Synthesis and crystal structure of [1-(4′-bromo-2′-fluorobenzyl)pyridinium]2[Ni(mnt)2] and [1-(4′-bromo-2′-fluorobenzyl)pyrazinium]2[Ni(mnt)2] complex (mnt2-= maleonitriledithiolate dianion)

Two complexes [1-(4'-bromo-2'-fluorobenzyl) pyridinium](2)[Ni (mnt)(2)] (1) and [1-(4'-bromo-2-fluorobenzyl) pyrazinium](2)[Ni(mnt)(2)] (2) (mnt(2-) denotes maleonitriledithiolate dianion) have been prepared by reactions of Na2 [Ni(mnt)(2)] with the corresponding 1-(4'-bromo-2'-fluorobenzyl) pyridinium bromide and 1-(4'-bromo-2'-fluorobenzyl) pyrazinium bromide salt. The crystallographic data for the complex 1: Triclinic P (1) over bar, a = 0.7086 (2) nm, b = 1.0968(3) nm, c = 1.1775(3) nm, alpha = 69.914(5)degrees, beta = 89. 495(5)degrees, gamma = 74. 765(5)0, V = 0. 8259(4) nm(3), Z = 1. Complex 2: Monoclinic P2(1)/n, a = 0. 71554 (17) nm, b = 1. 4262 (3) nm, c = 1. 6725 (4) run, 6 = 100.396(4)degrees, V=1.6788(7) nm(3), Z = 4. In these two complexes, the Ni atom of [Ni(mnt)(2)](2-) anion lies on an inversion center and complex anion exhibit a quasi-planar structure. The nature and size of cation seems to play an important role in the type of intermolecular interactions as well as the crystal packing in this series of complexes.