Synthesis and characterization of a novel 2D zinc(II) coordination polymer

Under hydrothermal conditions, NaN₃, 4-[²H₇]methylbenzonitrile, reacted with Zn(NO₃)₂ to give a 2D layered network complex [Zn(4-MPTZ-[²H₇])₂] (1) [4-MPTZ = 5-(4-methylphenyl)tetrazole]. Single crystal X-ray determination shows that complex 1 consists of two Zn atoms and six tetrazolyl ligands in the crystallographically asymmetric unit with orthorhombic space group Pbcn, each Zn center is linked to three other Zn centers through the bridging ligands. And the dielectric constants of 1 were measured at different temperature, and deuterated effect at the lowest frequency (10⁴ Hz) can be estimated to increase 33% at 290 K which was never seen before in the isotope effect.     

Synthesis and crystal structure of a novel zinc(II) coordination polymer with mixed ferrocenyl diketone and bipyridine ligands

A novel zinc(II) coordination polymer [Zn(fca)₂(bpe)]_n·2nH₂O (bpe=1,2-bis(4-pyridyl)ethene, fca=C₅H₅FeC₅H₄C(OH)CHCOCH₃) was obtained by the reaction of Zn(OAc)₂·2H₂O with bpe and 1-ferrocenylbutane-1,3-dione (ferrocenoylacetone, Hfca) in methanol solution. X-ray structural analysis reveals that the compound contains two kinds of ligands: one is the 1,2-bis(4-pyridyl)ethene ligand, directly bridging zinc(II) centers to form a one-dimensional chain [Zn(bpe)]_n, the other is the enolized ferrocenylacetone chelating the central ion. The zinc(II) ion is in an elongated octahedral environment with four oxygen atoms from two distinct enolized ferrocenoylacetone, two nitrogen atoms of the bridging 1,2-bis(4-pyridyl)ethene ligands.     

Synthesis, characterization and luminescent property of a novel zinc(II) 1,2,3,4-tetra(4-pyridyl)thiophene metal–organic framework

A novel metal–organic framework (MOF) [Zn(TPT)(MPDCO)(H₂O)·H₂O]n (TPT = 1,2,3,4-tetra (4-pyridyl)thiophene, MPDCO = 6-methylpyridine-2,4-dicarboxylic acid N-oxide) (1) was obtained via hydrothermal synthesis and characterized by the elemental analysis, IR spectroscopy, TG analysis, luminescent spectroscopy and single-crystal X-ray diffraction analysis. Single-crystal structural analysis reveals that a one-dimensional (1-D) ladderlike MOF is constructed through the mixed ligands, and it is further connected by the intermolecular hydrogen bonds to form a 3-D supramolecular network. Complex 1 exhibits efficient blue luminescence at room temperature, and the framework is stable below 235 °C.     

Synthesis,characterization and application of a novel nanometer-sized chelating resin for removal of Cu(II), Co(II) and Ni(II) ions from aqueous solutions

A novel nanometer-sized chelating resin (NSCR) was prepared via two steps, First step: copolymerization reaction of N-methacryloxyphtalimide (NMP) with methylenebisacrylamide (MBA) by suspension polymerization method to give ultrafine poly (NMP-co-MBA). Second step: reaction of triethylenetetramine (TETA) with poly (NMP-co-MBA) to give NSCR. The prepared NSCR was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Brunauer-Emmett-Taller (BET) and thermogravimetric analysis (TGA). This study illustrated the capability of NSCR for extraction of Cu(II), Co(II) and Ni(II) from aquatic solutions. The pH effect, metal ions concentration, temperature and contact time were elaborated in batch experiments. The results showed that high capacities were 1.3, 1.0 and 0.95 mmol/g resin for Cu(II), Ni(II) and Co(II) ions, respectively. The experimental data of adsorption isotherms were convenient for Langmuir isotherm, and the kinetic data illustrated that the removal process was described by pseudo-second order kinetic model. The parameters of Thermo dynamic illustrated that the process of adsorption was endothermic and spontaneous reaction. The prepared NSCR was regenerated and used repetitively for five times with small decrease in adsorption capacity.     

Synthesis,characterization, and application for addition polymerization of norbornene of novel acetylacetonate bis(anilines) palladium (II) complexes

New acetylacetonate bis(aniline) palladium (II) complexes were synthesized by nitrile substitution of [Pd(acac)(MeCN)₂]BF₄ with L (L = o-toluidine, p-toluidine, 2,6-dimethylaniline, 2,6-diisopropylaniline) which yielded [Pd(acac)(L)₂]BF₄ as a mononuclear species with chelating acac ligand. Preliminary investigations into the polymerization of norbornene in the presence of BF₃·OEt₂ were performed. An X-ray diffraction study of [Pd(acac){NH₂(2,6-Me₂C₆H₃)}₂]BF₄ establishes the presence of hydrogen bonding between the 2,6-dimethylaniline ligand and [BF₄]⁻ anion.     

