共查询到20条相似文献,搜索用时 14 毫秒
1.
Xiao-Ming Lin Yin Ying Li Chen Hua-Cai Fang Zheng-Yuan Zhou Qing-Guang Zhan Yue-Peng Cai 《Inorganic chemistry communications》2009,12(4):316-320
Three 4d–4f heterometallic polymers, Ln2Ag2(Hpydc)2(pydc)2(ox) · 4H2O (Ln = Nd (1), Eu (2) and Er (3); H2Pydc = pyridine-3,5-dicarboxylic acid, H2ox = oxalic acid), have been successfully synthesized under hydrothermal condition and structurally characterized. Single-crystal X-ray diffraction analyses reveal that three compounds are isomorphous and exhibit 3D pillar-layered coordination frameworks constructed from two-dimensional lanthanide-carboxylate layers and [Ag(pydc)]? pillars. Furthermore, the luminescent property of compound 2 was studied. 相似文献
2.
《Inorganic chemistry communications》2008,11(11):1409-1411
The self-assembly of nicotinic acid and sodium oxalate with mixed 3d–4f metal salts under hydrothermal conditions gave three isostructural 3D 3d–4f coordination polymers, [LnCu(nic)2(ox)] · xH2O [Ln = La, x = 1 (1); Ln = Eu, x = 2 (2); Ln = Gd, x = 2 (3)] [ox = oxalate, nic = nicotinate]. All three structures exhibit same unusual 3D microporous heterometallic coordination frameworks that are built up by rare tetranuclear Ln2Cu2 clusters and mixed ox and nic linkers. Furthermore, the luminescent property of complex 2 has also been investigated. 相似文献
3.
Zhao-Yang Li Jing-Wei Dai Hui-Hua Qiu Shan-Tang Yue Ying-Liang Liu 《Inorganic chemistry communications》2010,13(3):452-455
One new three-dimensional 3d–4f heterometallic coordination polymer, namely, {[EuZn2(imdc)2(C2O4)0.5(H2O)4]·2H2O}n (1) (H3imdc = imidazole-4,5-dicarboxylic acid), has been successfully synthesized by the hydrothermal reactions of Eu2O3, Zn(NO3)2·6H2O, H3imdc, H2C2O4·2H2O and H2O. Single-crystal X-ray diffraction analysis reveals that complex 1 possesses 3D heterometallic framework containing 2D layer based on L–Zn2–L (L = imdc) helical chains and L–EuZn1–L chains. Complex 1 exhibits unprecedented (3,4)-connected four-nodal topology with Schläfli symbol (6·7·8) (6·7·9) (6·72·82·10) (7·82). Moreover, the photoluminescence property of 1 was investigated in the solid-state at room temperature. 相似文献
4.
Qi Zhang Yong-Xin Zheng Chen-Xu Liu Ya-Guang Sun En-Jun Gao 《Inorganic chemistry communications》2009,12(6):523-526
Heterometallic coordination polymers of the form {[SmMn2(imdc)2(OAc)(H2O)]·2H2O}n (1) (H3imdc = 4,5-imidazoledicarboxylic acid, HOAc = acetic acid) were hydrothermally synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction. The results reveal that 1 has a three-dimensional framework containing Sm2Mn4 clusters. The luminescence and magnetic properties of 1 were also investigated. 相似文献
5.
Guo Peng Li Ma Biao Liu Jin-Biao Cai Hong Deng 《Inorganic chemistry communications》2010,13(5):599-602
Three novel Ln(III)–Cu(I) coordination polymers, namely [LnCu(Hbic)3(ox)0.5] [Ln = Sm (1), Dy (2), Hbic = benzimidazole-5-carboxylate, ox = oxalate] and [EuCu(Hbic)2(ox)H2O]·2H2O (3) have been hydrothermally synthesized and stucturally characterized. Both complexes 1 and 2 display the same unusual 2D layer heterometallic coordination frameworks that are built up by dimeric [Ln2(Hbic)6] cores and oxalate ligands by sharing Cu(I) ions. Complex 3 represents 1D polymeric chain architecture constructed from Eu2Cu2 ring units and oxalate ligands. Furthermore, the luminescent property of complex 3 has also been investigated. 相似文献
6.
