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1.
Hydrothermal reaction of a d10 configuration divalent metal precursor with flexible-arm aromatic ortho-dicarboxylates and a bis(pyridyl)piperazine-type neutral co-ligand has generated four coordination polymers, some with rare topologies. {[Cd(hmph)(4-bpmp)1.5]·4H2O}n (1, hmph = homophthalate, 4-bpmp = bis(4-pyridylmethyl)piperazine) manifests a new 3-fold interpenetrated uninodal 5-connected 3-D net with a very simple 4466 topology, different from the usual sqp 5-connected topology. [Cd2(hmph)2(4-bpfp)]n (2, 4-bpfp = bis(4-pyridylformyl)piperazine) displays a rare 4,5-connected binodal tcs net with (4462)(4466) topology. [Zn2(1,2-phda)2(4-bpmp)(H2O)2]n (3, 1,2-phda = 1,2-phenylenediacetate) possesses an uncommon 3,4-connected binodal 2-D layer with (426)(42638) (V2O5 prototype) topology. [Zn2(hmph)2(4-bpfp)]n (4) has a decorated (4,4) grid topology with embedded [Zn2(OCO)4] paddlewheel clusters. All materials exhibit ligand-centered fluorescent behavior. Thermal degradation behavior of the 3-D network materials is reported. 相似文献
2.
Hydrothermal synthesis has afforded divalent cadmium coordination polymers containing isophthalate (ip) or 5-methylisophthalate (mip) dicarboxylate ligands and bis(4-pyridylformyl)piperazine (4-bpfp) or bis(4-pyridylmethyl)homopiperazine (4-bpmh) tethers. {[Cd2(ip)2(H2O)2(4-bpfp)]·7H2O}n (1) displays a (4,4) grid topology based on {Cd2O2} dimeric clusters, along with “infinite” water molecule tapes with rare T4(0)A(1) classification. {[Cd(mip)(H2O)(4-bpfp)]·3H2O}n (2) also exhibits (4,4) grid layers but with 2D + 2D → 3D mutual inclined interpenetration instead of parallel stacking. [Cd4(ip)4(4-bpmh)2]n (3) has tetrameric {Cd4(ip)4} cluster units linked by ip and 4-bpmh ligands into a unique self-penetrated 3,5,5,5-connected tetranodal net with (4.82)(436285)(446482)(4.5648) topology. {[Cd2(mip)2(H2O)2(4-bpmh)]·2H2O}n (4) possesses a structure similar to that of 1, without the aggregated water molecule tapes. All four materials emit visible light upon ultraviolet excitation, ascribed to ligand-based electronic transitions. 相似文献
3.
Hydrothermal synthesis has afforded five d10 configuration divalent metal diphenate coordination polymers containing pyridyl-piperazine type ligands, which were structurally characterized by single-crystal X-ray diffraction. {[Cd(diphenate)(3-bpmp)(H2O)]·0.5H2O}n (1, 3-bpmp = bis(3-pyridylmethyl)piperazine) has a double layer topology. Its perchlorate-containing analog {[Cd3(diphenate)4(H23-bpmp)(H3-bpmp)(H2O)2](ClO4)·7H2O}n (2) possesses a very rare 4-connected 658 dmp topology based on anionic trinuclear nodes. {[Cd(diphenate)(4-bpfp)]·H2O}n (3, 4-bpfp = bis(4-pyridylformyl)piperazine) manifests a non-interpenetrated diamondoid lattice, while the related compound [Cd(diphenate)(4-bpmp)(H2O)]n (4, 4-bpmp = bis(4-pyridylmethyl)piperazine) has a simple (4,4) grid topology. {[Zn(diphenate)(4-bpmp)]·0.5H2O}n (5) displays a 2-fold interpenetrated diamondoid lattice. Luminescent properties of these materials are also reported. 相似文献
4.
