共查询到20条相似文献,搜索用时 15 毫秒
1.
Sudarshana Mukherjee Yanhua Lan Ghenadie Novitchi George E. Kostakis Christopher E. Anson Annie K. Powell 《Polyhedron》2009,28(9-10):1782-1787
Three new heterometallic 1D coordination polymers [FeIII2Pr(4-Me-sal)4(2,2′-bipy)2(H2O)6](NO3) · 2MeOH · 1.5H2O (1), [FeIII2Gd(4-Me-sal)4(2,2′-bipy)2(H2O)5]Cl1/2(NO3)1/2 · 5H2O (2) and [FeIII2Dy(4-Me-sal)4(2,2′-bipy)2(H2O)5]Cl1/2(NO3)1/2 · 5H2O (3) have been synthesized. 1 and 2 were characterized by single-crystal X-ray crystallography, and 3 was shown to be isomorphous to 2 by X-ray powder diffraction. Magnetic studies show that the three compounds show a similar temperature dependence of their magnetic susceptibilities over the range 1.8–300 K. The observed decrease of χT with decreasing temperature for all three compounds could be the result of antiferromagnetic interactions between Fe–Ln centres and/or the depopulation of the Stark sublevels in the case of the anisotropic Ln ions (PrIII and DyIII). 相似文献
2.
《Journal of Coordination Chemistry》2012,65(10):1676-1685
Three new complexes, {[Mn(dtb)(bpe)·2H2O]·H2O} n (1), {[Mn(dtb)(bpa)·2H2O]·H2O} n (2), and {[Mn(dtb)(phen)]} n (3) [H2dtb?=?5,5′-dithiobis(2-nitrobenzoic acid), bpe?=?1,2-bis(4-pyridyl)ethene, bpa?=?1,2-bi(4-pyridyl)ethane, phen?=?1,10-phenanthroline], have been synthesized under hydrothermal conditions with Mn(OAc)2·4H2O, dtb, and different N-donor ligands. X-ray structure analyses of 1 and 2 reveal analogous structures with 1D helical chains and 2D 44 chiral layers. The structure of 3 shows a 1D chain which is outwardly decorated with phen ligands. These neutral polymeric complexes exhibit structural diversity due to the different coordination modes of the flexible dtb ligand and the N-donor ligands. The thermogravimetric analyses and X-ray powder diffractions of 1–3 are also presented. 相似文献
3.
Solvothermal syntheses and crystal structures of two metal coordination polymers with double-chain structures 总被引:3,自引:0,他引:3
Two polymeric complexes, [Cu2(btec)(phen)2]n·(H2O)n (1) and [Cd4(btec)2(phen)4(H2O)4]n (2) (H4btec=1,2,4,5-benzenetetracarboxylic acid; PHEN=1,10-phenanthroline), were synthesized by solvothermal reactions at 140 °C. Both complex 1 and 2 possess infinite double-chain structures, in which each Cu(II) center has a tetrahedral configuration and the Cd(II) centers adopt triangular prismatic and square-based pyramidal configurations simultaneously. The inter-chain face to face π–π interactions among the aromatic rings of phen and the hydrogen bond interactions between aqua molecules and carboxyl O atoms result in 3-D networks in the two complexes. The ESR spectra study of complex 1 shows that there is negligibly small long-range super-exchange interactions between the Cu(II) atoms via benzenecarboxylate bridging. 相似文献
4.
Three new 3d-4f heterometallic coordination polymers, [Ln(2)(H(2)O)(4)M(2)(H(2)O)(2)(QA)(5)].nH(2)O (H(2)QA = quinolinic acid; Ln = Gd, M = Ni, n = 7 (1); Ln = Gd, M = Co, n = 6.5 (2); Ln = Dy, M = Co, n = 6.5 (3)), have been synthesized through hydrothermal pretreatment and cooling-down crystallization. These compounds possess the isostructural 3D frameworks with 1D chairlike channels along the c axis, which are occupied by noncoordinating water molecules. Crystal data: for 1, C(35)H(41)Gd(2)Ni(2)N(5)O(33), orthorhombic, space group Pna2(1), with a = 28.567(6) A, b = 14.498(3) A, c = 12.250(2) A, and Z = 4; for 2, C(35)H(40)Gd(2)Co(2)N(5)O(32.5), orthorhombic, space group Pna2(1), with a = 28.843(3) A, b = 14.4325(13) A, c = 12.2275(9) A, and Z = 4; for 3, C(35)H(40)Dy(2)Co(2)N(5)O(32.5), orthorhombic, space group Pna2(1), with a = 28.8471(14) A, b = 14.4534(10) A, c = 12.2520(7) A, and Z = 4. The magnetic behaviors for the three compounds have been investigated. 相似文献
5.
