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1.
《中国化学快报》2023,34(7):107773
The integration of lanthanide (Ln) ions and polyoxoniobates (PONbs) is challenging, and the known Ln-substituted PONbs are still scarce. This work introduces high-nuclear iso-Ln-oxo clusters into the PONb system. The first series of high-nuclear Ln-oxo clusters encapsulated heterometallic polyoxoniobates H9[Na(H2O)4][Cu(en)2]10{Ln6(μ3-OH)6(SiNb18O54)3}·18H2O (1-Ln, en = ethylenediamine, Ln = Dy, Gd, Tb, Ho, Er, Tm, Yb, Lu) based on flower-like {Ln6(μ3-OH)6(SiNb18O54)3} ({Ln6Si3Nb54}) clusters have been successfully synthesized via one-pot hydrothermal synthesis strategy. The flower-like polyoxoanion {Ln6Si3Nb54} is consisted of three heteropolyoxoniobate {SiNb18O54} clusters and one unique planar equilateral triangle-shaped {Ln6(μ3-OH)6} cluster, which presents the highest nuclear iso-Ln-oxo cluster in PONb chemistry. In {Ln6(μ3-OH)6} cluster, each pair of μ3-OH groups link three Dy3+ ions to form a small approximate equilateral triangle-shaped {Dy3(OH)2} cluster. Furthermore, the three {Dy3(OH)2} clusters comprise a bigger approximate equilateral triangle-shaped {Dy6(μ3-OH)6} cluster. The reported hexanuclear {Ln6} cluster skeletons are mostly octahedral, however, such equilateral triangle-shaped skeleton of the hexanuclear Ln-oxo cluster is first observed. The 1-Dy exhibits good water vapor adsorption capacity and ferromagnetic properties. 相似文献
2.
Reactions of lanthanide nitrate, oxalate sodium and 2-pyridylmethylphosphonic acid (2-pmpH2) under hydrothermal conditions result in five new lanthanide oxalatophosphonates with two types of structures. Compounds [Ln4(ox)5(2-pmpH)2(H2O)7]·5H2O [Ln3+=Gd (1), Tb (2), Dy (3); ox2−=C2O42−] exhibit a double layer structure, made up of net-like {Ln4(ox)5}n layers containing Ln10(ox)10 rings which are connected by 2-pmpH‐. While compounds [Ln4(ox)5(2-pmpH)2(H2O)6]·6H2O [Ln3+=Ho (4), Yb (5)] display a three-dimensional framework structure in which the {Ln4(ox)5}n layers are cross-linked by 2-pmpH. The solid state luminescent and magnetic properties are investigated. 相似文献
3.
I. V. Kalinina D. G. Samsonenko A. V. Gerasimenko V. P. Fedin 《Russian Chemical Bulletin》2004,53(10):2135-2141
The reactions of anionic molybdenum and tungsten cyanide cuboidal clusters with CuII and MnII salts afforded two new cyanide-bridged heterometallic coordination polymers with the composition [{Cu2(dien)2(CN)}2{Mo4Te4(CN)12}]?14.5H2O (1) and (H3O)3K[{Mn(H2O)2}2{Mn(H2O)2(NO3)}4{W4Te4(CN)12}2]·8H2O (2). The structures of these compounds were established by X-ray diffraction analysis. Compound 1 has a layered structure, in which the cuboidal cluster fragments {Mo4Te4(CN)12}6? are linked to the copper atoms of the dinuclear fragments {(H2O)(dien)Cu(μ-CN)Cu(dien)(H2O)} through the bridging CN groups. Coordination polymer 2 has a framework structure, in which the cluster fragments {W4Te4(CN)12}6? are linked to the manganese(II) aqua complexes of two types, viz., the dinuclear fragment {Mn(μ2-H2O)2Mn} and the tetranuclear cyclic fragment {(H2O)2Mn(μ2-NO3)}4, through the bridging CN groups. 相似文献
4.
