Abstract
The crystal and molecular structure of chlorotris(monomethylthiourea)silver(I) has been solved and refined by full-matrix least-squares methods to a finalR of 0·039 from 1150 reflections measured by counter techniques at ambient room temperature. The crystals are orthorhombic:Pmcn, a = 14·824(2),b = 8·524(1),c = 12·671(1) A,Z = 4,D m = 1·68,D c = 1·72 gcm−3. The structure consists of independent, distorted tetrahedral Ag(I) moieties with only weak hydrogen bonds and/or van der Waals interactions between molecules. These molecules are packed in such a way that Ag, Cl and one entire monomethylthiourea ligand all lie in a crystallographic mirror plane, and the other two ligands are related by this mirror. This arrangement, plus the alternation of the Ag-Cl bond direction, leads to a non-polar sheet of Ag, Cl and monomethylthiourea groups with other monomethylthiourea groups protruding from either side of the sheet. Only N-H⋯Cl hydrogen bonds and van der Waals interactions exist between sheets. The Ag-S distance is somewhat long at 2·649(3) A, as is one of the Ag-S distances at 2·665(3) A. The other two Ag-S distances are 2·520(2) A. The geometry of the complex makes it clear that the Ag-S bond is formed by donation of an electron pair from a sulfur sp2 orbital.
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