Abstract
The title compound, [Cd2(C7H10NS2)4], is a neutral dinuclear cadmium(II) complex bearing four bis N,N-di-allyl-di-thio-carbamate ligands coordinating to two CdII cations. In each of the monomeric subunits, there are four S atoms of two di-thio-carbamate ligands [Cd-S = 2.5558 (3), 2.8016 (3), 2.6050 (3) and 2.5709 (3) Å] that coordinate to one CdII atom in a bidentate mode. The dimers are located over an inversion centre bridged by two additional bridging Cd-S bonds [2.6021 (3) Å], leading to a substantial distortion of the geometry of the monomeric subunit from the expected square-planar geometry. The five-coordinate environment around each of the CdII ions in the dimer is best described as substanti-ally tetra-gonally distorted square pyramidal. The di-thio-carbamate groups are themselves planar and are also coplanar with the CdII ions. The negative charge on these groups is delocalized by resonance across the S atoms bound to the CdII cation. This delocalization of the π electrons in the di-thio-carbamate groups also extends to the C-N bonds as they reveal significant double bond character [C-N = 1.3213 (16) and 1.3333 (15) Å].
Highlights
Science Innovation and Modelling (MaSIM) Research Focus Area, Faculty of Agriculture, Science and Technology, NorthWest University (Mafikeng Campus), Private Bag X2046, Mmabatho, South Africa, cC.D
Complex bearing four bis N,N-diallyldithiocarbamate ligands coordinating to two CdII cations
This delocalization of the electrons in the dithiocarbamate groups extends to the C—N bonds as they reveal significant double bond character [C—N = 1.3213 (16) and 1.3333 (15) Å]
Summary
Interest in the study of metal dithiocarbamates was aroused because of their interesting structural features and diverse applications (Thammakan & Somsook, 2006). The structural chemistry of cadmium dithiocarbamates of the general formula Cd(S2CNRR0 ) where R, R0 = alkyl or aryl is dominated by its existence in binuclear form. This common feature has been ascribed to the effect of aggregated species, which they adopt in the solid state, resulting from equal numbers of 2-tridentate and bidentate (chelating) ligands (Tiekink, 2003; Tan, Halim et al, 2016). Another important practical application of cadmium dithiocarbamates is their ability to efficiently collect gold from acidic solutions (Rodina et al, 2014).
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