Copper(II) Complexes of 2-Butyl-, 2-Isobutyl-, 2-Sec-Butyl, and 2-Tert-Butylaminopyridine N-Oxides

摘要

Copper(II) complexes of 2-butyl-, 2-isobutyl-, 2-sec-butyl- and 2-tert-butylaminopyridine N-oxide (BH, IBH, SBH and TBH, respectively) have been prepared from the following salts: tetrafluoroborate, nitrate, chloride, bromide and acetate. Solids of the general formula Cu(LH)4(X2) (where LH#x2ED;all four ligands when X#x2ED;BF4#x2212;and LH#x2ED;BH and SBH when X#x2ED;NO3#x2212;) and Cu(LH)2X2 (where LH#x2ED;IBH and TBH when X#x2ED;NO3#x2212;). The complexes prepared with the two halide salts are polymeric and have empirical formulas of either Cu(LH)2X2or Cu(LH)X2or a combination of the two. With copper(II) acetate complexes of stoichiometry CuL2 (where is L#x2ED;conjugate base of BH, IBH and SBH) were isolated and all of the complexes were characterized using spectral methods (i.e., IR, UV-Vis and ESR). All four ligands coordinate solely via the N-oxide oxygen except for their conjugate bases which also coordinate via the amine nitrogen to act as bidentate ligands. Substantial stereochemical and stoichiometric variation occurs in these solids compared to their analogs with smaller alkyl substituents on the amino nitrogen.