PERYLENE DERIVATIVE CHARGE-TRANSFER SALTS - SYNTHESIS, CRYSTAL-STRUCTURE AND CHARACTERIZATION OF (PET)(3)[NI(MNT)(2)](2)

(pet)(3)[Ni(mnt)(2)](2) single crystals, where pet = perilo [1,12-b,c, d] thiophene and mnt = maleonitriledithiolate (cis-2,3-dimercapto-bute ne-2,3-dinitrile), were obtained by electrocrystallisation from dichlo romethane solutions of pet and the tetrabutylammonium salt of [Ni(mnt) (2)](-). The crystal structure is triclinic, space group P1, with cell parameters a=10.2972(9), b=11.5037(12), c=13.3297(10) Angstrom, alpha =78.320(8) degrees, beta=87.096(7) degrees, gamma=87.785(8) degrees, Z = 1 and consists of segregated stacks along a of partially oxidised p et molecules arranged as trimers, (pet)(3)(2+), and dimerised [Ni(mnt) (2)](-) anions; The electrical properties are typical of a semiconduct or with room-temperature conductivity of ca. 9 S cm(-1) with an activa tion energy of 168 meV, and the paramagnetic susceptibility is due to a singlet-triplet type contribution of antiferromagnetically coupled p airs of S = 1/2 spins of the [Ni(mnt)(2)](-) species with J/k(B) = -22 6 K.