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1.
The reaction of NiCl2 with excess potassium pivalate (KPiv) in ethanol affords the chainpolymeric compound KNi4(Piv)7(OH)2(EtOH)6. In the solid compound, the tetranuclear nickel fragments alternate with potassium atoms. The use of KNi4(Piv)7(OH)2(EtOH)6 in the reaction with Ni(hfac)2 (hfac is the hexafluoroacetylacetonate anion) gave the first polynuclear mixed-ligand complexes [K2Ni6(Piv)7(hfac)3(OH)4(HPiv)2(Me2CO)2]·1.5C7H16, [Ni6(Piv)4(hfac)4(OH)4(Me2CO)4], [K2Ni8(Piv)8(hfac)4(OH)6(H2O)2(Me2CO)6], [Ni8(Piv)10(hfac)2(OH)2(MeO)2(MeOH)2(HPiv)2]·C6H14, and [Ni16(Piv)10(hfac)6(OH)10(MeO)6(MeOH)8(H2O)6]·C6H14 containing both Piv and hfac as the anionic ligands. The molecular and crystal structures of all these compounds were established, and their magnetic properties were studied. All solids containing simultaneously Piv and hfac ligands tend to undergo ferromagnetic ordering with decreasing temperature. The solid [Ni8(Piv)10(hfac)2(OH)2(MeO)2(MeOH)2(HPiv)2]·C6H14 undergoes cooperative magnetic ordering below T c (2.5 K). Dedicated to the 90th anniversary of the L. Ya. Karpov Institute of Physical Chemistry. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1175–1182, June, 2008.  相似文献   

2.
The reaction of cobalt(II) bis(hexafluoroacetylacetonate) (Co(hfac)2) with polynuclear CoII or CoII,III pivalates, [Na2Co4(OH)2(Piv)8(EtOH)4], [Co2(H2O)(Piv)4(HPiv)4], and [CoIII 2CoII 4(O)2(Piv)10(H2O)(THF)3]·1.5THF (Piv is pivalate), affords the previously unknown cobalt compounds containing coordinated Piv and hfac anions in the ligand shell, viz., the dinuclear complex [Na2Co2(hfac)4(Piv)2(Me2CO)4], the tetranuclear complex [Co4(Piv)4(hfac)2(OH)2(HPiv)4]·HPiv, and the tetradecanuclear complex [CoIII 4CoII 10(Piv)10(hfac)4(OH)14(O)2(HPiv)4]·2HPiv·2H2O·3C7H16, respectively. The tetradecanuclear complex has an unusual ability to precipitate nitroxides from solution, due to which the following new heterospin crystalline solids were synthesized: [Co14(Piv)10(hfac)4(OH)14(O)2(H2O)2(HPiv)2]·2NIT-Me·2HPiv·C6H14, [Co14(Piv)10(hfac)4(OH)14(O)2(HPiv)4]·2NIT-Et·2CHCl3, [Co14(Piv)10(hfac)4(OH)14(O)2(HPiv)4]·2NIT-Ph·2C6H14, [Co14(Piv)10(hfac)4(OH)14(O)2(HPiv)4]·2L1·2CH2Cl2, and [Co14(Piv)10(hfac)4(OH)14(O)2(HPiv)4]·2L2·C6H14, where NIT-Me, NIT-Et, and NIT-Ph are 2-imidazoline nitroxides, L1 is 3-imidazoline nitroxide, and L2 is di-tert-butyl nitroxide. The X-ray diffraction study showed that the efficient binding of nitroxides is provided by the specific arrangement of the μ3-OH groups in the [Co14(Piv)10(hfac)4(OH)14(O)2(HPiv)4] molecule, which is spatially complementary for the formation of numerous hydrogen bonds with the nitroxide moiety. The coordination of the nitroxides by terminal cobalt ions is impossible because this would lead to the impermissible spatial overlap of the atoms of the tetradecanuclear moiety and the nitroxide. The spatial characteristics of only NIT-H containing the H atom in position 2 of the 2-imidazoline ring are suitable for the direct coordination of the nitroxide, which made it possible to synthesize the complex [Co14(Piv)10(hfac)4(OH)14(O)2(H2O)4(NIT-H)2]·4HPiv·2H2O.  相似文献   

