complex cations, uncoordinated suc and H2suc species, which are connected into a two-dimensional layered structure by the combination of N–H⋯O and OW–H⋯O hydrogen
bonds. This is one of the scarce examples encountered in coordination chemistry, which contains uncoordinated suc and H2suc at the same time. The spectroscopic and structural analysis, luminescent and magnetic properties and the antimicrobial
activities of the synthesized complexes were investigated. 相似文献
11.
Cao-Yuan Niu Zhen-Liang Pan Yu-Li Dang Chao-Ling Feng Chun-Hong Kou 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(3):611-618
Bilayered diffusion and hydrothermal synthetic methods using pyridine (py) and 2,6-dimethylpyrazine (dmpz) as weak bases and
small terminal ligands generated two Cd(II) and Co(II) 1D coordination polymers with dinuclear metal clusters as secondary
building units (SBUs) from an organic bridging ligand, 1,1′-biphenyl-3,3′-dicarboxylic acid (H2
L). They are {[Cd2(L)2(py)4] (py)(CH3OH)}
n
(1) and [Co2(L)2(dmpz)4(H2O)]
n
(2). Compounds 1 crystallizes in the monoclinic space group P2(1)/c, while 2 crystallizes in the triclinic space group P-1. Especially, compound 2 possesses the 1D chain structure that contains two linked left-handed and right-handed helices. Fluorescent measurements
for 1 display strong blue light emissions with the maximum emission at 396 nm with the excitation of 320 nm. Magnetization study
shows the existence of weak antiferromagnetic coupling for 1 with the negative −E
2/k value of −1.3 K. 相似文献
12.
Guang-Xiang Liu Xiao-Chun Zha Yan Wang Sadafumi Nishihara Xiao-Ming Ren 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(1):201-206
Abstract
A new chiral Cu(II) complex, Cu3(phen)3(H2O)(BTA)2·13H2O (1) (H3BTA = benzene-1,3,5-triacetate acid and phen = phenanthroline) has been prepared by solvothermal synthesis and structurally characterized by IR, elemental analysis, and single crystal X-ray diffraction. This complex crystallizes in the chiral space group C2 and has similar one-dimensional chains, which are further bridged by μ 2-H2O to form a two-dimensional layer structure. The nonlinear optical property and magnetic property were investigated. 相似文献13.
Shu-Lin Ma Shi Ren Yun Yang 《Journal of Inorganic and Organometallic Polymers and Materials》2010,20(1):104-109
Two new complexes, [M2(L)2(bpy)2](ClO4)2 [L = methyl salicylate, bpy = 2,2′-bipyridine, M = Cu (1) and Zn (2)] have been synthesized and structurally characterized by X-ray structure analyses. The centrosymmetric dimeric structure
consists of a binuclear unit, in which M (M = Cu or Zn) atoms are bridged by two phenol oxygen atoms as a μ
2-bridged. The neighboring binuclear units interact with each other by two kinds of weak contacts: one kind is π–π stacking
by π–σ attraction with an edge-to-face C–H···π interaction, and the second type is a H-bonding interaction, which extends
the binuclear unit into a 3D network. Magnetic measurements confirm that 1 presents a very strong intradinuclear ferromagnetic coupling between the copper(II) ions. 相似文献
14.
Alexander Trujillo Sourisak Sinbandhit Loïc Toupet David Carrillo Carolina Manzur Jean-René Hamon 《Journal of Inorganic and Organometallic Polymers and Materials》2008,18(1):81-99
The synthesis of neutral dinuclear iron–nickel unsymmetrical Schiff base complexes 3 and 4 was achieved via a template reaction involving equimolar amounts of alkyl or aryl “half-unit” precursors, respectively, Fc–C(O)CH=C(CH3)N(H)R (1: R = CH2CH2NH2; 2: R = o-C6H4NH2; Fc = CpFe(η5-C5H4); Cp = η5-C5H5), 5-bromosalicylaldehyde and nickel(II) acetate tetrahydrate in a refluxing CH2Cl2/MeOH (1:1) mixture. The ionic trinuclear unsymmetrical complex 5 was prepared by reacting its dinuclear precursor 3 with the arenophile source, [Cp*Ru(NCCH3)3]PF6 (Cp* = η5-C5(CH3)5), in refluxing CH2Cl2 for 2 h, whereas the trinuclear species 6 was formed upon regioselective π-complexation of the 5-bromosalicylidene ring of 4 by [Cp*Ru]+ at room temperature overnight. All the new compounds were adequately characterized by analytical and spectroscopic techniques
and, in addition, the crystal and molecular structures of the “half-unit” 1, the binuclear complex 4 and its hemisolvate adduct 4 · 0.5CH3OH, the trinuclear Schiff base compound 5 · 2(CH3)2CO, and the mixed sandwich metalloligand 7 have been determined by X-ray crystallography. Both organometallic–inorganic hybrids 5 and 6 contain the neutral electron-releasing ferrocenyl group, and the cationic electron-withdrawing ruthenium mixed sandwich,
linked through the unsymmetrical tetradentate Schiff base complex {Ni(ONNO)}. UV–vis, 1H and 13C NMR as well as electrochemical data clearly indicate a mutual donor–acceptor electronic influence between the organometallic
termini. Furthermore, X-ray crystal structure analysis of 5 · 2(CH3)2CO reveals the partial delocalization of bonding electron density throughout the dinucleating nickel Schiff base ligand.