Guang-Ju ZhangDong-Rong Xiao Dian-Zhen SunHai-Yan Chen Jiang-Hong HeRuo Yuan En-Bo Wang 《Solid State Sciences》2012,14(1):62-71
Self-assembly of presynthesized [Sb2(tart)2]2− metalloligand as molecular building block with metal salts affords three unique heterometallic coordination polymers, namely, {[Ln(H2O)6][Sb2(tart)2]}Cl·5H2O (Ln = La (1), Pr (2)) and {[Ba2(H2O)7][Sb2(tart)2]2}·4H2O (3), (tart = tartaric acid). Their structures were determined by single crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, and TG analyses. Compounds 1 and 2 are isostructural and represent the first examples of lanthanide-organic open frameworks containing [Sb2(tart)2]2− metalloligands. The structures of 1 and 2 contain left-handed and right-handed layer, each built up from the same-handed helical chains. Compound 3 consists of two kinds of arm-shaped chiral layers, which alternately stack in a heterochiral fashion to yield a racemic 3D hydrogen-bonded network with 1D channels along the a axis. To the best of our knowledge, compounds 1-3 are the first 2D chiral layer frameworks constructed from [Sb2(tart)2]2− metalloligands and rare-earth or alkaline-earth metal ions. 相似文献
6.
Chen Y Zheng L She S Chen Z Hu B Li Y 《Dalton transactions (Cambridge, England : 2003)》2011,40(18):4970-4975
The syntheses, crystal structures and magnetic properties are described for two novel 2D heterometallic Cu(II)-Sr(II) coordination polymers {Sr(H(2)O)(6)[(Im)(4)Cu(4)(pdc)(4)Sr(H(2)O)(4)]·6H(2)O}(n) (1) and [Cu(2)(H(2)O)(2)(pdc)(2)Sr(H(2)O)(3)](n) (2) (H(3)pdc = 3,5-pyrazoledicarboxylic acid; Im = imidazole). The 1 : 1 : 1 : 5 reaction of SrCl(2)·6H(2)O, Cu(NO(3))(2)·3H(2)O, H(3)pdc and imidazole in H(2)O-EtOH at 120 °C under autogenous pressure gave 1. Complex 2 was obtained from the 1 : 1 : 1 H(3)pdc/Sr(OH)(2)·8H(2)O/Cu(NO(3))(2)·3H(2)O reaction mixture in H(2)O-EtOH under solvothermal conditions. Complex 1 can be described as a 2D grid-shaped network with the four Cu(II) ions in a saddle-like conformation. In complex 2, Sr(II) ions link metalloligands [Cu(2)(pdc)(2)(H(2)O)(2)](2-) to generate a 2D layer framework. Variable-temperature solid-state dc magnetic susceptibility studies have been performed in the temperature range 2.0-300 K for complexes 1 and 2. Antiferromagnetic Cu(II)···Cu(II) exchange interactions were found for both 1 and 2. 相似文献
7.
Two novel rare earth coordination polymers, [La(pydc)2(H2O)][La(pydc)(H2O)2]·H2O (1) and [Sm(pydc)2(H2O)][Sm(pydc)(H2O)2]·H2O (2) (pydc=pyridine-2,6-dicarboxylate) were hydrothermally synthesized and characterized by the elemental analyses, IR spectra and TG analyses. Single crystal X-ray diffractions show that 1 and 2 are isostructural compounds. In the compounds of 1 and 2, the 1D lanthanide helical chains are connected each other by lanthanide binuclear dimer as building blocks to form a novel 3D covalent framework. 相似文献
8.
The solvothermal reactions of AgX (X = CN, SCN) with mbix [mbix = 1,3-bis(imidazole-l-yl-methyl)benzene] or bix [bix = 1,4-bis(imidazole-l-yl-methyl)benzene] afforded the polymers [AgCN(mbix)]n (1), [(AgCN)4(bix)2]n (2) and [(AgSCN)2(mbix)]n (3). They were all characterized by infrared spectroscopy, elemental analysis and X-ray single-crystal analysis. The structure of 1 contains a 3-fold-interpenetrated 2D network, while that of 2 exhibits 2-fold parallel interpenetration. There is no interpenetration observed in 3. Compounds 2 and 3 show 3D supramolecular structures built from 2D networks through weak π ? π interactions. The photoluminescent properties of the present compounds were also investigated. 相似文献
9.