Fabrice GoubardAlain Tabuteau 《Journal of solid state chemistry》2002,167(1):34-40
The properties of a series of lanthanide hexacyanoferrate(II) n-hydrates were studied by thermal analysis, IR spectroscopy and X-ray diffraction. Thermal analysis results show that there are three kinds of complexes in this series, KLn[Fe(CN)6]·4 H2O (Ln=La-Nd), KSm[Fe(CN)6]·3H2O and KLn[Fe (CN)6]·3.5H2O (Ln=Eu-Lu). On the basis of IR spectra, only two different types of complexes show obvious differences. Indeed for the tetrahydrates, there is one OH stretching band; on the other hand, for the samarium phase and the 3.5 hydrates a splitting of HOH stretching mode is observed. The splitting of the H2O band is correlated to a symmetry modification. The crystal structures of the three complexes KLn[Fe(CN)6]·3.5H2O (Ln=Eu, Er and Lu) were determined; they belong to orthorhombic symmetry (space group Cmcm). Heat-treated powders have been investigated by X-ray analysis which show the formation of thin needles of LnFeO3 at 600°C. 相似文献
5.
Helle Svendsen Jacob Overgaard Dr. Marie A. Chevallier Eric Collet Prof. Dr. Yu‐Sheng Chen Dr. Frank Jensen Prof. Dr. Bo B. Iversen Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2010,16(24):7215-7223
Single‐crystal X‐ray diffraction measurements have been carried out on [Nd(dmf)4(H2O)3(μ‐CN)Fe(CN)5]?H2O ( 1 ; dmf=dimethylformamide), [Nd(dmf)4(H2O)3(μ‐CN)Co(CN)5]?H2O ( 2 ), [La(dmf)4(H2O)3(μ‐CN)Fe(CN)5]?H2O ( 3 ), [Gd(dmf)4(H2O)3(μ‐CN)Fe(CN)5]?H2O ( 4 ), and [Y(dmf)4(H2O)3(μ‐CN)Fe(CN)5]?H2O ( 5 ), at 15(2) K with and without UV illumination of the crystals. Significant changes in unit‐cell parameters were observed for all the iron‐containing complexes, whereas 2 showed no response to UV illumination. Photoexcited crystal structures have been determined for 1 , 3 , and 4 based on refinements of two‐conformer models, and excited‐state occupancies of 78.6(1), 84(6), and 86.6(7) % were reached, respectively. Significant bond‐length changes were observed for the Fe–ligand bonds (up to 0.19 Å), the cyano bonds (up to 0.09 Å), and the lanthanide–ligand bonds (up to 0.10 Å). Ab initio theoretical calculations were carried out for the experimental ground‐state geometry of 1 to understand the electronic structure changes upon UV illumination. The calculations suggest that UV illumination gives a charge transfer from the cyano groups on the iron atom to the lanthanide ion moiety, {Nd(dmf)4(H2O)3}, with a distance of approximately 6 Å from the iron atom. The charge transfer is accompanied by a reorganization of the spin state on the {Fe(CN)6} complex, and a change in geometry that produces a metastable charge‐transfer state with an increased number of unpaired electrons, thus accounting for the observed photomagnetic effect. 相似文献
6.
I. I. Seifullina A. B. Ilyukhin E. E. Martsinko E. A. Chebanenko V. S. Sergienko 《Russian Journal of Inorganic Chemistry》2014,59(4):298-302
Four heterometallic tartratogermanate complexes, namely [Cu2Ge2(Tart)3(H2O)10] n · 3nH2O and (H3O)[LnGe2(Tart)3(H2O)6] · nH2O (Ln3+ = Gd, n = 3.5; Tm, n = 3; Yb, n = 3), have been prepared via the reaction between germanium tetrachloride and D-tartaric acid (H4Tart) in aqueous acetic acid. All complexes contain {Ge2(Tart)3} n 4n- polymer chains. The Cu2+ and Ln3+ atoms coordinate only Tart carbonyl oxygen atoms. 相似文献
7.
