Abstract

A new Cd(II) polymer [Cd(btc)(4,4′-bipyridine)]_n 1 (H₄btc = 3,3′,4,5′-biphenyl tetracarboxylic acid) was synthesized under hydrothermal conditions. The compound crystallizes with b = 20.223(3), c = 13.478(2) Å, a = 11.9134(18), β = 110.486(2)°, α = 90°, γ = 90°, V = 3041.8(8) ų, Z = 4, in the monoclinic system, space group P2(1)/c, μ = 1.468 mm⁻¹, M_r = 690.33, F(000) = 1600, D_c = 1.771 mg/m³, the final R = 0.0546 and wR = 0.1480 for 5647 observed reflections with I > 2σ(I). The compound presents a three-dimensional (3D) network extended by both 4,4′-bipyridine ligands and btc^4- anions in which the btc^4- anions employ a chelating coordination mode. The structure could be described as a (3,4,5)-connected 3D network with (4².6³.7⁴.8)(4².6³.7)(6.7²) topology net from the topology point of view. Elemental analyses, infrared spectroscopy, thermogravimetric analysis, and powder X-ray diffraction properties of 1 are also investigated.

摘要

新的CD（II）聚合物[CD（BTC）（4,4'-联吡啶）] _ñ 1（H ₄ BTC = 3,3 ' ，4,5 ' -联苯四羧酸）中的溶液在水热条件下合成。化合物结晶b  = 20.223(3), c  = 13.478(2) Å, a  = 11.9134(18), β  = 110.486(2)°, α  = 90°, γ  = 90°, V  = 3041.8(8) Å ³ , Z  = 4, 在单斜晶系中, 空间群P2(1)/c , μ  = 1.468 mm ^-1 , M _r = 690.33, F(000) = 1600，D _c = 1.771 mg/m ³，最终的R  = 0.0546 和wR  = 0.1480，对于 5647 次观测到的反射，I  > 2 σ ( I )。化合物呈现的三维（3D）网络双方4,4延伸'联吡啶配体和BTC ^4-阴离子，其中BTC ^4-阴离子采用螯合配位模式。该结构可以描述为具有 (4 ² .6 ³ .7 ⁴ .8)(4 ² .6 ³ .7)(6.7 ² )的 (3,4,5) 连接的 3D 网络) 从拓扑的角度看拓扑网。还研究了1 的元素分析、红外光谱、热重分析和粉末 X 射线衍射特性。