Abstract
In the title compound, [HgCl2(C16H28N2Se)], the primary geometry around the Se and Hg atoms is distorted trigonal-pyramidal and distorted square-pyramidal, respectively. The distortion of the mol-ecular geometry in the complex is caused by the steric demands of the ligands attached to the Se atom. The Hg atom is coordinated through two chloride anions, an N atom and an Se atom, making up an unusual HgNSeCl2 coordination sphere with an additional long Hg⋯N inter-action. Inter-molecular C-H⋯Cl inter-actions are the only identified inter-molecular hydrogen-bonding inter-actions that seem to be responsible for the self assembly. These relatively weak C-H⋯Cl hydrogen bonds possess the required linearity and donor-acceptor distances. They act as mol-ecular associative forces that result in a supra-molecular assembly along the b-axis direction in the solid state of the title compound.
Highlights
The chemistry of mercuric compounds with multidentate amine ligands is of interest because of the low coordination number and geometry preferences of the HgII atom, which facilitates extraordinarily rapid exchange of simple ligands (Bebout et al, 2013; Carra et al, 2013)
As part of our continuing studies in this area, we have been investigating the structural chemistry of mercuric compounds with multidentate amine ligands combined with either Se (Manjare et al, 2014) or Te (Singh et al, 2003) as an additional ligand in the presence of an HgX2 group (X = Cl, Br, or I) and the structure of the title compound is reported
The distortion of the molecular geometry in the complex is caused by the steric demands of the ligands attached to the selenium atom
Summary
The chemistry of mercuric compounds with multidentate amine ligands is of interest because of the low coordination number and geometry preferences of the HgII atom, which facilitates extraordinarily rapid exchange of simple ligands (Bebout et al, 2013; Carra et al, 2013). The enhanced binding thermodynamics of these multidentate ligands has been used to suppress intermolecular ligand-exchange rates for a variety of HgII complexes in solution, greatly enhancing the meaningfulness of NMR characterization. Under conditions of slow intermolecular exchange, the rates of intramolecular isomerization processes for HgII can still exceed both the chemical shift and coupling constant time scale, when bond cleavage is unnecessary and the structures of these complexes have been determined (Bebout et al, 2013; Carra et al, 2013).
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