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1.
Three lanthanide coordination polymers constructed from infinite rod‐shaped secondary building units (SBUs), [Nd 2(H 2O) 2( cis‐chdc) 2( trans‐chdc)]?2H 2O ( 1 ), Nd 2(H 2O) 4( trans‐chdc) 3 ( 2 ), and [Sm 2(H 2O) 2( cis‐chdc)( trans‐chdc) 2]?4H 2O ( 3 ) (chdcH 2=1,4‐cyclohexanedicarboxylic acid), were hydrothermally synthesized and structurally characterized. The structures of 1 – 3 are modulated by different ratios of the cis and trans configurations of chdc 2? ligands, which was achieved by temperature control in the hydrothermal reactions. Crystal‐structure analysis revealed that 1 is a four‐connected pcu‐type rod packing network built from cross‐linking of rod‐shaped neodymium–oxygen SBUs by cis‐ and trans‐chdc 2? ligands in a 2:1 ratio, 2 displays a complicated six‐connected hex‐type rod packing structure built by connection of rod‐shaped neodymium–oxygen SBUs and trans‐chdc 2? ligands, and 3 features an unprecedented five‐connected rod packing pattern constructed from rod‐shaped samarium–oxygen SBUs and cis‐ and trans‐chdc 2? ligands in a 1:2 ratio. 相似文献
2.
A 3-D supramolecular framework, [Er(pybz)2(Hnds)(H2O)2]·H2O (1, Hpybz = 4- pyridin-4-yl-benzoic acid, H2nds = naphthalene-1,5-disulfonic acid), based on lanthanide ions and mixed ligands has been hydrothermally synthesized. The structure was determined by single-crystal X-ray diffraction and further characterized by IR, elemental analysis and thermogravimetric analysis. Compound 1 crystallizes in the monoclinic system, space group P21/n with a = 9.849(2), b = 22.526(5), c = 17.167(4) A, β =105.461(4)° and V = 3670.9(2) A^3. In 1, two seven-coordinated Er^3+ ions are bridged by two pybz^- ligands to form a dimeric [Er2(COO)2] unit, which is further orderly linked by carboxyl of pybz^-ligand to obtain a 1-D chain running along the a axis. Interestingly, significant H-bonding and π-π stacking interactions link the neighboring parallel chains leading to a 3-D supramolecular network structure which displays 1-D rhombus open channels (17.2A× 22.5A). 相似文献
3.
IntroductionSalicylicacid (H2 sal)isaninterestingversatilelig andanditscomplexesareofcontinuousinterestfrombothstructuralandbiologicalviewpoints .1 2 H2 salhastwofunctionalgroups ,thecarboxylateandphenoxide ,whichhavebeenwidelyempolyedinthesynthesisofmononucl… 相似文献
4.
A chiral supramolecular compound (H3O){[cis-Rh2((C6H5)2P(C6H4))2(SO4)- (DMF)]2(μ- OC2H5)}·6C2H5OH (1) has been synthesized and characterized by X-ray single-crystal analysis. Compound 1 crystallizes in monoclinic, space group C2/c with a = 26.752(3), b = 13.5868(16), c = 26.611(3) , β = 103.891(2)°, V = 9389.5(19) 3, Z = 4, C92H114N2O18P4Rh4, Mr = 2135.49, Dc = 1.511 g/cm3, F(000) = 4384 and μ(MoKα) = 0.870 mm-1. The final R = 0.0441 and wR = 0.1186 for 8283 observed reflections with I > 2σ(I) and R = 0.0567 and wR = 0.1290 for all data. The structure of the compound is unique. It contains two inherent chiral {cis-Rh2[(C6H5)2P(C6H4)]2}2+ units which are connected not only in the equatorial positions by two sulfato ligands, but also in two of their axial positions by a μ2 ethoxide anion. The remaining axial positions of Rh24+ units in 1 are occupied by the DMF molecules. The sulfato ligands act as μ4 tridentate bridges to connect the Rh24+ units. The Rh-Rh metal-metal bond distances are comparable to those in analogous dirhodium compounds. 相似文献
5.