Dedicated to Prof. Didier Astruc, a true friend, an outstanding lecturer and scientist, in honor of his pioneering research
efforts and accomplishments in the fields of organometallic chemistry, dendrimers and their applications in nanocatalysis. 相似文献
15.
Yan-Ju Huang Liang Ni 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(1):97-102
Two 3D coordination polymers, [Cd(BDC)(Medpq)·H2O]n
1, and [Co(BDC)(Medpq)·H2O]
n
2 (BDC = terephthalic acid, Medpq = 2-Methyldipyrido[3,2-f:2′,3′-h]quinoxaline), have been synthesized by self-assembly. The
structure analyses show that both of the two coordination polymers are formed by 1D infinite chains through non-covalent interactions,
and both of them are based on 1D zigzag ones. The photoluminescent study of the coordination polymer [Cd(BDC)(Medpq)·H2O]
n
shows that it exhibit fluorescent emission bands at 567.7 nm. 相似文献
16.
Chunlin Ma Qianli Li Rufen Zhang 《Journal of Inorganic and Organometallic Polymers and Materials》2009,19(2):208-214
Three types of di- and trimethyltin(IV) polymers [Me2Sn(C9H4N2O4)]n · 4H2O 1, [(Me3Sn)2(C9H4N2O4)]n · H2O 2 and [(Me3Sn)2(C9H4N2O4)]n · CH3OH 3 have been synthesized by the reaction of trimethyltin chloride with benzimidazole-5,6-dicarboxylic acid under three different
experimental conditions. All the complexes were characterized by elemental analysis, IR, NMR (1H, 13C, 119Sn) spectroscopy and X-ray crystallography diffraction analysis. The structure analyses reveal that complex 1 has a 1D helical chain in which benzimidazole-5,6-dicarboxylic acid act as a tetradentate (O,O-chelation) ligand coordinating to dimethyltin (IV) ions, two water molecules take part in the coordination giving seven-coordinated
tin centers in the component. Complex 2 and 3 are 2D and 3D corrugated polymers in which the deprotoned acid as tetradentate ligand affords by three oxygen atoms and a
nitrogen atom. 相似文献
17.
Lei Li Shuyun Niu Zhongfeng Shi Hanqing Wu Wenting Zhu Jing Jin Yuxian Chi Yongheng Xing 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(1):15-24
Three chromium(III) coordination supramolecules, [CrQ2(H2O)Cl]·H2O 1, [Cr(Pic)2(phen)]·NO3·2.5H2O 2, [Cr(ATA)(phen)]·CH3OH·3H2O 3 (HQ = Quinoline 2-acid, HPic = Picolinic 2-acid, H3ATA = Ammonia triacetic acid, phen = 1,10-Phenanthroline), have been synthesized solvothermally and characterized by single-crystal
X-ray diffraction, IR spectra, UV-Vis absorption spectra and elemental analysis. The surface electron behavior of chromium
complexes have been studied emphatically by surface photovoltage spectroscopy (SPS). Structural analyses indicate that the
three complexes are all molecular complexes with the ligands of carboxylate groups; and, they are further connected into supramolecules
by hydrogen bonds and π–π interactions. The results of SPS show that there are positive photovoltage response bands within
300–800 nm, which indicate that they all possess obvious photoelectric conversion properties. Energy-band theory for semiconductors
and crystal field theory have been combined to analyze and assign the SPS bands. There are three types of band-to-band transitions
in the SPS of the complexes; i.e., LMCT bands for Cl → Cr, O → Cr, N → Cr. The similarities and differences between the SPS
and UV-Vis absorption spectra for the three complexes were compared and reasonably explained. There was a good correlation
between the SPS and UV-Vis absorption spectra. 相似文献
18.
