2-(1-{3-(dimethylazaniumyl)propylmethylamino}ethylidene)azaniumyl­nona­hydro-closo-deca­borate dimethyl sulfoxide disolvate

摘要

The title compound, 2-B10H9NH=C(CH3)N(CH3)CH2CH2CH2N(CH3)2H·2C2H6OS or C8H29B10N3·2C2H₆OS, is zwitterionic with the negative charge localized on the deca­borate cage and the positive charge on the terminal ammonium group. Two mol­ecules of dimethyl sulfoxide (DMSO) and one mol­ecule of the title compound constitute the asymmetric unit. One DMSO mol­ecule is disordered [ratio 0.739 (3):0.261 (3)]. The bonds and angles within the deca­borate cage are within the normal ranges. The amidine fragment of the ligand, which is expected to be planar, is significantly distorted from planarity as exemplified by four torsion angles [B—N—C—C = 8.4 (3), H—N—C—N = 5(2), N—C—N—C = 7.3 (3) and C—C—N—C = 14.8 (3)°] found within this portion of the mol­ecule. The crystal packing consists of head-to-tail-arranged dimers of the title mol­ecule held together by four mol­ecules of DMSO which are attached via strong N—H⋯O and weak C—H⋯O hydrogen bonds.