3.
《Mendeleev Communications》2021,31(5):628-630
Solid phase thermolysis of pivalate complex [Fe3O(Piv)6(HPiv)3]Piv generates the [Fe3O(Piv)6]+ complex cation due to a deficiency of ligands in the coordination sphere of the metal ions. Crystallization of [Fe3O(Piv)6]+ from THF–EtOH leads to the heteroleptic complex [Fe3O(Piv)6(THF)(EtOH)(OH)] · 0.5 THF · 0.5 H2O in 69% yield, while the reaction of [Fe3O(Piv)6]+ with AgNO3 in toluene results in the complex [Fe4Ag4O2(Piv)12] · 2 PhMe with a rare combination of FeIII and AgI atoms. Crystal structures of the two new complexes have been established.  相似文献   

4.
The synthesis and structures of mononuclear Ni(II), Co(II), Mn(II), and Cu(II) pivalates isolated as complex salts NBu4[M(Piv)3] ((NBu4)+ is tetrabutylammonium cation, Piv– is pivalate anion) and polynuclear complexes [Ni6(L)2(HL)2(Piv)6(HPiv)8], (NBu4)2[Co4(Piv)8(AcO)2(H2O)4], NBu4[Co2(Piv)5(H2O)2], and (NBu4)2[Cu4(Piv)8(AcO)2(H2O)2] (L2–, HL–, and AcO– is lactic acid dianion, lactic acid monoanion, and acetate anion, respectively) are discussed. The formation of the compounds is detected during the development of the synthesis of NBu4[M(Piv)3].  相似文献   

5.
The Ce,Mn mixed-metal polynuclear compounds [Ce 3Mn6(O)5(OH)3Piv12Cl2(THF)3]·2THF, [Ce3Mn8(O)8Piv16Cl2(HPiv)2]·C7H16, [Ce10Mn4(O)6(OH)12Piv16Cl2(THF)2]·2THF·2H2O, [CeMn11Cl3(O)8Piv15(H2O)]·CH2Cl2, and [CeMn8(O)8Piv12(HPiv)2(THF)2] were prepared and structurally characterized. The possibility of synthesizing p,d,f-heterospin complexes by replacing coordinated THF molecules by nitroxide molecules was exemplified by the reaction of [Ce3Mn6(O)5(OH)3Piv12Cl2(THF)3]·2THF with nitronyl nitroxides (NIT-R is 2-R-4,4,5,5-tetramethyl-24midazoline-l-oxyl 3-oxide; R is Me or 4-Py). The X-ray diffraction study of these complexes showed that [Ce3Mn6(O)5(OH)3Piv12Cl2(HPiv)(NIT-Me)2] and [CeMn8(O)8Piv12(NIT4-Py) 4] · 2C6H14 have a molecular structure and [Ce3Mn6(O)5(OH)3-Piv12Cl2(NIT-Me)(H2O)] is an infinite chain.  相似文献   

6.
New dinuclear complexes of the types [Ni2(L)(H2O)2] and [Ni2(L)(H2O)6] [H4L = N,N′‐bis(carboxymethyl) dithiooxamide (H4GLYDTO), N,N′‐bis(1‐carboxyethyl) dithiooxamide (H4ALADTO), N,N′‐bis(1‐carboxy‐2‐methylpropyl) dithiooxamide (H4VALDTO) and N,N′‐bis(1‐carboxy‐3‐methylbutyl) dithiooxamide (H4LEUDTO)] have been prepared and characterized by IR and electronic absorption spectroscopy, and the structure of [Ni2(ALADTO)(H2O)6] crystals has been determined by single crystal X‐ray analysis. This compound is composed of discrete dinuclear units in which two NiII atoms with NO4S kernels are linked by a single [ALADTO]4– group that coordinates through its carboxylato oxygen, amino nitrogen and thiolato sulphur atoms. In each dimer unit the two nickel(II) ions in distorted octahedral coordination are separated by 5.863(2) Å The temperature dependence of the magnetic susceptibility of the new compounds was measured over the range 2 to 300 K. In the complexes of [GLYDTO]4– and [ALADTO]4– the two Ni atoms are antiferromagnetically coupled, with J = –23.51(4) and –20.95(8) cm–1, respectively. By constrast, [Ni2(VALDTO)(H2O)2], [Ni2(VALDTO)(H2O)6] and [Ni2(LEUDTO)(H2O)2] remain paramagnetic down to 2 K, with magnetic moment values between 2.8 and 3.3 M.B.  相似文献   