Ting Yang Jie Wang Jia-Guo Wang Shun Wang Hong-Ping Xiao 《Transition Metal Chemistry》2013,38(8):865-871
The reactions of silver nitrate with 2-sulfoisophthalic acid (H3stp) in the presence of N-donor ligands produced three coordination polymers; [Ag3(stp)(pyz)0.5]n (1), {[Ag4(dpp)4]·2(Hstp)·9H2O}n (2), and {[Ag(bpe)]2[Ag2(bpe)2]2·2(stp)·19H2O}n (3) [pyz = pyrazine, bpp = 1,2-bis(4-pyridyl)propane, bpe = 1,2-di(4-pyridyl)-ethylene]. The complexes have been characterized by single-crystal X-ray diffraction, physico-chemical, and spectroscopic methods. Single-crystal X-ray diffraction reveals that complex 1 is a 2D silver carboxylate-sulfonate layered structure, in which the 2D layers are further linked by the N-donor atoms of pyz ligands into a 3D supramolecular structure. Complex 2 is an infinite 1D chain arrangement with the [Ag2(dpp)2]2+ unit in which weak Ag···Ag or Ag···O interactions extend the chains into 2D structures. Complex 3 has a 3D supramolecular structure constructed by hydrogen bonding, π–π stacking, and Ag···O interactions to link the ligands, metal atoms, and water molecules together. The luminescence properties of the complexes were investigated. 相似文献
10.
A versatile solvent-free mechanochemical route to the synthesis of heterometallic dicyanoaurate-based coordination polymers 总被引:1,自引:0,他引:1
The solid-state mechanochemical method was proved to be a fast, simple, and efficient route to the synthesis of heterometallic [Au(CN)(2)]-based coordination polymers. Thus, a series of mixed-metal complexes, such as KCo[Au(CN)(2)](3), KNi[Au(CN)(2)](3), Cu(H(2)O)(2)[Au(CN)(2)](2), and Zn[Au(CN)(2)](2), was obtained by grinding stoichiometric amounts of K[Au(CN)(2)] and transition metal(II) chlorides. This solid-state method rapidly yields pure dicyanoaurate-based compounds, also in cases when the aqueous solution synthesis leads to an unseparable mixture of products. In addition, in some cases, the solid state reaction was faster than the corresponding solvent-based reaction. This mechanochemical method can be applied also to main group metals to obtain various cyanoaurate-based heterometallic coordination polymers, such as Me(2)Sn[Au(CN)(2)](2) and Ph(3)Sn[Au(CN)(2)]. For the 2:1 mixture of K[Au(CN)(2)] and Me(2)SnCl(2), the dramatic enhancement of the reaction rate by the presence of a minor amount of water was noticed. In Ph(3)Sn[Au(CN)(2)], as was revealed by single-crystal X-ray diffraction, each Ph(3)Sn unit is linked to two others by two Au(CN)(2) bridges via Sn-N bonds to form an infinite cyanide-bridged chain. There are no Au···Au contacts between the chains due to the sterical hindrance of the phenyl groups. A dehydrated blue Co[Au(CN)(2)](2) complex was obtained during grinding or heating of the moderate-pink Co(H(2)O)(2)[Au(CN)(2)](2) complex. This complex displays a vapochromic response when exposed to a variety of organic solvents, as well as water and ammonia vapors. 相似文献
11.
A series of conducting mixed-metallic coordination polymers: Cu2Pb(SCN)4, CuPb(SeCN)4, CuII
0.50CuIPb (SCN·SeCN)2, CuAg(SCN)2, CuAg(SeCN)2 and CuAg(SCN·SeCN) have been synthesized by the reaction of Cu and PbII or AgInitrates with KSCN or KSeCN, or both KSCN and KSeCN in H2O. Of significance are the aerobic reactions which yield heterometallic complexes viaoxidation of SCN– and SeCN– into (SCN)2 and (SeCN)2 followed by quantitative reduction of CuII into CuI; in the case of CuPb(SeCN)4 reduction of CuII into CuI is not observed, while in CuII
0.50CuIPb(SCN·SeCN)2, CuII is partially reduced to CuI. These compounds have been characterized by elemental (C, N, S and Se) analyses, magnetic moment measurements, relevant spectroscopies (i.r., far i.r., Raman, u.v.–vis. and e.p.r.), powder X-ray diffraction pattern and conductivity technique. The v(CN) vibrations in 2162–2087cm–1 and far i.r. bands (500–100cm–1) corroborated by Raman bands are conclusive of the bridging (N, S/Se) mode and metal-NCS and metal-SCN/SeCN– bonding respectively in the complexes. Room temperature magnetic moment, electronic absorption spectra and e.p.r. active/silent nature confirm the oxidation state of copper in these solids. Room temperature compressed pellet conductivities
rt, 10–9to 10–7Scm–1 with activation energies, E
a=0.19–0.25eV and increase in the conductivity with increase in temperature in the 305–423K, range and decrease in conductivity with decrease in temperature in the 295–200K range, show their semiconductor properties. 相似文献
12.