Two novel Ln–Ag coordination compounds with the formula [LnAg2(IN)4(OAC) · 5H2O] · 2H2O (Ln = Gd 1, Eu 2; HIN = isonicotinic acid; HOAC = acetic acid) have been synthesized under hydrothermal condition and characterized by single-crystal X-ray diffraction, thermal analysis, IR absorption spectroscopy, ultraviolet excitation and emission spectrum. The two compounds show isostructural architectures and exhibit an unusual 1-D structure, which is formed by the linkages of Ag–Ag. 相似文献
7.
Wen-Bin Sun Peng-Fei Yan Guang-Ming Li Ju-Wen Zhang Ting Gao Masayuki Suda Yasuaki Einaga 《Inorganic chemistry communications》2010,13(1):171-174
Three one-dimensional (1D) heterospin trimetallic chain-like polymers [{LCu(H2O)}Ln(MeOH)(H2O)2{(μ-CN)2Fe(CN)4}]·2H2O (1, Ln = La; 2, Ln = Nd; 3, Ln = Gd) were prepared by substitution of the nitrato ligands in [LCuLn] complexes with [Fe(CN)6]3? ions (H2L = N,N′-bis(3-methoxysalicylidene)propane-1,2-diamine). Single-crystal X-ray diffraction analysis revealed that the methyl on the salen-type ligand impeded the connection between cyanide groups and Cu(II) ions efficiently. Consequently, three novel one-dimensional (1D) trimetallic chain-like polymers were obtained with the linker [Fe(CN)6]3? ions interacting only with the lanthanide ions. The magnetic investigation for 3 indicated a ferrimagnetic chain may form. 相似文献
8.
A series of unusual three-dimensional (3D) 3d–4f cyanide heterometallic coordination polymers (HCPs), namely [Ln1.5Cu3(ina)3(ga)(CN)1.5(X)(H2O)] [Ln = Dy, X = Cl (1), Ln = Tb, X = Br (2), Ln = Dy, X = Br (3); ina = isonicotinic acid; ga = glycolic acid] have been synthesized via hydrothermal reaction and characterized by single crystal X-ray diffraction, elemental analyses, FT–IR spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). X-ray structural analysis reveals that HCPs 1 to 3 are constructed from the linkage between Ln–organic layer motifs and double-stranded cyano-containing Cu-inorganic ribbon motifs. In these complexes, the carboxyl group and hydroxyl group of H2ga are all deprotonated and the coordinated ga ligands adopt a very interesting μ3-kO:kO,O′:kO′,O″ coordination mode. Moreover, magnetic properties of HCP 1 were investigated. 相似文献
9.
Ming-xing Yang Shen Lin Li-juan Chen Xiao-feng Zhang Hui-hong Xu 《Inorganic chemistry communications》2009,12(6):566-568
A novel organic–inorganic hybrid compounds containing 12-tungstovanadate and 3d–4d heterometallic complex, [V1W12O40][VO2Ag(phen)3]2 (1), have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction and IR analysis. The complex is an uncommon bisupporting polyoxometalate derivative in which the saturated Keggin type polyoxoanions are covalently linked by bimetallic complex [VO2Ag(phen)3]2+. The neighboring Ag+ and V5+ cations are bridged by the oxo atom forming heterometallic cations with the Ag–V distances of 3.556(2) Å in [VO2Ag(phen)3]2+ cations. Furthermore, the title compound shows good photocatalytic activity for reduction of Rhodamine B (RB) in a liquid–solid system. 相似文献
10.
The synthesis of side-chain liquid crystalline polysiloxanes containing (S)-2-methylbutyl-4-alkyloxybiphenyl and (2S, 3S)-2-chloro-3-methylpentyl 4-alkyloxybiphenyl-4-carboxylate moieties as mesogenic units and aliphatic spacers containing respectively three to eleven methylene units is presented. Differential scanning calorimetry, optical polarizing microscopy and X-ray diffraction measurements reveal chiral smectic mesomorphism for most of the obtained polymers. Two polysiloxanes that contain respectively three methylene units in their spacers exhibit an enantiotropic smectic A phase or no mesophase. Four polysiloxanes that contain respectively five, six and eleven methylene units in their spacers exhibit enantiotropic smectic A and chiral smectic C phases. The results seem to demonstrate that the tendency toward chiral smectic C mesomorphism increases with increasing spacer length. Incorporation of a chloro-containing chiral end group into the mesogenic core of a polymer will decrease the thermal stability of the mesophase formed. 相似文献
11.