7.
New hexanuclear Fe(III)–Mn(II, III) pivalates [Fe2 III Mn4 II(O)2(Piv)10(HPiv)4] (I) or [Fe4 III Mn2 III(O)2(Piv)12(CH2O2)(HPiv)2] · Et2O (II) are synthesized using the solid-state thermolysis of [Fe2Mn(O)(Piv)6(HPiv)3] (90°С). Complexes I and II differ by the ratio of iron and manganese ions, which depends on the atmospheric composition during thermolysis. The structures of compounds I and II are determined by X-ray diffraction studies. According to the parameters of the Mössbauer spectrum, complex I contains the Fe3+ ions in the high-spin state in the octahedral environment of oxygen atoms.  相似文献   

8.
The new complexes [Mn(Hpchce)2(o-phen)], {2[Mn(pchcm)(o-phen)2]}·7H2O and [Ni(Hpchcm)(o-phen)2]Cl·CH3OH with [N′-(pyridine-4-carbonyl)-hydrazine]-carbodithioic acid ethyl ester (H2pchce) and [N′-(pyridine-4-carbonyl)-hydrazine]-carbodithioic acid methyl ester (H2pchcm) have been synthesized, containing o-phenanthroline (o-phen) as a coligand. These ligands and their complexes have been characterized by elemental analyses, IR, magnetic susceptibility and single crystal X-ray data. H2pchce (2), [Mn(Hpchce)2(o-phen)] (3) {2[Mn(pchcm)(o-phen)2]}·7H2O (4) and [Ni(Hpchcm)(o-phen)2]Cl·CH3OH (5) crystallized in the monoclinic system, space group Pc, C2/c, P21/n and P21/n, respectively. The (N, O) donor sites of the bidentate ligands chelate the Mn(II) and Ni(II) centers forming a five-membered CN2OM ring. The resulting complexes are paramagnetic and have a distorted octahedral geometry.  相似文献   

9.
Reaction of 2,2′-bipyridine (2,2′-bipy) or 1,10-phenantroline (phen) with [Mn(Piv)2(EtOH)]n led to the formation of binuclear complexes [Mn2(Piv)4L2] (L = 2,2′-bipy (1), phen (2); Piv− is the anion of pivalic acid). Oxidation of 1 or 2 by air oxygen resulted in the formation of tetranuclear MnII/III complexes [Mn4O2(Piv)6L2] (L = 2,2′-bipy (3), phen (4)). The hexanuclear complex [Mn6(OH)2(Piv)10(pym)4] (5) was formed in the reaction of [Mn(Piv)2(EtOH)]n with pyrimidine (pym), while oxidation of 5 produced the coordination polymer [Mn6O2(Piv)10(pym)2]n (6). Use of pyrazine (pz) instead of pyrimidine led to the 2D-coordination polymer [Mn4(OH)(Piv)7(µ2-pz)2]n (7). Interaction of [Mn(Piv)2(EtOH)]n with FeCl3 resulted in the formation of the hexanuclear complex [MnII4FeIII2O2(Piv)10(MeCN)2(HPiv)2] (8). The reactions of [MnFe2O(OAc)6(H2O)3] with 4,4′-bipyridine (4,4′-bipy) or trans-1,2-(4-pyridyl)ethylene (bpe) led to the formation of 1D-polymers [MnFe2O(OAc)6L2]n·2nDMF, where L = 4,4′-bipy (9·2DMF), bpe (10·2DMF) and [MnFe2O(OAc)6(bpe)(DMF)]n·3.5nDMF (11·3.5DMF). All complexes were characterized by single-crystal X-ray diffraction. Desolvation of 11·3.5DMF led to a collapse of the porous crystal lattice that was confirmed by PXRD and N2 sorption measurements, while alcohol adsorption led to porous structure restoration. Weak antiferromagnetic exchange was found in the case of binuclear MnII complexes (JMn-Mn = −1.03 cm−1 for 1 and 2). According to magnetic data analysis (JMn-Mn = −(2.69 ÷ 0.42) cm−1) and DFT calculations (JMn-Mn = −(6.9 ÷ 0.9) cm−1) weak antiferromagnetic coupling between MnII ions also occurred in the tetranuclear {Mn4(OH)(Piv)7} unit of the 2D polymer 7. In contrast, strong antiferromagnetic coupling was found in oxo-bridged trinuclear fragment {MnFe2O(OAc)6} in 11·3.5DMF (JFe-Fe = −57.8 cm−1, JFe-Mn = −20.12 cm−1).  相似文献   