A visible light-induced magnetization change of the 3d-4f heterometallic, [Nd(DMF)4(H2O)3(μ-NC)Co(CN)5]·H2O (DMF=N,N-dimethylformamide), is observed and described. The plots of χMT versus T of the complex showed that the χMT values, after visible light illumination, were enhanced by about 25% as compared to before irradiation in the temperature range of 5-40 K. 相似文献
8.
The Building Block [FeIII(pzphen)(CN)4]– and its Lanthanide Complexes: Synthesis,Crystal Structure,and Magnetic Properties
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Jian‐Qing Tao Wen‐Wen Ju Zhou Zhou Li‐Yong Jia Ning‐Ning Chen Yun‐Shan Xue Jun Wang Xing‐Cai Huang 《无机化学与普通化学杂志》2016,642(24):1466-1471
The cyanide building block [FeIII(pzphen)(CN)4]– and its four lanthanide complexes [{FeIII(pzphen)(CN)4}2LnIII(H2O)5(DMF)3] · (NO3) · 2(H2O) · (CH3CN) [Ln = Nd ( 1 ), Sm ( 2 ), DMF = dimethyl formamide] and [{FeIII(pzphen)(CN)4}2LnIII(NO3)(H2O)2(DMF)2](CH3CN) [Ln = Gd ( 3 ), Dy ( 4 )] were synthesized and structurally characterized by single‐crystal X‐ray diffraction. Compounds 1 and 2 are ionic salts with two [FeIII(pzphen)(CN)4]– cations and one LnIII ion, but compounds 3 and 4 are cyano‐bridged FeIII‐LnIII heterometallic 3d‐4f complexes exhibiting a trinuclear structure in the same conditions. Magnetic studies show that compound 3 is antiferromagnetic between the central FeIII and GdIII atoms. Furthermore, the trinuclear cyano‐bridged FeIII2DyIII compound 4 displays no single‐molecular magnets (SMMs) behavior by the alternating current magnetic susceptibility measurements. 相似文献
9.
Heterotrimetallic Coordination Polymers: {CuIILnIIIFeIII} Chains and {NiIILnIIIFeIII} Layers: Synthesis,Crystal Structures,and Magnetic Properties
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Dr. Maria‐Gabriela Alexandru Dr. Diana Visinescu Prof. Marius Andruh Dr. Nadia Marino Dr. Donatella Armentano Dr. Joan Cano Prof. Francesc Lloret Prof. Miguel Julve 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(14):5429-5446
The use of the [FeIII(AA)(CN)4]? complex anion as metalloligand towards the preformed [CuII(valpn)LnIII]3+ or [NiII(valpn)LnIII]3+ heterometallic complex cations (AA=2,2′‐bipyridine (bipy) and 1,10‐phenathroline (phen); H2valpn=1,3‐propanediyl‐bis(2‐iminomethylene‐6‐methoxyphenol)) allowed the preparation of two families of heterotrimetallic complexes: three isostructural 1D coordination polymers of general formula {[CuII(valpn)LnIII(H2O)3(μ‐NC)2FeIII(phen)(CN)2 {(μ‐NC)FeIII(phen)(CN)3}]NO3 ? 7 H2O}n (Ln=Gd ( 1 ), Tb ( 2 ), and Dy ( 3 )) and the trinuclear complex [CuII(valpn)LaIII(OH2)3(O2NO)(μ‐NC)FeIII(phen)(CN)3] ? NO3 ? H2O ? CH3CN ( 4 ) were obtained with the [CuII(valpn)LnIII]3+ assembling unit, whereas three isostructural heterotrimetallic 2D networks, {[NiII(valpn)LnIII(ONO2)2(H2O)(μ‐NC)3FeIII(bipy)(CN)] ? 2 H2O ? 