A novel one-dimensional helical mixed-valence cobalt coordination polymer (1) {[CoIICoIII(HL)2(OAc)]·CH3OH·H2O}n, (H3L = 2-ethyl-2-((2-hydroxynaphthalen-1-yl)methyleneamino)propane-1,3-diol) has been synthesized and characterized. Single-crystal X-ray diffraction analyses reveal that complex 1 crystallizes in the tetragonal I4(1)/a space group. It consists of a bimetallic CoIICoIII(μ2-O)2 core, and the adjacent CoII(2) centers are sequentially bridged by carboxylate groups in the syn–anti fashion, affording to a one-dimensional infinite helical chain along the c-axis. Adjacent chains are stacked via CH···π interactions to form the overall three-dimensional supramolecular networks. Magnetic and in vitro anticancer activities of the complex have been investigated in detail. 相似文献
12.
13.
《Journal of the European Ceramic Society》2020,40(12):3989-3995
Two garnet-structured microwave dielectric ceramics of A3Y2Ge3O12 (A = Ca, Mg; called CYG and MYG, respectively) were synthesized. CYG was crystallized in a normal cubic garnet structure with Ca2+ fully occupying the dodecahedral (A) site, whereas MYG was an inverse garnet with mixed distribution of Mg2+/Y3+ at the A site. The difference in ionic occupation resulted in anomalies in microwave dielectric properties, with dielectric constant (εr) = 14.1, quality factor (Q × f) = 12,600 GHz and positive temperature coefficient of resonant frequency (τf) =120.5 ppm/°C for MYG ceramic and εr = 10.8, Q × f = 97,126 GHz and τf = −40.6 ppm/°C for CYG ceramic. The large deviations in measured εr from theoretical εth possibly resulted from the garnet structural constraints leading to ‘rattling’ Mg2+ and Y3+ in A site of MYG. Infrared reflectivity spectra analysis revealed ion polarization contributed mostly to the permittivity of both ceramics in microwave frequency ranges. 相似文献
14.
Di Sun Geng-Geng Luo Na Zhang Qin-Juan Xu Cheng-Feng Yang Zhan-Hua Wei Yi-Chang Jin Li-Rong Lin Rong-Bin Huang Lan-Sun Zheng 《Inorganic chemistry communications》2010,13(2):290-293
The unprecedented μ3- and μ4-bonding modes of NH2pyz (NH2pyz = 2-aminopyrazine) are observed for the first time in a novel 3D Ag(I) coordination polymer [Ag7(NHpyz)6(ClO4)]n (1) which was obtained by reaction of Ag2O, NH2pyz and NaClO4 in H2O/CH3OH/NH3 media under ultrasonic treatment. Compound 1 is a 3D framework with infinite 1D Ag belts incorporating diverse Ag···Ag interactions. Moreover, 1 exhibits photoluminescence maximized at 494 nm upon 300 nm excitation at room temperature, which may be mainly assigned to ligand-to-metal charge transfer (LMCT) mixed with metal-centered (d-s/d-p) transitions. Semiconducting behavior of 1 was also measured at room temperature with σ value of 6.78 × 10?6 S cm?1. 相似文献
15.
A class of 3s–5d–4f mixed metal substituted sandwich-type arsenotungstates [H2N(CH3)2]8H3[LnNa(H2O)4(OH)WO(H2O) (B-α-AsW9 O33)2]·8H2O [Ln = LaIII (1), CeIII (2), PrIII (3)] have been isolated from an aqueous solution reaction system (pH = 4) of Na2WO4·2H2O, C2H7N·HCl, NaAsO2 and Ln(NO3)3·6H2O and structurally characterized by elemental analyses, IR spectra, UV spectra and single-crystal X-ray diffraction. It is the most prominent in 1–3 that the [LnNa(H2O)4(OH) WO(H2O)(B-α-AsW9O33)2]11 − polyanion consists of two trivacant Keggin [B-α-AsW9O33]9 − moieties linked by one [WO(H2O)]4 + group and a dimeric [LnNa(H2O)4(OH)]3 + group resulting in the special 3s–5d–4f mixed metal substituted sandwich-type assembly. Interestingly, lanthanide and sodium ions simultaneously occupy the two positions located at the central belt of 1–3 with the site occupancy of 50% for each position. Moreover, the electrochemical and electrocatalytic properties of only 1 and 2 have been measured by cyclic voltammetry (CV) in 0.5 mol·L− 1 Na2SO4 + H2SO4 aqueous solution. 1 and 2 illustrate electrocatalytic activities for the hydrogen peroxide reduction. 相似文献
16.