Synthesis,structure, and luminescence of a novel lead(II) coordination polymer with 1,2-phenylenediacetic acid

A coordination polymer [Pb₂(phda)₂]_n (H₂phda = 1,2-phenylenediacetic acid) was synthesized and characterized by single crystal X-ray diffraction. The complex has a (6, 6)-connected 2D framework with topology of (4¹⁵), in which Pb²⁺…π interaction is observed. The 2D framework is further assembled by C–H…π interactions, resulting in a 3D supramolecular network. The fluorescence of the complex is assigned to the intraligand π^?–π transition and the ligand-to-metal charge transfer.     

Synthesis, characterization and crystal structure of a novel thiocyanate–ruthenium(II) complex

The cis-[Ru(dppb)(Me-bipy)(NCS)₂], dppb = 1,4-bis (diphenylphosphino)butane, Me-bipy = 4,4′-dimethyl-2,2′-bipyridine, and NCS = thiocyanate, was synthesized and characterized by spectroscopic and electrochemical techniques and its structure was determined by crystal X-ray analysis. The crystal structure reveals that the coordination geometry around the Ru(II) center is distorted octahedron where two molecules of thiocyanate are bonded to the ruthenium through nitrogen atom in cis orientation. The half-wave formal potential value E_1/2 = 0.8 V (versus Ag/AgCl) observed is considerable higher than that for the cis-[RuCl₂(dppb)(Me-bipy)] complex, E_1/2 = 0.6 V (versus Ag/AgCl), well illustrating the strong π-acceptor effect the NCS ligand toward the backbonding interaction with the Ru(II) metal center. The MLCT absorption bands of the thiocyanate complex present a higher molar absorptivity (about 12%) compared with the cis-[RuCl₂(dppb)(Me-bipy)] complex, in the same experimental conditions. These properties make the complex potentially promising for the photosensitization process.     

一种新型共轭Schiff碱聚合物的合成与表征

以对苯二甲醛和水合肼为原料,无水乙醇作溶剂合成了一种共轭Schiff碱聚合物,并通过GPC、IR、1 H NMR、紫外-可见吸收光谱和荧光光谱对其分子量和组成结构进行表征。结果表明,该物质为一种分子量较大的共轭Schiff碱聚合物,具有良好的荧光性。     

Synthesis and characterization of a novel highly phosphonated water-insoluble polymer

A novel polymer, functionalized by tetrafluoroaryl phosphonic acid units, was prepared by free-radical polymerization of the corresponding styrene monomer. The obtained polymer was analyzed by gel permeation chromatography, differential scanning calorimetry, and spectroscopy (NMR, IR). Ion exchange capacity of the water-insoluble polymer was determined in methanol solution by titration with 0.1M NaOH. The proton conductivity of the polymer of 9.91 × 10⁻⁷ S cm⁻¹ as disclosed by electrochemical impedance spectroscopy renders this polymer a promising candidate for solid electrolyte applications or as a water-insoluble dopant for proton exchange membrane applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48235.     

A novel two-dimensional chiral coordination polymer: bis(S-(-)-lactate)zinc(II)

The synthesis and X-ray characterization of a novel chiral two-dimensional condensed metal–organic coordination polymer, bis(S-(-)-lactate)zinc(II) (1), are reported. Its crystal structure determination shows that a chiral cavity with approximate dimensions of 5.4×5.4 Ų is present. Crystallographic data for 1, C₆H₁₀O₆Zn, monoclinic P2₁, a=7.4440(15), b=7.4550(15), c=7.4550(15) Å, β=95.73(3)°, V=429.48(15) ų, R₁=0.0272, wR₂=0.0751.     

Synthesis,structure, photoluminescence and theoretical calculation on a novel Zn(II) coordination polymer with (4,8)-connected topology

A new compound, namely [Zn₂(pbdc)_1.5(TAZ)]_n 2nH₂O (1 H₂pbdc = terephthalic acid, HTAZ = 1H-1,2,4-triazole), has been hydrothermally synthesized from H₂pbdc, HTAZ and Cd(II) salts. Single crystal X-ray diffraction analysis reveals that compound 1 represents an unprecedented (4,8)-connected 3D topological network. Notably, two TAZ ligands in uniform μ₃-1,2,4 bridging mode connect four Zn(II) ions together, giving rise to a [Zn₄(TAZ)₂] metallo-ligand subunit, which are further bridged via pbdc ligands in two kinds of coordination modes, resulting in the final 3D complicated framework. The relevant density of states (DOS) calculation result showed that the luminescence of 1 mainly originates from HTAZ intraligand charge transition.     