Pore surface control of microporous coordination polymers is of great interest due to the potentially exciting functionalities it presents, such as highly selective separation, chemisorption, and novel catalysts and sensors. A discussion of our unique strategy aimed at surface engineering using metalloligands, i.e., introduction of coordinatively unsaturated metal centers, is presented. 相似文献
13.
Homochiral 3D open frameworks have been assembled from 1- and 2-D coordination structures via hydrogen bonding and are stable towards the removal of included guest molecules. 相似文献
14.
Haitao Zhou Kang Yang Yao Liu Yunzhi Tang Wenjuan Wei Qing Shu Jinjun Zhao Yuhui Tan 《中国化学快报》2020,31(3):841-845
We report on the synthesis of two acentric and one centrosymmetric Zn metal-organic complexes with 3-tetrazolenethyl pyridine spacers obtained in situ by hydrothermal routes.X-ray diffraction structural analysis reveals that they have the same equivalent nodes but with dissimilar topologies.The two acentric frameworks[Zn(Tzmp)Cl]n(1)and([Zn(Tzmp)Br]n(2),HTzmp=3-tetrazolemethyl pyridine)are isomorphism which exhibit an acentric 3D framework with(10,3)-b net called"ths",while the centro symmetric complex([Zn(Tzmp)N3]n(3))features a distinctive 2D sheet with Shubnikov hexagonal plane net.Photo-luminescent studies suggest the ligand-field strength of coordinated negative ions(Cl^->Br^->N3^-)has ordered adjusting effects on the emission redshift.The second harmonic generation(SHG)measurement shows that compounds 1 and 2 are nonlinear optically active,with SHG responses being 2/3 and half of the standard potassium dihvdrogen phosphate(KDP),respectively. 相似文献
15.
N. V. Zauzolkova M. E. Nikiforova M. A. Kiskin A. S. Bogomyakov A. A. Sidorov I. L. Eremenko 《Russian Chemical Bulletin》2011,60(2):273-279
The reaction of cobalt(II) chloride with 2-hydroxypyridine (Hhp) and lithium pivalate in acetonitrile affords the 1D polymer
[Li3CoCl(μ-Piv)(μ3-Piv)2(μ3,η2-Piv)(μ-Hhp)2(η1-HPiv)]
n
, in which the repeating units are linked by bridging pyridone molecules. The reaction of cobalt nitrate hexahydrate with
2-hydroxy-6-methylpyridine (Hmhp) in the presence of the deprotonating agent (Et3N) resulted in the crystallization of the 1D polymer of the composition [Li2Co7(μ3-OH)2(μ3-Piv)3(μ-Piv)2(μ3,η2-mhp)5(μ,η2-mhp)2(μ3-mhp)(μ,η2-NO3)·2MeCN]
n
, in which the bulky metal fragments {Li2Co7(OH)2(Piv)5)(mhp)8} are linked together through the lithium atoms by chelate bridging nitrate anions. The resulting 1D polymers were characterized
by X-ray diffraction, and their magnetic properties were investigated. 相似文献
16.
Three supramolecular coordination polymers (SCPs) [(AgSCN)2L] {L = 4,4′-bipyridine (bpy) (1), trans-1,2-bis(4-pyridyl)ethylene (tbpe) (2) and phenazine (phenz) (3)} have been synthesized and structurally characterized by single-crystal X-ray diffraction. Synthesis was affected in H2O/acetonitrile/NH3 media at room temperature. The bpy, tbpe and phenz bipodal ligands adopt different conformations which would affect the skeleton of the (AgSCN)n building blocks that allow the interconnection of the (AgSCN)n fragments and propagation of the network structure in three dimensions. Supramolecular interactions such as hydrogen-bonding, argentophilic interaction and π–π stacking play an important role in the assembly of these coordination polymers. 相似文献
17.
