Complexes of the [K(18-Crown-6)]+ fragment with bis(tetrazolyl)borate ligands: unexpected boron-nitrogen bond isomerism and associated enforcement of kappa3-N,N',H-ligand chelation.
The syntheses and solid-state structures of K(BH(2)(RCN(4))(2))(18-crown-6) (R = H, Me, NMe(2), and NiPr(2)) are described. Complexes where R = H and Me have B-N bonds to N(1) of the tetrazolyl groups and form one-dimensional polymers, whereas those with R = NMe(2) and NiPr(2) possess isomeric B-N bonds to N(2) of the tetrazolyl moieties and adopt chelating kappa(3)-N,N',H-coordination modes to the potassium ion.
Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, USA.
Dongmei
D
Lu
Charles H
CH
Winter