Na. Sanina et al., Influence of the cation on the properties of binuclear iron nitrosyl complexes. Synthesis and crystal structure of [(Pr4N)-N-n](2)[Fe2S2(NO)(4)], RUSS CHEM B, 49(6), 2000, pp. 1109-1112
The binuclear nitrosyl complexes Q(2)[Fe2S2(NO)(4)], where Q = Me, Er, Pr-n
, and Bu-n, were synthesized. The crystals of [(Pr4N)-N-n](2)Fe2S2(NO)(4) w
ere Studied by X-ray analysis. The influence of the cation size on the elec
tronic structure and symmetry of its local environment in the synthesized c
omplexes was examined. The decrease in the isomeric shifts in the Fe-57 Mos
sbauer spectra is related to the increase in the length of the alkyl substi
tuent chain of the quaternary tetraammonium cation and is consistent with c
hanging the structural parameters: a decrease in the bond angle of the Fe-N
O bond and stretching vibrations of the NO groups due to changes in intermo
lecular contacts.