Amy L. Pochodylo 《Inorganica chimica acta》2010,363(14):3951-3958
Four divalent metal coordination polymers containing bis(4-pyridylmethyl)piperazine (4-bpmp) and the ortho-dicarboxylate ligands phthalate (pht) or 4-methylphthalate (mpht) have been prepared by solvent diffusion or hydrothermal methods. {[Cu2(pht)2(H4-bpmp)2(H2O)2](NO3)2·H2O}n (1) and {[Cu2(pht)2(H4-bpmp)2(H2O)2](SO4)·2H2O}n (2) possess chiral cationic layer motifs formed by the junction of [Cu(H2O)(pht)]n chains by tethering curled-conformation H4-bpmp+ ligands. {[Co(pht)(H2O)(4-bpmp)]·5.5H2O}n (3) displays a (4,4) grid constructed from anti-syn carboxylate-bridged {Co2(H2O)2(pht)2} dimeric clusters linked by open-conformation 4-bpmp ligands. {[Cd2(mpht)2(H2O)2(4-bpmp)(H4-bpmp)]ClO4·4H2O}n (4) manifests cationic layered motifs based on neutral [Cd2(H2O)2(mpht)2] dinuclear units with {CdOC4O}2 12-membered circuits, linked by open-conformation 4-bpmp and H4-bpmp+ ligands. Variable-temperature magnetic data indicate likely concomitant zero-field splitting and ferromagnetic coupling in 3. Violet light emission is observed when 4 is subjected to ultraviolet irradiation. 相似文献
5.
Hydrothermal reactions of 2-, 3-, 4-cyanopyridine, NaN3 with CdCl2 in basified solvents yielded three coordination polymers [Cd3(2-pytta)2(N3)4(H2O)2]n (1), [Cd(3-pytta)2]n (2), [Cd3(4-pytta)2(N3)2Cl2(H2O)4]n (3). A similar reaction of tetrazole as ligand and the CdCl2 being replaced by CdI2 resulted in polymer [Cd2(tta)3I]n (4). X-ray single crystal structural analyses revealed that four compounds all show three-dimensional architectures. Complex 1 exhibits rare 3,4,4-connected 3-nodal with (3.92)2(3.94.10)(32.93.10) network in the Schäfli notation, while complex 2 is an anatase net with 3,6-connected (42.6)2(44.62.88.10) network. Complex 3 is 3,3,4,4-connected 4-nodal network with (4.102)2(42.104)(42.6.102.12)2(42.6)2 topology, and complex 4 can be simplified as an interesting alpha-Po network. The solid emission spectra of 1, 2, 3 and 4 have also been studied. From the results, it can be found complex 4 exhibits a long triplet lifetime that is unusual in CdII complexes. 相似文献
6.
Lei Li 《Inorganica chimica acta》2010,363(4):748-55
Three Cd (II)-M (II) hetero-nuclear coordination polymers, [FeCd2(Hcit)2(H2O)2]n (1), [CoCd2(BTC)2(H2O)4]n (2) and [Cd3(Hcit)2(H2O)2]n (3) (H4cit = citric acid, H3BTC = 1,3,5-benzenetricarboxyl acid), were synthesized through hydrothermal method. They were characterized through elemental analysis, IR spectra, UV-Vis absorption spectra, X-ray powder diffraction, single-crystal X-ray diffraction and surface photovoltage spectra (SPS). Structural analysis indicates that 1 and 3 possess 2D structures, which are further connected to 3D structures by hydrogen bonds. 2 is a 3D Cd-Co coordination polymer bridged by BTC3− groups. The SPS show that 1 and 2 present positive photovoltage response in 300-550 nm, but the photovoltage response of 3 appears in 300-400 nm. It is indicated that the limits of SPS response bands of polymers 1 and 2 are wider than those of 3 because of introduction of the other transition metal ions. There is a good corresponding relationship between SPS and UV-Vis absorption spectra. 相似文献
7.
