Structural study of the coordination behavior of a tetradentate NO3-donor amino alcohol ligand toward a Cd-II:Hg-II mixture

摘要

In this work, the reaction of 2,2', 2 ''-nitrilotriethanol (NTE) with a 1:1 mixture of CdI2 and HgI2 is investigated. The complex [Cd( NTE)(2)][Hg-2(mu-I)(2)I-4] was synthesized and identified by elemental analysis, FT-IR, H-1 NMR spectroscopy and single-crystal X-ray diffraction. The structure of the [HNTE]Cl salt is also presented. In the crystal structure of the complex, the cadmium atom has a CdN2O6 environment in a slightly distorted cube geometry. This geometry is one of the rare cube geometries with a minimum distortion among the Cambridge Structural Database structures for cadmium complexes. The anionic moiety has a binuclear structure with the mercury atoms being in tetrahedral environments. In the network of the complex, in addition to O-H center dot center dot center dot I hydrogen bonds, there are I center dot center dot center dot I interactions which lead to ten-membered rings.