A novel complex,[Cu2(phen)(sal)(Hsal)2]n(1),was synthesized and structurally characterized.The basic dimeric units are hold by sal ligands and extended into 1-D network.The carboxylate grougs of salicylates coordinate to the central ion in three different coordination modes:chelating,bridging and bridging-chelating.In the case of bridging-chelating of the carboxylate group of the salicylate,all three oxygen atoms of salicylate are bidentately coordinated to copper ion,namely,μ4-η^3 binding mode. 相似文献
6.
Three new lanthanide-organic compounds, namely, [Ln_2(OH)_2(oba)(2-pc)_2]n(Ln =Er(1), Ho(2), and Dy(3))(oba = 4,4?-oxybis(benzoate), 2-pc = 2-pyrazinecarboxylic acid) have been obtained under hydrothermal conditions. These compounds are isostructural and exhibit 2 D layered structures by incorporating [Ln_4(μ_3-OH)_4]~(8+) clusters and the mixed linkers of oba and 2-pc. It is interesting that decarboxylation occurred in the ortho position and 2,3-pyrazinedicarboxylic acid was partially transformed into 2-pc under hydrothermal conditions. Compound 3 emits a typical Dy~(3+) emission spectrum. Furthermore, the PXRD, TGA and IR spectra were also studied. 相似文献
7.
配位聚合物由于具有丰富的拓扑结构,并在客体交换与分离、气体存储、手性拆分、选择性催化、分子识别、荧光和磁性等方面有潜在应用,已成为当前配位化学、材料化学和晶体工程学的热点研究领域之一。本文结合近年来本课题组的研究工作及国内外相关研究进展,概述了含三唑-有机羧酸混合配体的配位聚合物结构和性质,着重讨论了有机羧酸配体在构筑配合物结构中的作用,并对今后的研究和发展方向进行了展望。 相似文献
9.
(Under solvothermal conditions with the mixed solvents of C 2H 5OH and H 2O,a new heterometallic lanthanide-titanium-organic compound,[TbTi(μ3-O)(L 3)(H 2O) 4]·H 3O(1,H 2L=diphenylglycolic acid),has been synthesized.Compound 1 exhibits a 3D supramolecular framework by incorporating the tetra-nuclear[Tb 2Ti 2(μ3-O)2]unit and L 2-ligand.Compound 1 shows intense green luminescence.Furthermore,the PXRD,TGA and IR spectra were also studied.) 相似文献
10.
The ability of lanthanide(III) ions to form stable complexeswith three different macrocyclic ligands, L 1 , L 2 and L 3 , has been investigated.The Schiff base macrocycle L 1 and its corresponding reduced ligand L 2 arederived from 2,6-bis(2-formylphenoxymethyl)pyridine and diethylentriamine;the reduced ligand L 3 is derived from 2,6-diformylpyridine and N,N-bis(3-aminopropyl)methylamine. Lanthanide nitrate complexes of L 1 and L 2 have beenprepared by direct reaction between each ligand and the appropriate hydrated lanthanidenitrate; attempts to obtain the corresponding perchlorate complexes have been unsuccessful.All nitrate complexes of L 1 give the expected [1:1, Ln:L 1 ] stoichiometry; however, complexes obtained with L 2 show a [2:1, Ln:L 2 ] stoichiometry. Finally, complexation reactions with L 3 have been carried out in order to investigatethe coordination capability of this small and flexible ligand towards the Ln(III) ions. 相似文献
11.
Complex [Cu(2,2′‐bipy)(H 2L 1)] (ClO 4) 2(1) has been synthesized by the self‐assembly of Cu(ClO 4) 2 with a rigid ligand 2,2′‐bipyridine and a flexible potential tetradentate ligand N, N'‐bis(hydroxyethyl)ethylenediamine (H 2L 1). Crystal analyses reveal that the potentially tetradentate ligand H 2L 1 acts in a tridentate mode by the coordination of one hydroxyl oxygen atom and two amino nitrogen atoms. The Cu(II) atom coordinates additionally with two bipyridyl nitrogen atoms, giving a distorted square pyramidal geometry. Each complex molecule is connected with four surrounding molecules along the ac plane by multiple hydrogen bonds, leading to 2D sheets constituted with 0.7874 nm × 1.0891 nm metallomacrocyclic rectangles. Each vertex of the rectangle is occupied by a copper atom, and the four sides are comprised of multiple hydrogen bonds. 相似文献
12.