2 CH3CN}n (Ln=Gd ( 5 ), Tb ( 6 ), and Dy ( 7 )) resulted with the related [NiII(valpn)LnIII]3+ precursor. The crystal structure of compound 4 consists of discrete heterotrimetallic complex cations, [CuII(valpn)LaIII(OH2)3(O2NO)(μ‐NC)FeIII(phen)(CN)3]+, nitrate counterions, and non‐coordinate water and acetonitrile molecules. The heteroleptic {FeIII(bipy)(CN)4} moiety in 5 – 7 acts as a tris‐monodentate ligand towards three {NiII(valpn)LnIII} binuclear nodes leading to heterotrimetallic 2D networks. The ferromagnetic interaction through the diphenoxo bridge in the CuII?LnIII ( 1 – 3 ) and NiII?LnIII ( 5 – 7 ) units, as well as through the single cyanide bridge between the FeIII and either NiII ( 5 – 7 ) or CuII ( 4 ) account for the overall ferromagnetic behavior observed in 1 – 7 . DFT‐type calculations were performed to substantiate the magnetic interactions in 1 , 4 , and 5 . Interestingly, compound 6 exhibits slow relaxation of the magnetization with maxima of the out‐of‐phase ac signals below 4.0 K in the lack of a dc field, the values of the pre‐exponential factor (τo) and energy barrier (Ea) through the Arrhenius equation being 2.0×10?12 s and 29.1 cm?1, respectively. In the case of 7 , the ferromagnetic interactions through the double phenoxo (NiII–DyIII) and single cyanide (FeIII–NiII) pathways are masked by the depopulation of the Stark levels of the DyIII ion, this feature most likely accounting for the continuous decrease of χM T upon cooling observed for this last compound. 相似文献
10.
《Polyhedron》1999,18(23):3019-3025
The reaction of [Cu(dien)(H2O)](NO3)2 with K3[Co(CN)6] leads to the cyano-bridged heteropolynuclear complex, [{(Cu(dien))2Co(CN)6}n][Cu(dien)(H2O)Co(CN)6]n·5nH2O, {Cu3Co2}, whose crystal structure has been solved. The structure consists of two distinct ionic units, namely one-dimensional cationic chains [{(Cu(dien))2Co(CN)6}n]n+, and discrete binuclear anionic entities [(H2O)(dien)Cu–NC–Co(CN)5]−. The cryomagnetic investigation of the title compound reveals a very weak antiferromagnetic coupling between the Cu(II) ions within the cationic chain (J=−1.02 cm−1, g=2.14). The complete elimination of the water molecules from the isomorphous {Cu3Co2}, {Cu3Fe2} and {Cu3Cr2} complexes causes the modification of the magnetic properties. The most dramatic one is observed with the Cu(II)–Fe(III) system, where the magnetic behavior changes from ferro- to antiferromagnetic. The dehydrated chromium derivative preserves the ferromagnetic coupling, which is observed at lower temperatures (below 30 K) in comparison with the parent compound (below 150 K). 相似文献
11.
《无机化学与普通化学杂志》2018,644(18):1108-1114
Five new 4,5‐dichlorophthalate (dcpa)‐extended lanthanide coordination polymers (CPs) with formulas [Ln2(H2O)(dcpa)3]n (Ln = Tb for 1 , Sm for 2 , Pr for 3 , and Nd for 4 ) and [Yb(H2O)2(dcpa)(Hdcpa)]n ( 5 ) were solvothermally synthesized. Structural determinations demonstrate that CPs 1 – 4 are crystallographically isostructural, exhibiting an infinite two‐dimensional layer with dimeric {Ln2(COO)3} subunits extended by aromatic skeleton of fully deprotonated dcpa2– connectors. In contrast, complex 5 features a one‐dimensional broad ribbon with centrosymmetric {Yb2(COO)2} subunits propagated by pairs of ditopic dcpa2– ligands. Interestingly, the anionic dcpa2– connector can serve as a good antenna ligand to sensitize the characteristic emissions of the different LnIII ions in both the ultraviolet (for 1 – 3 ) and near‐infrared (for 4 and 5 ) regions. 相似文献
12.
