Molecular structure and linkage isomerization in copper(II) complexes containing N,N-dialkyl-N′-benzylethylenediamine and thiocyanate ligands: a combined crystallographic, spectroscopic and DFT study
作者:Hamid Golchoubian、Sara Koohzad
DOI:10.1007/s11243-014-9805-1
日期:2014.4
the copper(II) center, DFT calculations are carried out on the complexes. Two different cases were considered, namely when nitrogen is the donor atom and when sulfur is the donor atom. In all cases, the N-coordinated isomers were always more stable than the S-coordinated ones. The electronic spectra of the complexes were analyzed and assigned by means of DFT/TD-DFT, together with molecular orbital analysis
三种硫氰酸盐-Cu(II) 配合物的联合实验和计算研究,通式为 [Cu(Ln)2(NCS)]ClO4, (L1 = N,N-二甲基,N'-苄基-乙二胺, L2 = N, N-二乙基,N'-苄基-乙二胺,L3=N,N-二异丙基,N'-苄基-乙二胺)。通过物理化学和光谱方法合成和结构表征化合物。[Cu(L1)2(NCS)]ClO4 的 X 射线晶体学表明,铜原子通过四个胺 N 原子和末端 SCN− 离子的 N 原子的配位实现了扭曲的四角锥环境。为了研究空间拥挤对铜 (II) 中心硫氰酸盐配位模式的影响,对配合物进行了 DFT 计算。考虑了两种不同的情况,即当氮是供体原子并且硫是供体原子时。在所有情况下,N 配位异构体总是比 S 配位异构体更稳定。通过DFT/TD-DFT以及分子轨道分析对配合物的电子光谱进行了分析和分配。