Hydrothermally reaction of Cd(NO3)2·4H2O, pimelic acid (H2Pim) mixed with two N-containing ligands of 1,2-bis(2-methyl-imidazol-1-ylmethyl)benzene (1,2-mbix) or 1,3-bis(2-methyl-imidazol-1-ylmethyl)benzene (1,3-mbix) gave rise to two new Cd(II) MOFs, [Cd(Pim)(1,2-mbix)] (1) and [Cd(Pim)(1,3-mbix)]·H2O (2). Both MOFs were structurally characterized by IR and UV–Vis spectra, single-crystal and powder X-ray diffraction, thermogravimetric analyses. MOF 1 shows a fourfold interpenetrating dia network. Differently, MOF 2 shows a 2D?→?3D interdigitated architecture base on the 63 hcb layer when 1,2-mbix was replaced by 1,3-mbix. The luminescent properties of 1 and 2 have been investigated. Furthermore, the luminescent quenching experiments suggest both MOFs exhibit good selectivity and sensitivity to detect Fe3+ and Cr2O72? in water. 相似文献
13.
The reactivity of KNHAr reagents (Ar = C(6)H(5), C(6)H(3)Me(2)-2,6, C(6)H(3)(i)Pr(2)-2,6) with lanthanide and yttrium trichlorides has been investigated. With the larger metals Nd and Sm and the smaller 2,6-dimethyl-substituted ligand, the bimetallic dianionic complexes [K(THF)(6)](2)[Ln(&mgr;-NHC(6)H(3)Me(2)-2,6)(NHC(6)H(3)Me(2)-2,6)(3)](2) (Ln: Sm, 1a; Nd, 1b) are isolated as the potassium salts. Under the same reaction conditions YCl(3) forms a bimetallic anion which retains chloride: [K(DME)(2)(THF)(3)][Y(2)(&mgr;-NHC(6)H(3)Me(2)-2,6)(2)(&mgr;-Cl)(NHC(6)H(3)Me(2)-2,6)(4)(THF)(2)], 2. With the larger 2,6-diisopropyl ligands, neutral complexes are isolated in both solvated monometallic and unsolvated bimetallic forms. With Nd, a distorted octahedral trisolvate, Nd(NHC(6)H(3)(i)Pr(2)-2,6)(3)(THF)(3), 3, was obtained, whereas with Yb and Y the trigonal bipyramidal disolvates, Ln(NHC(6)H(3)(i)Pr(2)-2,6)(3)(THF)(2) (Ln: Yb, 4a; Y, 4b), were isolated. THF-free complexes of the NHC(6)H(3)(i)Pr(2)-2,6 ligand are available by reacting the amine NH(2)C(6)H(3)(i)Pr(2)-2,6 with Ln[N(SiMe(3))(2)](3) complexes. By this route, the dimers [Ln(&mgr;-NHC(6)H(3)(i)Pr(2)-2,6)(NHC(6)H(3)(i)Pr(2)-2,6)(2)](2) (Ln: Yb, 5a; Y, 5b) were isolated. The reaction of the unsubstituted arylamido salt KNHC(6)H(5) with NdCl(3) produced an insoluble material which was characterized as [Nd(NHC(6)H(5))(3)(KCl)(3)], 6. 6 reacted with Al(2)Me(6) in hexanes and produced a heteroleptic mixed-metal complex {[Me(2)Al(&mgr;-Me(2))](2)Nd(&mgr;(3)-NC(6)H(5))(&mgr;-Me)AlMe}(2), 7, and the trimeric aluminum arylamido complex [Me(2)Al(&mgr;-NHC(6)H(5))](3), 8. The solvent of crystallization and relevant crystallographic data for the compounds identified by X-ray analysis follow: 1a,THF, 156 K, P2(1)/n, a = 12.985(2) ?, b = 27.122(5) ?, c = 17.935(3) ?, beta = 100.19(1) degrees, V = 6216(1) ?