Lei Gou Zhong-Xi Han Qing-Ran Wu Zhen-Hua Yang Fei Wang Gang-Lin Xue 《Inorganica chimica acta》2010,363(11):2590-2599
Five structurally diverse complexes, [Cd2(pyip)2(suc)2]n·1.5nH2O (1), [Zn(pyip)(glu)]n (2), [Cd(pyip)(glu)]n (3), [Zn(pyip)2(adip)2]n·2.5nH2O (4), [Cd3(pyip)2(adip)3]n (5) (pyip = 2-(pyridin-3-yl)-1H-imidazo[4,5-f][1,10]phenan-throline, H2suc = succinic acid, H2glu = glutaric acid, H2adip = adipic acid), have been hydrothermally synthesized. Complexes 1 and 4 are ribbon-like chains, in which pyip ligands attach to the both sides of the chain in pairs. Complex 2 is a one dimensional (1D) wave-like chain, while the pyip ligands attach to only one side of the chain. Complexes 3 and 5 are both two dimensional (2D) networks, in which the dicarboxylate ligands connect the dinuclear or trinuclear CdII units into layers with (4, 4) topological network. The structural differences among these complexes show that the organic acids have important influences on the final structures. 相似文献
8.
Four new cadmium(II) and zinc(II) coordination polymers {[Zn(btrp)(SIP)][Zn0.5(H2O)3]}n (1), {[Cd1.5(btrp)(SIP)(H2O)2]·2H2O}n (2), {[Cd1.5(btrb)(SIP)(H2O)3]·2H2O}n (3), {[Zn1.5(btrb)1.5(SIP)(H2O)2]·2H2O}n (4) (btrp = 1,3-bis(1,2,4-triazol-1-yl)propane, btrb = 1,3-bis(1,2,4-triazol-1-yl)butane, NaH2SIP = 5-sulfoisophthalic acid monosodium salt) have been synthesized under hydrothermal conditions and structurally characterized. Compound 1 possesses an infinite 1D ladder-like chain structure with [Zn(H2O)6]2+ trapped in the pores, which is further interconnected by π?π interactions to lead to a 2D supramolecular architecture. Compounds 2 and 3 features two similar 2D layer structures, and the resulting 2D structures are interconnected by hydrogen-bond interactions to lead to 3D supramolecular architectures. Compound 4 is a 2D parallel ladder structure, and through the interpenetrating btrb ligand, it constructs into 3D architectures. Luminescence analyses were performed on all the four compounds, which show strong fluorescent emissions in the solid state at room temperature. 相似文献
9.
Xiao-Feng Zheng 《Inorganica chimica acta》2011,365(1):419-429
Four coordination polymers based on AgI/3-sulfobenzoate/N-donor ligands, [Ag2Na2(3-sb)2(H2O)7]n (1), {[Ag2(3-sb)(apy)]·(H2O)}n (2), {[Ag2(4,4′-bipy)2(H2O)3]·[Ag2(4,4′-bipy)2(H2O)2]·2(3-sb)·4(H2O)}n (3) and {[Ag(3-sb)(bpe)(H2O)][Ag(bpe)(H2O)]·3(H2O)}n (4) where 3-sb is 3-sulfobenzoate, apy is 2-aminopyridine, bipy is 4,4′-bipyridine and bpe is 1,2-bis(4-pyridyl)ethylene, were prepared and characterized, and their fluorescence and electric conductivity properties were studied. Complex 1 is a 3D architecture in which 3-sb ligands exhibit μ4-κ1(O1,O2-Ag): κ1(O3,O5-Na) trans-trans coordination mode. The molecular structure of 2 is a 2D layer. Complexes 3 and 4 are cation-anion species and 1D polymers. In these complexes hydrogen bonds provide additional assembly forces, giving 3D hydrogen bonding networks for 1 and 3, and 2D layers for 2 and 4. Abundant weak interactions, such as Ag-Ag interactions in 1-3, Ag-π interactions in 1-4, π-π interactions in 1, 3-4, and C-H···π interactions in 3-4, also can be found. The weak interactions are strongly related to the fluorescence and electric conductivity properties, providing the way for understanding the relationship between structures and properties. 相似文献
10.