10.
The electronic structures of polynuclear different-ligand nickel(ii) complexes [K2Ni6Piv7(hfac)3(OH)4(HPiv)2(Me2CO)2], [Ni6Piv4(hfac)4(OH)4(Me2CO)4], and [Ni8Piv10(hfac)2(OH)2(MeO)2(MeOH)2(HPiv)2] were studied within the framework of the DFT approach. For each complex, the isotropic exchange parameters for all pairs of paramagnetic centers were calculated. Based on the results obtained, models for Heisenberg-Dirac-van Vleck exchange interaction (with minimal number of parameters) were proposed, which can be used to describe the magnetic properties of the compounds under study.  相似文献   

11.
Five new coordination polymers, namely, [Ni2(L)2(4, 4′‐bipy)3)] · H2O]n ( 1 ), [Ni2(L)2(O) (bpp)2]n ( 2 ), [Zn(L)(bib)0.5]n ( 3 ), [Zn(L)(PyBIm)]n ( 4 ), and [Zn3(L)2(OH)(im)]n ( 5 ) [H2L = benzophenone‐2, 4′‐dicarboxylic acid, 4, 4′‐bipy = 4, 4′‐bipyridine, bpp = 1, 3‐bis(4‐pyridyl)propane, PyBIm = 2‐(4‐pyridyl)benzimidazole, and im = imidazole] were synthesized under hydrothermal conditions. Structure determination revealed that compound 1 is a 3D network and exhibits a 4‐connected metal‐organic framework with (42.63.8) topology, whereas compounds 2 , 3 , 4 , and 5 are two‐dimensional layer structures. In compounds 2 – 4 , dinuclear metal clusters are formed through carboxylic groups. In compound 5 , trinuclear metal clusters are formed through μ3‐OH and carboxylic groups. The carboxylic groups exhibit three coordination modes in compounds 1 – 5 : monodentately, bidentate‐chelating, and bis‐monodentately. Furthermore, the luminescent properties for compounds 3 , 4 , and 5 were investigated.  相似文献   

12.
A straightforward synthetic method has been developed to prepare cadmium(II) complexes of 4′-tolyl-2,2′:6′,2″-terpyridine (ttpy) in good yields. These complexes are formulated as {[Cd(ttpy)(NO3)2][Cd2(ttpy)2(NO3)4]} (1), [Cd2(ttpy)2(N3)4]0.5CH3OH?·?0.125H2O (2), and {[Cd(ttpy)(SCN)(CH3COO)][Cd(ttpy)(SCN)2]2} (3). Intermolecular, intramolecular, hydrogen bonding and π–π stacking interactions were observed in the complexes, and are responsible for the arrangement of complexes in the crystal packing and play essential roles in forming different frameworks of 1–3. The antibacterial activities of the synthesized complexes were tested against three gram positive bacteria and three gram negative bacteria.  相似文献   

13.
The coordination compounds [Cd(TBDS)(H2O)2]n ( 1 ) and Cd(TBDS)(bpy)2(H2O) · 3H2O ( 2 ) {H2TBDS = 4‐([4,2′:6′,4′′‐terpyridine]‐4′‐yl)benzene‐1,3‐disulfonic acid, bpy = 2,2′‐bipyridine} were synthesized under hydrothermal conditions. Single crystal X‐ray diffraction analyses revealed that compound 1 is a twofold interpenetrating 3D framework with 4‐connected dia topology, whereas compound 2 is a mononuclear compound, which packed with each other via hydrogen‐bonding interactions to construct a three‐dimensional supramolecular structure, and contained unusual meso‐helical chains. Additionally, the luminescence properties and thermal stabilities of 1 and 2 were investigated.  相似文献   