(3), Z = 2, 6148 reflections (I > 3sigma(I)), R(F)() = 7.1%; 1b,THF, 156 K, P2(1)/n, a = 12.998(2) ?, b = 27.058(3) ?, c = 17.962(2) ?, beta = 99.74(1) degrees, V = 6225(1) ?(3), Z = 2; 2,DME/hexanes, P2(1)/n, a = 23.335(2) ?, b = 12.649(1) ?, c = 27.175(3) ?, beta = 96.36(1) degrees, V = 7971(1) ?(3), Z = 4, 2788 reflections (I > 3sigma(I)), R(F)() = 9.5%; 3, THF, P2(1), a = 12.898(1) ?, b = 16.945(1) ?, c = 13.290(1) ?, beta = 118.64(2) degrees, V = 2549.3(3) ?(3), Z = 2, 3414 reflections (I > 3sigma(I)), R(F)() = 4.3%; 4a, hexanes, P2(1), a = 9.718(2) ?, b = 19.119(3) ?, c = 12.640(2) ?, beta = 112.08(1) degrees, V = 2176.3(6) ?(3), Z = 2, 2933 reflections (I > 3sigma(I)), R(F)() = 4.3%; 4b, hexanes, 158 K, a = 9.729(2) ?, b = 19.095(5) ?, c = 12.744(1) ?, beta = 112.11(1) degrees, V = 2193.4(6) ?(3); 5b, hot toluene, 158 K, P2(1), a =19.218(9) ?, b = 9.375(3) ?, c = 19.820(5) ?, beta = 110.25(2) degrees, V = 3350(2)?(3), Z = 2, 1718 reflections (I > 2sigma (I)), R1 = 9.7%; 7, hexanes, 156 K, P&onemacr;, a = 9.618(3) ?, b = 12.738(4) ?, c = 9.608(3) ?, alpha = 99.32(1) degrees, beta = 108.87(1) degrees, gamma = 94.23(1) degrees, V = 1089.1(6) ?(3), Z = 2, 2976 reflections (I > 3sigma(I)), R(F)() = 3.9%; 8, hexanes, 156 K, Pcab, a = 23.510(5) ?, b = 25.462(5) ?, c = 8.668(2) ?, V = 5188(1) ?(3), Z = 8, 1386 reflections (I > 3sigma(I)), R(F)() = 5.7%. 相似文献
14.
Two new coordination polymers,[Ln(oba)(ox)0.5(H2O)2]n(Ln = Ho(1),Eu(2);H2oba = 4,4?-oxybis(benzoic acid),H2ox = oxalic acid) have been synthesized under hydrothermal conditions.According to single-crystal X-ray diffraction analyses,complex 1 crystallizes in the monoclinic system,space group P21/c with a = 13.783(2),b =10.0120(15),c = 12.1974(18) ,β = 105.217(2)°,V = 1624.2(4) 3,C15H12O9Ho,Mr = 501.18,Z = 4,Dc = 2.050 g/cm3,F(000) = 964,μ = 4.919 mm-1,λ(MoKα) = 0.71073 ?,GOOF = 1.124,the final R = 0.0239 and wR = 0.0570 for 3310 independent reflections with Rint = 0.0298.Complexes 2 and 1 are isostructural.Oba and ox ligands bridge the Ln(III) ions into 2D layers with(4,4) topology,which are further interlinked into a 3D supramolecular network by hydrogen bonds.TG curves of the two complexes are studied to examine their thermal stabilities.Additionally,complex 2 shows red fluorescence in the solid state at room temperature. 相似文献
15.
A new two-dimensional Mnn metal-organic framework (MOF), [Mn4(μ3-OH)2L2 (4,4'-bipy)2(H20)2]·H2O (1, H3L = 5-oxyacetateisophthalic acid, 4,4'-bipy = 4,4'-bipyridine) has been synthesized by the hydrothe... 相似文献
17.