Three novel coordination polymers, [Ni2(tib)2(btec)]·2H2O (1), [Co2(tib)2(btec)]·2H2O (2) and [Zn4(tib)2(btec)Cl4]·2H2O (3), have been synthesized by using mixed ligands of 1,3,5-tris(1-imidazolyl)benzene (tib) and 1,2,4,5-benzenetetracarboxylic acid (H4btec) under hydrothermal conditions. Complexes 1 and 2 have the same structure and are rare three-dimensional (3D) self-penetrating (3,4,5)-connected nets, while complex 3 is an unprecedented (3,4)-connected 3D net. The different structures of 1 (2) and 3 are ascribed to the distinct coordination geometry of the metal centers. The thermal stability and photoluminescence property of the complexes were investigated. 相似文献
18.
Selçuk Demir Günay Kaya Kantar Yıldıray Topcu Qiaowei Li 《Transition Metal Chemistry》2012,37(3):257-263
The complexes [Co(C4H4O4)]n (1) and [Zn(im)2(C4H4O4)]n
(2) (C4H4O4 = succinate dianion, suc; im = imidazole) have been synthesized solvothermally and characterized by elemental analysis, IR,
TG–DTA, and single-crystal X-ray diffraction techniques. Complex 1 is the first anhydrous member of the cobalt succinate family and has high thermal stability under a static air atmosphere,
up to 425 °C, and complex 2 is a 1D coordination polymer. In addition, a new synthesis method and some properties of the known [Co(HCOO)2·2H2O]n (3) complex are reported. After in situ synthesis of 3 via decomposition of DMF at 140 °C, it was found that complex 3 can adsorb some solvents repeatedly and is selective for H2O. 相似文献
19.
Four novel coordination polymers constructed from flexible pamoic acid, namely [Co(pam)(4,4′-bipy)]n·nH2O (1), [Ni(pam)(4,4′-bipy)(H2O)2]n·2nCH3CN (2), [Cd(pam)(py)2]n·npy (3) and [Mn2(pam)2(py)6(H2O)2]n·2npy (4), (H2pam = pamoic acid, 4,4′-bipy = 4,4′-bipyridine, py = pyridine), have been synthesized and characterized by elemental analysis, infrared spectra and X-ray crystallography. Complex 1 is a 2-D coordination polymer constructed from chelating bis-bidentate pam and 4,4′-bipyridine bridging ligands. Complex 2 is a 2-D coordination polymer assembled by bis-monodentate pam and 4,4′-bipyridine, where acetonitrile is filled in the rectangle channels. Both 2-D coordination polymers display undulated (4,4) grid layers as sql topology. Complex 3 displays a 1-D polymeric chain using chelating bis-bidentate pam as bridging ligand. Complex 4 exhibits an interesting bis-monodentate pam-Mn(II) 1-D polymeric chain, in which exist two-type six-coordinated manganese centers. Mn(1) is bound to four pyridine ligands, whereas Mn(2) is combined to two pyridine and two H2O molecules. Their thermal stabilities have been investigated. Cadmium complex 3 displays strong green luminescence with emission maximum at 543 nm. 相似文献
20.
The syntheses and luminescent properties of three novel zinc coordination polymers containing tetrazolyl ligands are described. In situ [2+3] cycloaddition reactions of acetonitrile or p-tolylnitrile with sodium azide in the presence of Zn(ClO(4))(2) as a Lewis acid (Demko-Sharpless tetrazole synthesis method) under hydrothermal (solvothermal) reaction conditions gave [Zn(CH(3)CN(4))(2)](3)(H(2)O) (1) and [Zn(4-MPTZ)(2)] (3) [4-MPTZ = 5-(4-methylphenyl)tetrazole], respectively. On the other hand, [Zn(HCN(4))(2)] (2) was obtained by directly reacting tetrazole with Zn(OAc)(2) under hydrothermal reaction conditions. The structure of 1 shows a super-diamond-like topological network with a diamond subunit as a connecting node. For 2, a diamond-like topological network is also found, but it is 2-fold interpenetrated. The structure of 3 reveals a 2D layered network with a hexagonal net, with the adjacent layers in the network stacked in an ABAB sequence. Photoluminescence studies revealed coordination polymers 1, 2, and 3 exhibit strong blue fluorescent emissions at lambda(max) = 396, 418, and 397 nm, respectively, in the solid state at room temperature. 相似文献