14.
The heterospin mixed-ligand complex [Ni6(OH)4Piv4(hfac)4(NIT-Ph)2] (1) (NIT-Ph is 4,4,5,5-tetramethyl-2-phenyl-4,5-dihydro-1H-imidazol-1-oxyl 3-oxide, hfac is hexafluoroacetylacetonate, and Piv is pivalate) was synthesized. The method for the synthesis of complex 1 is based on the replacement of acetone molecules in the hexanuclear complex containing the hexafluoroacetylacetonate and pivalate ligands [Ni6(OH)4Piv4(hfac)4(Me2CO)4] by NIT-Ph molecules. Two monodentate NIT-Ph molecules replace four acetone molecules, because the coordination of the O atom of the nitroxide group results in the blocking of one of the positions in the coordination environment of NiII the access to which is hindered by the phenyl ring of NIT-Ph. As a result, these ions are in a square-pyramidal environment unusual of NiII. In the low-temperature range, the dependence of the magnetization of 1 on the magnetic field is described by the Brillouin function. The reaction of [Ni6Piv4(hfac)4(OH)4(Me2CO)4] with the nitronyl nitroxide radicals 4,4,5,5-tetramethyl-2-(4-pyridyl)-4,5-dihydro-1H-imidazol-1-oxyl 3-oxide (NIT-p-Py) or 4,4,5,5-tetramethyl-2-(1-methyl-1H-imidazol-5-yl)-4,5-dihydro-1H-imidazol-1-oxyl 3-oxide (NIT-Iz) containing the pyridine or 1-methylimidazol-5-yl substituent, respectively, in the side chain is accompanied by the decomposition of the polynuclear fragment and affords the mononuclear complexes Ni(hfac)2(NIT-p-Py)2 and Ni(hfac)2(NIT-Iz)2, respectively. The reaction of 4,4,5,5-tetramethyl-2-(1-methyl-1H-imidazol-5-yl)-4,5-dihyd-ro-1H-imidazol-1-oxyl (Im-Iz), which is the imine analog of NIT-Iz, with [Ni6Piv4(hfac)4(OH)4(Me2CO)4] afforded the decanuclear complex [Ni10(OH)8Piv4(hfac)8(Im-Iz)2(H2O)6]. The molecular and crystal structures of all heterospin compounds were determined, and the magnetic properties of all compounds were investigated in the 2–300 K temperature range.  相似文献   

15.
Vaporization of cobalt(II) pivalate [Co(Piv)2] (1, HPiv = HO2CCMe3) and cobalt(II) oxopivalate [Co4O(Piv)6] (2) complexes has been studied by Knudsen effusion technique in combination with mass-spectral analysis of gas phase composition. The congruent sublimation of the prepared compounds has occurred, it has been accompanied by partial thermal decomposition in the case of complex 1. Saturated vapor over complex 1 has been found to consist mainly of monomeric Co(Piv)2, dimeric Co2(Piv)4, and small amount of tetrameric Co4(Piv)8 molecules, as well as Co4O(Piv)6, CO2, and 2,2,4,4-tetramethylpentanone ones. Saturated vapor over complex 2 contains only Co4O(Piv)6 species. The absolute values of partial pressure and sublimation enthalpies of gas phase components have been calculated.  相似文献   

16.
Reaction of the preformed cluster [Mn6O2(Piv)10(4-Me-py)2.5(PivH)1.5] with Nd(NO3)3.6H2O, N-butyldiethanolamine (bdeaH2) and ferrocene-1,1′-dicarboxylic acid (fcdcH2) resulted in the formation of the first 3d–4f complex incorporating organometallic ferrocene [Mn4Nd4(OH)4(fcdc)2(Piv)8(bdea)4]·H2O; we report the X-ray structure and preliminary magnetic studies of this high-nuclearity cluster.  相似文献   

17.
Two coordination polymers based on vanadium-substituted Keggin polyoxotungstophosphates as bridging ligands, {[Ni(4,4′-bipy)1.5(OH)(H2O)]2[H3PW10V2O40]}·4H2O (4,4′-bpy = 4,4′-bipyridine) 1 and {[Ni(dpa)2][Ni(dpa)(H2O)3]2[PW9V3O40]}·4H2O (dpa = 2,2′-dipyridylamine) 2, have been obtained by hydrothermal reactions and characterized by elemental analysis, IR, XRD, TGA and single-crystal X-ray Diffraction analysis. Compound 1 is a 2D layered structure built from 1D infinite zigzag {Ni2(4,4′-bipy)3(OH)2(H2O)2}n2+ chains bridged via [H3PW10V2O40]2− anions. Compound 2 exhibits a one-dimensional chain-like structure constructed from [Ni(dpa)2]2+ fragments bridged via bis-supported Keggin polyoxoanions [Ni(dpa)(H2O)3]2[PW9V3O40]2−. The two examples demonstrate that vanadium-substituted Keggin polyoxometalates have greater coordination capability.  相似文献   

