Synthesis of a missing structural link: the first trigonal planar B4 units in the novel complex boride Ti1+xOs2−xRuB2 (x = 0.6)

Abstract

The newly synthesized boride Ti_1+xOs_2−xRuB₂ (x = 0.6) has a novel structure featuring one-dimensional chains of titanium atoms, one-dimensional strings of face-sharing empty tetrahedral and square pyramidal clusters and, most importantly, trigonal planar and strongly bonded B₄ units with a B–B distance of 1.89 Å.