Crystal structure of tris(μ-bis{4-[(pyridin-2-ylmethylidene)amino]phenyl}methane-κ4N,N′:N′′,N′′′)dizinc tetrakis(tetrafluoridoborate) acetonitrile trisolvate

Abstract

The asymmetric unit of the title compound, [Zn2(C25H20N4)3](BF4)4·3CH3CN, consists of one dinuclear ZnII complex cation with a triple-helical [Zn2L3]4+ motif (L is bis{4-[(pyridin-2-ylmethylidene)amino]phenyl}methane), four BF4− anions and three CH3CN solvent molecules. The Zn...Zn separation is 11.3893 (14) Å and the ligands wrap around the two ZnII atoms, forming a triple helix as defined by the Zn—N—N—Zn torsion angles of 104.05 (18), 99.06 (19) and 101.40 (19)°. The Zn—N(pyridyl) distances in the octahedral ZnN6 coordination sphere are in the range 2.128 (5)–2.190 (5) Å and the Zn—N(imine) distances are in the range 2.157 (5)–2.277 (5) Å.

Keywords

• crystal structure
• ZnII complex
• triple-helical motif