Crystalline cobalticyanides LnCoIII(CN)6·nH2O with Ln = La,…, Lu, Y have been synthesized by a double-infusion technique. In analogy to the Cr and Fe compounds, the large rare-earth ions form a hexagonal modification while the smaller ions lead to the orthorhombic structure with 4H2O. Experiments show that no magnetic ordering occurs down to 1°K. The Stark splitting of the J ground state due to the crystalline field is analyzed for the Ce and Sm compounds. 相似文献
13.
Olga A. EfremovaYuri V. Mironov Natalia V. KuratievaVladimir E. Fedorov 《Polyhedron》2011,30(8):1404-1411
The reactions of aqueous solutions of the tetrahedral cluster anions [Re4Q4(CN)12]4− (Q = S, Se) with lanthanide chlorides resulted in the crystallization of the formed compounds into two main structural types [{Ln(H2O)4(H2O)2/3Cl1/3}3{Re4Q4(CN)12}2]·2H2O (Ln = La-Gd, Q = S, Se) and K0.5(H)0.5[{Ln(H2O)4}{Re4S4(CN)12}]·nH2O or (H)[{Ln(H2O)4}{Re4Se4(CN)12}]·nH2O (Ln = Tb-Lu). Compounds of the first type crystallize in the hexagonal crystal system (space group Р63/m) and they have a three-dimensional polymeric structure; compounds of the second type crystallize in the orthorhombic crystal system (space group Cmcm) and they have a two-dimensional crystal structure due to the polymeric anion {[{Ln(H2O)4}{Re4Q4(CN)12}]−}∞∞. 相似文献
14.
Olga A. EfremovaYakov M. Gayfulin Yuri V. Mironov Natalia V. KuratievaAnton I. Smolentsev Vladimir E. Fedorov 《Polyhedron》2012,31(1):515-523
The reaction of the cluster salt K4[Re4Te4(CN)12]·5H2O with NdCl3·6H2O was studied in either an acidic medium (HCl) or in a water solution in the presence of the following organic agents: hexafluoroacetylacetonate, 2,2′-bipyridine or 1,10-phenanthroline (phen). The crystal structures of four new compounds have been solved by single crystal X-ray diffraction analysis: (H)[{Nd(H2O)5}{Re4Te4(CN)12}]·5.5H2O (1) (space group P21/c, framework structure), K2[{Nd(H2O)7}2{Re4Te4(CN)12}2]·8H2O (2) (space group С2/c, isolated structure), K0.5H0.5[{Nd(H2O)5}{Re4Te4(CN)12}]·3H2O (3) (space group Сmcm, layered structure) and (phenH)[{Nd(H2O)2(phen)2}{Re4Te4(CN)12}]·11H2O (4) (space group С2/c, chain structure). 1,10-Phenanthroline was found to have been incorporated into the structure of compound 4, whilst hexafluoroacetylacetonate and 2,2′-bipyridine did not enter the structures of 2 and 3. It was shown that the structures of compounds 2-4 differ dramatically from that found for compound 1, which was obtained in the absence of the organic agents. 相似文献
15.
Chemistry of Dimesityl Iron. X. Mesityl Iron Complexes [FeMes(X)]2 with a Central {Fe2(μ-Mes)2} Unit (Mes = C6H2-2,4,6-(CH3)3) Dimeric complexes [{MesFe(OAryl)}2] with coordination number (CN) of 3 are obtained from Fe2Mes4 1 by partial acidolyses with 2,6-di-tert-butyl-substituted phenols (HOAryl). 1 reacts with 1,3-diketones in a molar ratio of 1:2 to [{MesFe(diketonate)}2] with CN 4. A central {Fe2(μ-Mes)2}-unit with short Fe—Fe distances of 2.56 to 2.63 Å ( 1: 2.615 Å) is found in both types of complexes. The mixed ligand complexes react with an excess of phenol or diketone to {Fe(OAryl)2} or {Fe(diketonate)2}, respectively. 1 reacts with HOAryl in the molar ratio of 1:1 to [Fe2(μ-Mes)2Mes(OAryl)]. The structures of [Fe2(μ-Mes)2(OC6H2-2,6-tBu2-4-CH3)2] ( 3 ), [Fe2(μ-Mes)2Mes(OC6H2-2,4,6-tBu3)] ( 5 ) and [Fe2(μ-Mes)2{(tBuCO)2CH}2] ( 9 ) are presented. 相似文献
16.
