Synthesis, structures and photoluminescence of thiocyanate bridged metal-organic polymers containing functional imidazole ligand
摘要:
Three new coordination polymers, [Cd(SCN)(2)L2L](n) (1), [CdHg(SCN)(4)L2L](n) (2) and [MnHg(SCN)(4)L-2](n) (3) have been prepared by the self-assembly of L with the corresponding metal salts and NaSCN (L is a new functional rigid imidazole ligand, trans-4-imidazolyl-4'-(N,N-diethylamino)stilbene). The crystal structures of the coordination polymers have been determined by single crystal X-ray diffraction analysis. [Cd(SCN)(2)L-2](n) (1) crystallizes in the triclinic crystal system with space group P1. Adjacent Cd-II ions are bridged by SCN- ligands to form infinite chains with the remaining two positions of six-coordinated Cd-II ion being occupied by two imidazole ligands. [CdHg(SCN)(4)L-2](n) (2) crystallizes in the triclinic crystal system with space group P1. Cd-II and Hg-II centers are bridged by SCN- ligands to form two-dimensional framework sheets. Cdn(II) and Hg-II ions are coordinated by six nitrogen atoms and four thiocyanate sulfur atoms, respectively. [MnHg(SCN)(4)L2L](n) (3) crystallizes in the monoclinic crystal system with space group P2(1)/c. Each Mn-II ion is in a N-6 distorted octahedral geometry, and each Hg-II ion is in a S-4 distorted tetrahedral geometry, which exhibit similar coordination mode to that of 2. Mn-II and Hg-II ions are linked by bridging NCS- groups to form two-dimensional sheets. The electronic spectra and solid-state luminescence properties of complexes 1, 2 and 3 have been studied at room temperature. (C) 2006 Elsevier Ltd. All rights reserved.
Abstract A novel imidazole derivative, 1-[trans-4-(4-diethylaminostyryl)phenyl]imidazole (abbreviated as L), and its complex Zn(SCN)2L2 have been synthesized and fully characterized. Their crystal structures have been determined by X-ray diffraction. The molecular structure of L is approximately coplanar, the bond lengths of C–C and C–N are located between the normal double and single bonds, which
摘要 合成并充分表征了一种新型咪唑衍生物1-[反式-4-(4-二乙氨基苯乙烯基)苯基]咪唑(简称L)及其配合物Zn(SCN)2L2。它们的晶体结构已通过 X 射线衍射确定。L 的分子结构近似共面,C-C 和 C-N 的键长位于正常的双键和单键之间,这表明 L 在分子中具有离域的 π 电子系统。在Zn(SCN)2L2的分子结构中,锌原子由配体(L)的两个氮原子和硫氰酸盐的两个氮原子配位四个,形成扭曲的四面体几何结构。Zn(SCN)2L2 的一维结构是由 C-H⋯S 相互作用和 π-π 相互作用形成的。它们都在非中心对称空间群 P21 中结晶,
Synthesis, structures and photoluminescence of thiocyanate bridged metal-organic polymers containing functional imidazole ligand
Three new coordination polymers, [Cd(SCN)(2)L2L](n) (1), [CdHg(SCN)(4)L2L](n) (2) and [MnHg(SCN)(4)L-2](n) (3) have been prepared by the self-assembly of L with the corresponding metal salts and NaSCN (L is a new functional rigid imidazole ligand, trans-4-imidazolyl-4'-(N,N-diethylamino)stilbene). The crystal structures of the coordination polymers have been determined by single crystal X-ray diffraction analysis. [Cd(SCN)(2)L-2](n) (1) crystallizes in the triclinic crystal system with space group P1. Adjacent Cd-II ions are bridged by SCN- ligands to form infinite chains with the remaining two positions of six-coordinated Cd-II ion being occupied by two imidazole ligands. [CdHg(SCN)(4)L-2](n) (2) crystallizes in the triclinic crystal system with space group P1. Cd-II and Hg-II centers are bridged by SCN- ligands to form two-dimensional framework sheets. Cdn(II) and Hg-II ions are coordinated by six nitrogen atoms and four thiocyanate sulfur atoms, respectively. [MnHg(SCN)(4)L2L](n) (3) crystallizes in the monoclinic crystal system with space group P2(1)/c. Each Mn-II ion is in a N-6 distorted octahedral geometry, and each Hg-II ion is in a S-4 distorted tetrahedral geometry, which exhibit similar coordination mode to that of 2. Mn-II and Hg-II ions are linked by bridging NCS- groups to form two-dimensional sheets. The electronic spectra and solid-state luminescence properties of complexes 1, 2 and 3 have been studied at room temperature. (C) 2006 Elsevier Ltd. All rights reserved.