Copper(I) Tetrafluoroborate Complexes with bis(2-pyridyl)-t-Butylphosphine

The reaction of bis(2-pyridyl)-t-butylphosphine (L) with [Cu(MeCN)4]BF4 in MeCN or CH2Cl2 results in the formation of dinuclear complexes [Cu2L2](BF4)2 (1) and [Cu2L2(MeCN)2](BF4)2 (2), respectively. In the both complexes, the ligands L act as P,N,N’-bridging ones, holding two Cu atoms in a head-to-tail manner. In the [Cu2L2]2+ cations of 1, the Cu⋯Cu contact of 2.756 Å is observed, while the similar distances in two independent cations of 2 are 3.145-3.257 Å.