Synthesis and Structure of a Ni(II)-Cu(II)-Ni(II) Trinuclear Complex With a New
Macrocyclic Complex Ligand
Xiao-Zeng Li,a* Jun-Hong
He,a and Dai-Zheng Liaob
a Department of Chemistry, Tianjin University, Tianjin 300072, P. R.
China. E-mail: email@example.com
b Department of Chemistry, Nankai University, Tianjin 300071, P. R.
A trinuclear complex, [Cu(NiL)2(NCS)2], was prepared by
the reaction of a new macrocyclic oxamido complex ligand NiL, Cu(ClO)2∙6H2O
and KNCS. L denotes the doubly deprotonated form of dimethyl 5,6,7,8,15,16-hexahydro-15-methyl-6,7-dioxodibenzo[1,4,8,11]tetraazacyclotetradecine-13,18-dicarboxylate.
Excess Cu(ClO)2∙6H2O is necessary for the formation of the
title compound. The structure of the title complex was further characterized by
X-ray single-crystal analysis. Cu(II) and each Ni(II) is bridged by the oxamido
group from the corresponding macrocyclic ligand. The coordination geometry
around each Ni( = 2 \* ROMAN II) ion is slightly distorted square planar with N4
donor set, and the Cu(II) ion has a distorted octahedral
coordination geometry of O4N2 donor set. π∙∙∙π
interactions and C–H∙∙∙O hydrogen bonds link the molecules to form two-dimensional
Key words: synthesis,
crystal structure, macrocyclic compound, complex ligand, Ni( = 2 \* ROMAN
II)-Cu( = 2 \* ROMAN II)-Ni( = 2 \* ROMAN II) complex