Abstract
Tin(II) dibromide, 2b, and cyclopentadienyltin(II) chloride, 2c, and cyclopentadienyltin(II) bromide, 2d, were reacted with cyclic (alkyl)(amino)carbene (cAAC), 1, to give the corresponding complexes cAAC·SnBr2, 3b, cAAC·SnCpCl, 3c, and cAAC·SnCpBr, 3d, which were studied in solution and in the solid state. Although isolatable as crystalline solids, 3c,d exist in a heteroleptic/homoleptic equilibrium with other tin(II) species, in solution. In addition, the coordination chemistry of 3b was investigated and the corresponding iron tetracarbonyl complex, 5, could be isolated and structurally characterized. Furthermore, the mechanism of the equilibrium reaction observed for 3c,d in solution, as well as the chemical bonding nature of all cAAC complexes were investigated by quantum-chemical calculations within the DFT framework.
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