18.
A study on the influence of the cation coordination number, number of Lewis acid centers, concurrent existence of Lewis base sites, and structure topology on the catalytic activity of six new indium MOFs, has been carried out for multicomponent reactions (MCRs). The new indium polymeric frameworks, namely [In8(OH)6(popha)6(H2O)4]?3 H2O ( InPF‐16 ), [In(popha)(2,2′‐bipy)]?3 H2O ( InPF‐17 ), [In3(OH)3(popha)2(4,4′‐bipy)]?4 H2O ( InPF‐18 ), [In2(popha)2(4,4′‐bipy)2]?3 H2O ( InPF‐19 ), [In(OH)(Hpopha)]?0.5 (1,7‐phen) ( InPF‐20 ), and [In(popha)(1,10‐phen)]?4 H2O ( InPF‐21 ) (InPF=indium polymeric framework, H3popha=5‐(4‐carboxy‐2‐nitrophenoxy)isophthalic acid, phen=phenanthroline, bipy=bipyridine), have been hydrothermally obtained by using both conventional heating (CH) and microwave (MW) procedures. These indium frameworks show efficient Lewis acid behavior for the solvent‐free cyanosilylation of carbonyl compounds, the one pot Passerini 3‐component (P‐3CR) and the Ugi 4‐component (U‐4CR) reactions. In addition, InPF‐17 was found to be a highly reactive, recyclable, and environmentally benign catalyst, which allows the efficient synthesis of α‐aminoacyl amides. The relationship between the Lewis base/acid active site and the catalytic performance is explained by the 2D seven‐coordinated indium framework of the catalyst InPF‐17 . This study is an attempt to highlight the main structural and synthetic factors that have to be taken into account when planning a new, effective MOF‐based heterogeneous catalyst for multicomponent reactions.  相似文献   

19.
Investigation of the Hydrolytic Build‐up of Iron(III)‐Oxo‐Aggregates The synthesis and structures of five new iron/hpdta complexes [{FeIII4(μ‐O)(μ‐OH)(hpdta)2(H2O)4}2FeII(H2O)4]·21H2O ( 2 ), (pipH2)2[Fe2(hpdta)2]·8H2O ( 4 ), (NH4)4[Fe6(μ‐O)(μ‐OH)5(hpdta)3]·20.5H2O ( 5 ), (pipH2)1.5[Fe4(μ‐O)(μ‐OH)3(hpdta)2]·6H2O ( 7 ), [{Fe6(μ3‐O)2(μ‐OH)2(hpdta)2(H4hpdta)2}2]·py·50H2O ( 9 ) are described and the formation of these is discussed in the context of other previously published hpdta‐complexes (H5hpdta = 2‐Hydroxypropane‐1, 3‐diamine‐N, N, N′, N′‐tetraacetic acid). Terminal water ligands are important for the successive build‐up of higher nuclearity oxy/hydroxy bridged aggregates as well as for the activation of substrates such as DMA and CO2. The formation of the compounds under hydrolytic conditions formally results from condensation reactions. The magnetic behaviour can be quantified analogously up to the hexanuclear aggregate 5 . The iron(III) atoms in 1 ‐ 7 are antiferromagnetically coupled giving rise to S = 0 spin ground states. In the dodecanuclear iron(III) aggregate 9 we observe the encapsulation of inorganic ionic fragments by dimeric{M2hpdta}‐units as we recently reported for AlIII/hpdta‐system.  相似文献   

20.
The homochiral coordination polymers [Cu4(CH3OH)(H2O)4(Hbtb)(S-mal)2]?4H2O and [Cu4(CH3OH)(H2O)4(Hbtb)(R-mal)2]?4H2O were synthesized by heating S- or R-malic acid (H3mal), 4,4′,4″-benzene-1,3,5-triyltris(benzoic acid) (H3btb), and copper(II) acetate in an aqueous methanolic solution. The reaction with copper(II) nitrate in aqueous dioxane afforded the coordination framework [Cu6(C4H8O2)3(H2O)3(btb)4]?4C4H8O2?10H2O, which does not contain chiral ligands. The compositions and crystal structures of the new compounds were determined by single-crystal X-ray diffraction and confirmed by X-ray powder diffraction, IR spectroscopy, thermogravimetric and elemental analysis.  相似文献   

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