Qing-Ran Wu Ji-Jiang Wang Huai-Ming Hu Bao-Cheng Wang Xing-Long Wu Feng Fu Dong-Sheng Li Meng-Lin Yang Gang-Lin Xue 《Inorganic chemistry communications》2010,13(6):715-719
Two novel cadmium(II) coordination polymers [Cd(cptpy)2]n·nH2O (1) with a 1D double chain structure and [Cd2(cptpy)2(ox)]n·2.5nH2O (2) with an interesting 3-connected uninodal six-fold interpenetrating ths network (Hcptpy = 4′-(4-carboxyphenyl)-2,2′:6′,2″-terpyridine, H2ox = oxalic acid) have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, single crystal X-ray diffraction and fluorescence spectra. 相似文献
17.
Summary The synthesis and cationic polymerization of (2S, 3S)-(+)-2-chloro-3-methylpentyl 4-(2-vinyloxyethyloxy)biphenyl-4-carboxylate (15–2) and (2S, 3S)-(+)-2-chloro-3-methylpentyl 4-(3-vinyloxypropyloxy)biphenyl-4-carboxylate (15–3) are described. The mesomorphic behavior of the resulting polymers is discussed as a function of the molecular weight and spacer length. Based on the second and subsequent heating and cooling scans, poly(15–2)s exhibit an enantiotropic SX (unidentified smectic) phase. Poly(15–2) with DP=4 is only crystalline. Poly(15–3)s show an enantiotropic cholesteric phase and an inverse monotropic SX phase. 相似文献
18.
Shuigang Liu Jun Ma Lianxiu Guan Junping Li Wei Wei Yuhan Sun 《Microporous and mesoporous materials》2009,117(1-2):466-471
A new solid base, mesoporous CaO–ZrO2 nano-oxides, was prepared via appropriate sol–gel process. It was found that such solid base showed high basicity and stability. Temperature programmed desorption of CO2 confirmed that both weak and strong basic sites coexisted on the surface of CaO–ZrO2 and the basicity could be modified by adjusting Ca/Zr molar ratio of the nano-oxides. The mesoporous CaO–ZrO2 nano-oxides showed high thermal stability, since X-ray diffraction (XRD) and transmission electron microscopies (TEM) proved that the mesoporous network of this material preserved well even up to 700 °C. At the same time, XRD and Raman spectra indicated that Ca2+ incorporated into t-ZrO2 lattice and the basic sites were firmly anchored to the substrate. As a result, this novel solid base showed remarkable activity and durability in the synthesis of dimethyl carbonate from methanol and propylene carbonate. 相似文献
19.
Gang Wang Tianyou Song Yong Fan Jianing Xu Miao Wang Liping Wang Lirong Zhang Li Wang 《Inorganic chemistry communications》2010,13(1):95-97
A novel lanthanide metal–organic framework, [Eu2(BDC)3(DMF)2]·(DMF)1.7(BDC = 1,3-benzenediacarboxylate) 1 has been synthesized under solvothermal condition and characterized by single-crystal X-ray structure determination, luminescent property, nitrogen gas adsorption, powder X-ray diffraction, IR, and TGA. 相似文献
20.
《Inorganic chemistry communications》2003,6(11):1358-1361
The reaction of cis-Re2(μ-O2CCH3)2Cl4(H2O)2 with picolinic acid (Hpic) affords either the diamagnetic, metal–metal bonded, dirhenium(III) complex Re2(μ-OMe)(μ:η2-pic)(η2-pic)3Cl (1) or the mononuclear rhenium(V) complex ReO(η2-pic)2Cl (2), depending on whether mixed methanol/ethanol or acetone/ethanol solvent mixtures are used. The structures of 1 and 2 have been established by X-ray crystallography. Complex 1 is unusual in having a bridging methoxide and bridging picolinate ligand in an edge-sharing bioctahedral structure in which the Re–Re bond distance of 2.4588(4) Å is unusually short for what is a formal Re–Re double bond. 相似文献