Karyn M. Blake 《Inorganica chimica acta》2011,373(1):201-210
Divalent cobalt coordination polymers containing both ortho-phenylenediacetate (ophda) and rigid dipyridyl ligands 4,4′-bipyridine (bpy) or 1,2-bis(4-pyridyl)ethylene (dpee) display different topologies depending on carboxylate binding mode, tether length, and inclusion of charged species. [Co(ophda)(H2O)(dpee)]n (1) displays a common (4,4) grid layer motif. Use of the shorter bpy tether afforded {[Co2(ophda)2(bpy)3(H2O)2][Co(bpy)2(H2O)4](NO3)2·2bpy·7H2O}n (2) or [Co(ophda)(bpy)]n (3) depending on cobalt precursor. Compound 2 manifests 5-connected [Co2(ophda)2(bpy)3(H2O)2]n pillared bilayer slabs with rare 4862 SnS topology and entrained [Co(bpy)2(H2O)4]2+ complex cations. The 3-D coordination polymer 3 has an uncommon 4,6-connected binodal (4462)(446108) fsc topology, and shows ferromagnetic coupling (J = +1.5(2) cm−1) along 1-D spiro-fused [Co(OCO)2]n chain submotifs. 相似文献
11.
Xiao-Li Chen Qing-Ran Wu Feng Fu Yuan-Yuan Hui Gang-Lin Xue 《Inorganica chimica acta》2010,363(2):360-3894
Three novel d10 metal coordination polymers, {[Cd(H2odpa)(phen)2]·H2O}n (1), [Cd2(odpa)(phen)(H2O)2]n (2), {[Zn4(odpa)2(phen)2(H2O)2]·H2O}n (3), (H4odpa = 4,4′-oxydiphthalic acid, phen = 1,10-phenanthroline) were obtained with different metal/ligand ratios through hydrothermal method and characterized. Compound 1 forms a one dimensional zigzag chain, in which two phen ligands chelate to one cadmium atom. Compound 2 shows a three dimensional network structure comprised of new tetranuclear cadmium clusters as the nodes and (odpa)4− anions as the linkers, exhibits an unusual topological structure. Compound 3 is an unprecedented three dimensional polymer based on octanuclear zinc clusters cross-linked by (odpa)4− anions. In 1-3, central CdII/ZnII ions and (odpa)4− ligand display completely different coordination modes and conformations. In addition, the thermal stabilities and photoluminescence properties of 1-3 were also studied. 相似文献
12.
Ten transition metal coordination complexes [Cu2(phen)(p-tpha)(μ-O)]n1, [Cu(m-tpha)(imH)2]n2, [Ni(5-Haipa)2(H2O)2]n3, [Ni(phen)2(H2O)2]·btc·[Ni(H2O)6]0.5·9H2O 4, [Co(2,5-pdc)(H2O)2]n·nH2O 5, [Co2(2,5-pdc)2(H2O)6]n·2nH2O 6, [Fe(2,5-Hpdc)2(H2O)2]·H2O 7, [Co(C6H4NO2)3]·H2O 8, [Fe2(μ2-btec)(μ2-H2btec)(bipy)2(H2O)2]n9, [Mn(phen)(2,5-pdc)(H2O)2]·H2O 10 (H4btec = 1,2,4,5-benzenetetracarboxylic acid, phen = 1,10-phenanthroline, 2,5-H2pdc = 2,5-pyridine-dicarboxylic acid, p-tpha = p-phthalic acid, m-tpha = m-phthalic acid, bipy = 2,2′-bipyridine, 5-H2aipa = 5-aminoisophthalic acid, imH = imidazole, H3btc = 1,3,5-benzenetricarboxylic acid) were synthesized through hydrothermal method. They were characterized by UV-Vis absorption spectra, single-crystal X-ray diffraction and surface photovoltage spectra (SPS). Structural analysis indicated that the complexes 1, 2, 3, 5, 6 and 9 were linked into infinite structures bridged by organic acid ligands. The other four complexes were molecular complexes and further connected to 2D or 3D structures by the hydrogen bonds. The SPS of complexes 1-10 indicate that there are positive response bands in the range of 300-800 nm showing different levels of photo-electric conversion properties. The intensity, position, shape and the number of the response bands in SPS are obviously different since the structure, species, valence, dn electrons configuration and coordinated environment of the center metals are different. There are good relationships between SPS and UV-Vis spectra. 相似文献
13.