Dr. Min‐Xia Yao Qi Zheng Kang Qian Prof. Dr. You Song Prof. Dr. Song Gao Prof. Dr. Jing‐Lin Zuo 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(1):294-303
By using the node‐and‐spacer approach in suitable solvents, four new heterotrimetallic 1D chain‐like compounds (that is, containing 3d–3d′–4f metal ions), {[Ni(L)Ln(NO3)2(H2O)Fe(Tp*)(CN)3] ? 2 CH3CN ? CH3OH}n (H2L=N,N′‐bis(3‐methoxysalicylidene)‐1,3‐diaminopropane, Tp*=hydridotris(3,5‐dimethylpyrazol‐1‐yl)borate; Ln=Gd ( 1 ), Dy ( 2 ), Tb ( 3 ), Nd ( 4 )), have been synthesized and structurally characterized. All of these compounds are made up of a neutral cyanide‐ and phenolate‐bridged heterotrimetallic chain, with a {? Fe? C?N? Ni(? O? Ln)? N?C? }n repeat unit. Within these chains, each [(Tp*)Fe(CN)3]? entity binds to the NiII ion of the [Ni(L)Ln(NO3)2(H2O)]+ motif through two of its three cyanide groups in a cis mode, whereas each [Ni(L)Ln(NO3)2(H2O)]+ unit is linked to two [(Tp*)Fe(CN)3]? ions through the NiII ion in a trans mode. In the [Ni(L)Ln(NO3)2(H2O)]+ unit, the NiII and LnIII ions are bridged to one other through two phenolic oxygen atoms of the ligand (L). Compounds 1 – 4 are rare examples of 1D cyanide‐ and phenolate‐bridged 3d–3d′–4f helical chain compounds. As expected, strong ferromagnetic interactions are observed between neighboring FeIII and NiII ions through a cyanide bridge and between neighboring NiII and LnIII (except for NdIII) ions through two phenolate bridges. Further magnetic studies show that all of these compounds exhibit single‐chain magnetic behavior. Compound 2 exhibits the highest effective energy barrier (58.2 K) for the reversal of magnetization in 3d/4d/5d–4f heterotrimetallic single‐chain magnets. 相似文献
17.
The thermal dehydration-decomposition of Ln2(SeO4)3·nH2O (wheren=12 forLn=Pr, Nd andn=8 forLn=Sm) and PrxLn2−x(SeO4)3·nH2O (wheren=12 forx=1.0 andLn=Nd;n=8 forx=0.2 and 1.0 in case ofLn=Sm) have been reported.
Zusammenfassung Die thermische Dehydratation-Zersetzung von Ln2(SeO4)3·nH2O (mitn=12 fürLn=Pr, Nd undn=8 fürLn=Sm) und PrxLn2−x(SeO4)3·nH2O (mitn=12 fürx=1.0 undLn=Nd;n=8 fürx=0.2 und 1.0 in Falle vonLn=Sm) wurde beschrieben.相似文献
18.
