Perylene Derivative Charge Transfer Salts: Synthesis Crystal Structure and Characterisation of (Pet)3[Ni(mnt)2]2

Jorge Manuel Ferreira Morgado; Isabel C. Santos; Luís Filipe Coelho Veiros; Rui Teives; Maria Teresa Duarte; Manuel Almeida; Luís Joaquim

Informações chave

Autores:

Jorge Manuel Ferreira Morgado (Jorge Manuel Ferreira Morgado); Isabel C. Santos; Luís Filipe Coelho Veiros (Luís Filipe Coelho Veiros); Rui Teives (Rui Teives Henriques); Maria Teresa Duarte (Maria Teresa Nogueira Leal da Silva Duarte); Manuel Almeida; Luís Joaquim (Luís Joaquim Alcácer)

Publicado em

1997

Resumo

(pet)3 [Ni(mnt)2 ]2 single crystals, where pet=perilo[1,12-b,c,d]thiophene and mnt= maleonitriledithiolate (cis-2,3-dimercapto-butene-2,3-dinitrile), were obtained by electrocrystallisation from dichloromethane 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) Å, alpha;=78.320(8) deg, beta;=87.096(7) deg, gamma;=87.785(8) deg, Z=1 and consists of segregated stacks along a of partially oxidised pet molecules arranged as trimers, (pet)3 2+ , and dimerised [Ni(mnt)2 ]- anions. The electrical properties are typical of a semiconductor with room-temperature conductivity of ca. 9 S cm-1 with an activation energy of 168 meV, and the paramagnetic susceptibility is due to a singlet-triplet type contribution of antiferromagnetically coupled pairs of S=1/2 spins of the [Ni(mnt)2]- species with J/kB=-226 K.