Rojalin Sahu 《Inorganica chimica acta》2010,363(14):4008-4016
Four new hetero-bimetallic Co3+-Na+ and Co3+-K+ coordination polymers having the molecular formulae [Na(H2O)Co(L)(N3)3]n (1), [Na2Co(L)(N3)3(H2O)5][Co(L)(N3)3] (2), K[Co(L)(NCS)3]·H2O (3) and K[Co(L)2][Co(NCS)4]·0.5H2O (4), were synthesized. Compounds 1-4 were characterized by single crystal X-ray diffraction, IR, UV-Vis, and thermogravimetric methods. These bimetallic systems have EE, EO azide bridge (1, 2) as well as bent (1, 2, 3) and linear (1, 4) aquo bridges. Important features observed among them were: a Z-shaped and diamond-shaped Co2Na2 clusters in 1, a centrosymmetric double ladder like polymer based on Na4 cluster in 2, and a linear KOK core having paddle-wheel structure in 4. 相似文献
14.
The self-assembly of a V-shaped ligand 3,3′,4,4′-diphenylsulfonetetracarboxylate (dstc) and metal salts in the presence of a series of N-donor ligands yielded four new complexes, namely, [Cu4(H2dstc)4(phen)4]·12H2O (1), {[Cu2(dstc)(bpe)(H2O)2]·4H2O}n (2), [Cu3(dstc)(bipy)(μ2-OH)2(H2O)2]n (3), {[Cd5(dstc)2(bipy)2(μ3-OH)2(H2O)4]·4H2O}n (4) (phen = 1,10-phenanthroline; bpe = 1,2-bis(4-pyridyl)ethene; bipy = 4,4′-bipyridine). All the complexes were structurally determined by single-crystal X-ray diffraction and characterized by elemental analyses, IR spectra, X-ray powder diffraction and TG analyses. Complex 1 is a discrete tetranuclear unit, which further assembles into a 3D supramolecular framework by intermolecular hydrogen bonding interactions. Complex 2 is composed of 2D 44 grid-like layers based on dinuclear copper units. Complex 3 features a rare 3D (6,8)-connected topological net consisting of trimetallic clusters. 12-connected pentanuclear cadmium clusters are observed in complex 4 and the resulting structure shows an uncommon (4,12)-connected topology. The structural differences among 1-4 demonstrate that the nature of the N-donor assistant ligands and metal ions can play critical roles in the formation and structures of the resulting complexes. Magnetic studies showed antiferromagnetic interactions for 1 and 3. In addition, the luminescent property of 4 was also studied. 相似文献
15.