Synthesis,spectroscopic properties and DFT calculations of a novel multipolar azo dye and its zinc(II) complex

The synthesis and photophysical properties of 5-(diethylamino)-4-[(E)-(4-nitrophenyl)diazenyl]-2-(1,3-benzoxazol-2-yl)phenol (AB-HBO) and its zinc complex were examined. The organic molecule acts as a pH sensitive chromophore and as mononegative ligand for zinc(II) ion. Structural features and photophysical properties of AB-HBO were studied. The solvatochromic blue shift, shown by the ligand in its neutral form, is widely enhanced in its deprotonated form. The color solution ranges from red-orange to violet and blue-green as function of the electronic density deformation. Fluorescence spectra were recorded on both ligand and zinc complex solutions. (TD)DFT calculations have been performed to rationalize the absorbance of chromophore and complex.     

新型salamo衍生物苦味酸铜(Ⅱ)配合物的合成与表征

以丙酮为溶剂,1,3-二胺氧丙烷双缩邻香草醛(H2L)与苦味酸铜反应,制备了一种新型salamo衍生物苦味酸铜(Ⅱ)配合物,其结构经元素分析,1HNMR,IR,TG-DTA及UV表征。结果表明,新型salamo衍生物是一种四齿配体,配合物的可能结构式为[Cu4L2(pic)4(H2O)2].2CH3COCH3.2H2O。     

水杨醛缩4-氨基安替比林与Zn(II),Ni(II),Co(II)配合物的合成和表征

以水杨醛、4-氨基安替比林和醋酸盐为原料,在酸性条件下,以乙醇为溶剂,合成了水杨醛缩4-氨基安替比林希夫碱及其配合物。考察了反应时间、温度、原料配比对该合成的影响。结果表明,反应的最佳条件为:水杨醛∶4-氨基安替比林∶醋酸盐(摩尔比)=1∶1∶1,在80℃条件下反应5 h,产率可达80%。通过红外和紫外光谱进行表征,研究了他们的性质。     

Synthesis, electrochemical, and photophysical studies of hexadecachlorinatedphthalocyaninato zinc(II)

Synthesis of a new symmetrical 1,4,8,11,15,18,22,25-octahexyloxy-2,3,9,10,16,17,23,24-octa-(3,5-dichlorophenyl)phthalocyaninato zinc(II), ZnPc, has been described and characterized by ¹H NMR, ¹³C NMR, MS, UV-Vis, and IR spectrometry. The newly prepared ZnPc is soluble in organic solvents and is not aggregated in solution. The photophysical properties were studied by steady-state absorption and emission, cyclic voltammetry, and nanosecond transient absorption techniques. The prepared ZnPc absorbs and emits at longer wavelengths compared to that of reported phthalocyanine derivatives. The electron-donating properties of the ZnPc have been examined by mixing it with the electron-accepting dicyanoperylene-3,4,9,10-bis(dicarboximide), PDICN₂. The recorded nanosecond transient spectra in the visible/near-IR region showed clearly the electron-transfer from the triplet-excited state of the ZnPc to PDICN₂ with a rate of 3.40 × 10⁸ M⁻¹ s⁻¹. Light absorption in a wide section of the solar spectrum, favorable redox properties, and the electron-transfer properties suggest usefulness of the ZnPc in light-energy harvesting and developing optoelectronic devices.     

A novel terpyridyl rhenium(II) complex – Synthesis,spectroscopic characterization and X-ray structure

The reaction of the [ReOBr₃(PPh₃)₂] complex with 2,2′:6′,2″-terpyridine (terpy) in the presence of tripenylphosphine has been examined and novel [ReBr(terpy)(PPh₃)₂]ReO₄ · H₂O · CH₃OH complex – has been obtained. It has been studied by IR, UV–vis spectroscopy and X-ray crystallography.     

Synthesis and characterization of a novel 3D copper(I) coordination polymer with a ligand generated in situ

Hydrothermal reaction of CuCl₂ · 2H₂O, NaN₃ with 1,4-dicyanobenzene in water/ethanol yielded a novel Cu(I)-tetrazolate, {Cu(cptz)}_n, (1) (Hcptz is 5-(4-cyanophenyl)-tetrazole). The cptz ligand in the complex was generated in situ through the [2 + 3] cycloaddition reaction involving one of the two cyano-groups of the precursor 1,4-dicyanobenzene. The structure characterization shows that 1 possesses a 3D 4-connected SrAl₂ topological network. Additionally, complex 1 exhibits strong yellow fluorescence at room temperature in the solid state.     

A novel solid polymer electrolyte: Synthesis and characterization

Summary A new polyether network was prepared using a polyethylene oxide (PEO) triol and a PEO diisocyanate, the latter component arising from the chemical modification of commercial PEO diamines. The physico-chemical properties of the network alone and with LiClO₄ were assessed in comparison with those of previously obtained structures. Ionic conductivities were found to be higher with this new system. Replacement of LiClO₄ by LiN(CF₃SO₂)₂ improved the conductivity further because of the plasticizing role of the imidic anion.