Three new Copper(II) polymers coordinated by both rigid and flexible ligands, [Cu(bpy)(C 5H 6O 4)] n ( 1 ), [Cu(bpy)(C 6H 8O 4)] n ( 2 ), and [Cu 2(bpy) 2(C 6H 8O 4) 2] n ( 3 ) (bpy = 4,4′‐bipyridine), have been hydrothermally synthesized and structurally characterized. Complex 1 features a box‐like bilayer motif of (4, 4) net. It crystallizes in triclinic space group with cell parameters: a = 8.1395(6) Å, b = 9.43 12(8) Å, c = 10.5473(8) Å, α = 112.1830(1)°, β = 92.423(2)°, γ = 104.752(2)°, V = 716.31(1) Å 3, Z = 2. Complex 2 crystallizes in triclinic space group with a = 8.8652(4) Å, b = 8.9429(4) Å, c = 10.6390(4) Å, α = 89.520(2)°, β = 69.123(2)°, γ = 75.2440(1)°, V = 758.92(6) Å 3, Z = 2. Complex 3 crystallizes in monoclinic space group Cc with a = 11.1521(1) Å, b = 15.3961(1) Å, c = 17.7419(1) Å, β = 105.715(3)°, V = 2932.4(5) Å 3, Z = 4. Complexes 2 and 3 are isomeric with different coordination modes of adipato ligand. Both of them possess the two‐fold interpenetrated 3‐D pcu topological net. 相似文献
18.
以3,5-二(吡啶-4-甲氧基)苯甲酸(HL)与芳香二羧酸为配体,在水热条件下与Zn(Ⅱ)或Cd(Ⅱ)盐反应得到4个具有3,4-连接多重穿插结构的配位聚合物:[Zn 2L 2(tdc)] n ( 1),{[Zn 4L 4(Hhdc) 2]·H 2O} n ( 2),{[Zn 2L 2(Hhdc)]·H 2O} n ( 3),{[Cd 2L 2(bdtc)(H 2O)]·0.5H 2O} n ( 4)(H 2tdc=2,5-噻吩二甲酸,H 3hdc=5-羟基间苯二甲酸,H 2bdtc=1,4-苯二硫乙酸).晶体结构分析表明,聚合物 1~ 3具有3,4-连接四重穿插的三维网络结构,拓扑符号分别为(4.8 2)(4.8 5) ( 1)、(6 3)(6 5.8) ( 2)和(6 3)(6 5.8) ( 3). 4为3,4-连接三重穿插的二维平面结构,拓扑符号为(63)(66).测定了配位聚合物 1、3和 4的热稳定性和荧光性质. 相似文献
19.
以3,5-二(吡啶-4-甲氧基)苯甲酸(HL)与芳香二羧酸为配体,在水热条件下与Zn(Ⅱ)或Cd(Ⅱ)盐反应得到4个具有3,4-连接多重穿插结构的配位聚合物:[Zn 2L 2(tdc)] n ( 1),{[Zn 4L 4(Hhdc) 2]·H 2O} n ( 2),{[Zn 2L 2(Hhdc)]·H 2O} n ( 3),{[Cd 2L 2(bdtc)(H 2O)]·0.5H 2O} n ( 4)(H 2tdc=2,5-噻吩二甲酸,H 3hdc=5-羟基间苯二甲酸,H 2bdtc=1,4-苯二硫乙酸).晶体结构分析表明,聚合物 1~3具有3,4-连接四重穿插的三维网络结构,拓扑符号分别为(4.8 2)(4.8 5) ( 1)、(6 3)(6 5.8) ( 2)和(6 3)(6 5.8) (3). 4为3,4-连接三重穿插的二维平面结构,拓扑符号为(6 3)(6 6).测定了配位聚合物 1、3和 4的热稳定性和荧光性质. 相似文献
20.
1 INTRODUCTIONInstead of the traditional organo-phosphate or phosphorus extractents which ultimately create undesirable waste even after incineration [1], some organic amides[2] have been suggested as possible extractents for the separation of lanthanides, such as (R1R2NCO)2(CH2)n [3,4]. As excellent ligands, diamides show stability, low toxicity and can be synthesized by simple methods. Hudson and his colleagues have synthesized a series of malondiamides and studied the structures of t… 相似文献
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