Li-Zhen Cai Ming-Lai Fu Ming-Sheng Wang Wen-Tong Chen Jin-Shun Huang 《Inorganica chimica acta》2006,359(14):4483-4492
Assembly of isonicotinic acid ligand (HL) with metal halide, five new hybrid complexes [CdI2(C5H4NCOOH)(C5H4NHCOO)] · H2O (1), Nan[ZnCl2(C5H4NCOO)]n · 2nH2O (2), [CdX(C5H4NCOO)]n (X = Br (3), I (4)) and [Cd3Cl2(OH)2(C5H4NCOO)2]n (5) were obtained, which display a variety of structural motifs, ranging from zero-dimensional to complicated three-dimensional networks. Complex 1 possesses an isolated unit MX2 that is further connected into 3D networks through hydrogen bonding and π-π stacking interactions. Complex 2 is characterized by an infinite one-dimensional chain of zinc atoms bridged by L− ligands. While complexes 3 and 4 possess X-bridging ∞1[CdX2/2] inorganic chains connected by L− ligands to form a 2D hybrid network structure. In the case of 5, the cadmium(II) cation is bridged by μ3-Cl atom and μ3-OH− group to form a 2-D ∞2[Cd6/2Cl6/3(μ3-OH)2] inorganic layer which is further extended into 3-D framework by bridging L− ligand via Cd-N and Cd-O bonds. The optical properties of 1, 4, and 5 in the solid state are investigated at room temperature and time-dependent DFT (TDDFT) calculation using the B3LYP functional has been performed on 1. The result indicated that the emission band of 1 is attributed to an admixture of MLCT (metal-to-ligand charge-transfer) and LLCT (ligand-to-ligand charge-transfer). 相似文献
16.
Hydrothermal reactions between H4ODPA (2,2′,3,3′-oxydiphthalic acid) and metal ion salts of Ba2+, Cu2+, Zn2+ and Gd3+ afford four novel coordination polymers [Ba(H2ODPA)(H2O)4] · H2O (1), [Cu2(ODPA)(H2O)3] · H2O (2), Zn2(ODPA)(H2O)2 (3) and [Gd(HODPA)(H2O)3.5] · H2O (4), accordingly. These polymers show great differences in regard to their structures and properties originated from the variation of size and coordination geometry of the metal ions. Compound 1 presents puckered achiral layer structure with (4.82) topology with helices, 2 has a 63 topology with copper tetramer as SBUs, 3 has chiral layer with two kinds of helices built up from Zn-binuclear “paddle-wheel” like SBUs, and 4 features a simple 1D helix with opposite chirality. Compound 3 shows obvious fluorescent emissions upon excitation. Compound 2 shows ferromagnetic interactions between CuII centers bridged by carboxylate groups, whereas compound 4 presents weak ferromagnetic interaction between GdIII ions. 相似文献
17.
Gui-Lin Wen Ping Liu Chun-Yan Guo Wei-Hong Zhang Qi-Zhen Shi 《Inorganica chimica acta》2009,362(6):1730-2521
Six new coordination polymers based on V-shaped linkage 2,5-bis(4-pyridyl)-1,3,4-thiadiazole (bpt) and transition metal ions, [Co(bpt)(pm)0.5(H2O)]n · 3nH2O (1), [Cu2(bpt)(pm)(H2O)4]n (2), [Co(bpt)(pydc)]n · 2nCHCl3 · nH2O (3), [Cu2(bpt)(pydc)2(H2O)2]n (4), [Cu2(bpt)(pydco)2(H2O)2]n · nH2O (5) and [Cd(bpt)(pydco)]n (6) (H4pm = pyromellitic acid, H2pydc = pyridine-2,6-dicarboxylic acid, H2pydco = pyridine-2,6-dicarboxylic acid N-oxide), have been synthesized under the intervention of various polycarboxylate ligands. Complex 1 exhibits a 3-D 4-connected structure with 1-D nanosized open channels encapsulated lots of water molecules. Complex 2 represents a 2-D grid containing two types of rectangular windows. When pydc and pydco instead of pm, complexes 3 and 6 were obtained with highly undulated 2-D layers. The interlayers of 3 are filled with two kinds of solvent molecules, whereas 6 is a double-layered framework without free molecules. Complexes 4 and 5 consist of two distinct 1-D infinite chains held together to form different 2-D supramolecular networks. Importantly, bpt spacer shows changeful conformational geometries and generates complicated crystalline architectures with the introduction of polycarboxylate ligands. Additionally, thermal stability of complexes 1, 3 and 5, fluorescent properties of 6 and X-ray powder diffraction of 1 have also been investigated. 相似文献
18.