Valentina D. Sasnovskaya Leokadiya V. Zorina Sergey V. Simonov Artem D. Talantsev Eduard B. Yagubskii 《Molecules (Basel, Switzerland)》2022,27(23)
Four new heterometallic complexes combining [MII(H2dapsc)]2+ cations with the chelating H2dapsc {2,6-diacetylpyridine-bis(semicarbazone)} Schiff base ligand and [Cr(CN)6]3− anion were synthesized: {[MII(H2dapsc)]CrIII(CN)6K(H2O)2.5(EtOH)0.5}n·1.2n(H2O), M = Mn (1) and Co (2), {[Mn(H2dapsc)]2Cr(CN)6(H2O)2}Cl·H2O (3) and {[Co(H2dapsc)]2Cr(CN)6(H2O)2}Cl·2EtOH·3H2O (4). In all the compounds, M(II) centers are seven-coordinated by N3O2 atoms of H2dapsc in the equatorial plane and N or O atoms of two apical –CN/water ligands. Crystals 1 and 2 are isostructural and contain infinite negatively charged chains of alternating [MII(H2dapsc)]2+ and [CrIII(CN)6]3− units linked by CN-bridges. Compounds 3 and 4 consist of centrosymmetric positively charged trimers in which two [MII(H2dapsc)]2+ cations are bound through one [CrIII(CN)6]3− anion. All structures are regulated by π-stacking of coplanar H2dapsc moieties as well as by an extensive net of hydrogen bonding. Adjacent chains in 1 and 2 interact also by coordination bonds via a pair of K+ ions. The compounds containing MnII (1, 3) and CoII (2, 4) show a significant difference in magnetic properties. The ac magnetic measurements revealed that complexes 1 and 3 behave as a spin glass and a field-induced single-molecule magnet, respectively, while 2 and 4 do not exhibit slow magnetic relaxation in zero and non-zero dc fields. The relationship between magnetic properties and non-covalent interactions in the structures 1–4 was traced. 相似文献
19.
M. S. Tarasenko N. G. Naumov D. Yu. Naumov N. V. Kuratieva V. E. Fedorov 《Russian Journal of Coordination Chemistry》2006,32(7):494-503
Interaction of salts of the cluster anions {Re [Re6Q8(CN)6]4?/3? (Q = Se, Te) with Nd salts in the presence of 2,2′-bipyridyl (Bipy) ligand brings about new coordination polymers: Pr 4 n N[{Nd(Bipy)(H2O)4} {Re6Se8(CN)6}] · 2H2O (I) (space group C2/c, a = 18.2918(16) Å, b = 14.9972(13) Å, c = 37.513(3) Å, β = 102.046(4)°, V = 10064.2(15) Å3, Z = 8), [{Nd(Bipy)2(H2O)} {Re6Se8(CN)6}] (II) (space group C2/c, a = 15.8668(3) Å, b = 13.5403(3) Å, c = 20.5189(4) Å, β = 110.135(1)°, V = 4138.89(15) Å3, Z = 4), and [{Nd(Bipy)(EtOH)(H2O)4}{Re6Te8(CN)6}] · EtOH (III) (space group $P\bar 1$ , a = 9.4733(6) Å, b = 12.5326(8) Å, c = 17.2374(11) Å, α = 96.561(2)°, β = 90.310(2)°, γ = 94.876(2)°, V = 4138.89(15) Å3, Z = 4). The compounds synthesized are characterized by single-crystal X-ray diffraction and IR methods. Compounds I and III have layered (2D) structures, compound II is a framework (3D) polymer. 相似文献
20.
A series of Ln–Ni heterometallic coordination polymers, {[Ln2Ni(MIDA)4(H2O)6](H2O)4} (Ln = La ( 1 ), Ce ( 2 ), Pr ( 3 ), and Nd ( 4 ); H2MIDA = N‐methyl‐iminodiacetic acid), were obtained under hydrothermal conditions. Single crystal X‐ray diffraction revealed that they feature two‐dimensional isomorphic frameworks, which could be viewed as the construction by one‐dimensional {Ln}n chain connecting by bridges of [Ni(MIDA)2]2. The magnetic measurements reveal that compounds 2 – 4 exhibit antiferromagnetic properties. TGA results indicate compounds 1 and 4 have good thermostability with the critical temperature of 375 °C. 相似文献