Hakan Erer Okan Zafer Ye?ilel Orhan Büyükgüng?r 《Journal of Inorganic and Organometallic Polymers and Materials》2010,20(4):774-782
Three M(II)-squarate complexes, [Co(sq)(H2O)(Nmim)4] (1), [Zn(μ1,3-sq)(H2O)2 (Nmim)2]
n
(2) and [Cd(μ1,3-sq)(H2O)2(Nmim)2]
n
(3) (sq = squarate, Nmim = N-methylimidazole) have been synthesized and characterized by elemental, spectral (IR and UV–Vis.) and thermal analyses. The
molecular structures of the complexes have been investigated by single crystal X-ray diffraction technique. The squarate ligand
acts as two different coordination modes as a monodentate (in 1) and bis(monodentate) (O
1–
O
3
) bridging ligand (in 2, 3). The Co(II) atom has a distorted octahedral geometry with the basal plane comprised of three nitrogen
atoms of Nmim ligands and a oxygen atom of squarate ligand. The axial position is occupied by a nitrogen atom of Nmim and
one aqua ligand. The crystallographic analysis reveals that the crystal structures of 2 and 3 are one-dimensional linear chain
polymers along the c and b axis, respectively. The configuration around each metal(II) ions are distorted octahedral geometry
with two nitrogen atoms of trans-Nmim, two aqua ligands and two oxygen atoms of squarate-O1,O3 ligand. These chains are held together by the C–H···π, π···π and hydrogen-bonding interactions, forming three-dimensional network. 相似文献
19.
Yang Zou Yi-Zhi Jiang 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(1):165-170
Ligand L (H3L = Glycylglycine, N-[1-(2-hydroxy,5-bromophenyl)propylidene]) has been prepared which contain flexible dipeptide group and substituted phenol
group. The ligand react with Cu(NO3)2 to give the metallo-ligand [CuL]−, in which L acting as quadridentate ONNO chelate, coordinate to Cu(II) ion. The metallo-ligand [CuL]− is rigid and has multifunctional groups. Reaction of metallo-ligand with Sr(NO3)2 leads to the formation of the title complexes [Sr(H2O)4(CuL)2]· (CuL)·2.25H2O (1). This heteronuclear compound has been characterized by elemental analyses, spectroscopic analyses, and single crystal diffraction.
Structural analyses reveal that the complex was crystallized in triclinic space group P-1 and has intricate 2D net-structure, which contain an infinite 1D [Sr(H2O)4(CuL)2]+ ladder-like structure. In addition ESR (electron spin resonance) property and thermogravimetric analysis of 1 are discussed in detail. 相似文献
20.
Ahmet Bulut ?brahim U?ar Tolgay Kalyoncu Yusuf Yerli Orhan Büyükgüng?r 《Journal of Inorganic and Organometallic Polymers and Materials》2010,20(4):793-801
Three novel one-dimensional (1D) coordination polymers with general formula {[M(μ-sq)2(amp)2]·H2O}n [M=Cu(II) (1), Zn(II) (2)] and [Cd(μ-sq)2(amp)2]n (3) [sq: Squarate; amp:2-aminomethylpyridine] have been prepared and spectroscopically studied. Each metal (II) ion in 1–3 is octahedrally coordinated by two sq and two amp ligands. The amp ligands are N,N′ coordinated, while the sq ligands bridge the metal centers forming 1D linear chain structure. The individual chains are linked by O–H···O hydrogen bonds involving the hydrogens of water molecules
(1–2), amino hydrogens and squarate O atoms (1–3). The hydrogen bonded layers are further assembled into three-dimensional supramolecular networks by weak aromatic π–π interactions.
EPR results indicate that the ground state of the paramagnetic electron in 1 and Cu2+ doped complexes 2–3 is dx2 - y2 d_{{x^{2} - y^{2} }} . Magnetic measurements reveal that complex 1 shows paramagnetic behavior. 相似文献