Treatment of 3-(4-carboxyphenylhydrazono)pentane-2,4-dione (HL) with transition metal ions afforded four novel complexes, [Zn(L)(μ2-OOCCH3)(H2O)]n (1), [Zn(L)2(MeOH)4] (2), {[Cd4(η2-L)4(μ2-η2-L)4(H2O)4(MeOH)2]·MeOH} (3) and [Cd(η2-L)(μ2-η2-OOCCH3)(H2O)2]n (4). Their crystal structures have been characterized by single-crystal X-ray crystallography. In polymer 1, the acetate anions bridge the Zn(II) ions forming an infinite one-dimensional (1-D) chain with L− units acting as monodentate ligands in the side chain. In mononuclear complex 2, two L− ligands act as monodentate fashion to coordinate to the Zn(II) ion. In its solid-state structure, [Zn(L)2(MeOH)4] groups are joined together by hydrogen bonds forming a three-dimensional (3-D) supramolecular network. In tetranuclear complex 3, four Cd(II) ions are linked by four μ2-η2-L− ligands, and chelated by another four L− ligands, respectively. In polymer 4, the acetate anions bridge the Cd(II) ions leading to a 1-D chain containing chelating L− units in the side chain. 相似文献
19.
Two lanthanide coordination polymers, {[La2(bpdc)3(H2O)4]·(H2O)4}n (1) and {[Sm2(bpdc)3(H2O)2]·(H2O)5}n (2) (H2bpdc = 2,2′-bipyridine-3,3′-dicarboxylic acid) have been obtained by hydrothermal synthesis. Single-crystal X-ray diffraction shows that 1 and 2 are two-dimensional network structures based on the zigzag chains which are linked by bpdc ligands, forming the first examples of binary lanthanide polymers with bpdc. It is unprecedented that the adjacent zigzag chains are symmetrical in mirror images with the arraying form of ?ABAB?. In 1 and 2, lanthanide ion are all nine-coordinate and bpdc ligands exhibit different kinds of coordination modes. The 1-D infinite water chain in 1 and pentameric water ring in 2 have been found between lattice water molecules. Thermo-gravimetric analyses of 1 and 2 display considerable thermal stability. Photoluminescent properties of 1 and 2 are discussed. 相似文献
20.
In this paper, we have presented the synthesis and crystal structures of five coordination polymers, namely, {[Ni2(cysteate)2(bpy)2(H2O)2]·3H2O}n (1), {[Cu2(cysteate)2(bpy)2(H2O)2]·4H2O}n (2), {[Mn2(cysteate)2(bpy)(H2O)4](bpy)·H2O}n (3), {[Zn2(cysteate)2(bpy)(H2O)4](bpy)·H2O}n (4), {[Cd(cysteate)(bpy)(H2O)]·4H2O}n (5), using homochiral l-cysteate and 4,4′-bipyridine (bpy) as mixed ligands, reacted with Ni(II), Cu(II), Mn(II), Zn(II) and Cd(II) ions, respectively. When different metal centers being used, l-cysteate gave rise to three different architectures based on coordination polymeric chains: (1) a helical chain, which is further connected by bpy pillars to generate a racemic twofold 3D (42.84)-lvt net in 1 and 2; (2) a zigzag chain, which is further linked by bpy pillars into a homochiral 2D brick-wall structure in 3 and 4; (3) a zigzag chain, which is further linked by bpy pillars into a homochiral 2D 44 grid network in 5. These results indicate that the metal-directed M(II)-cysteate chain has an important effect on the structural diversification of such complexes. 相似文献