The C-H...[FBF3](-) hydrogen bonds as origin of the linear polytetrameric self-organisation of Schiff base containing substituted 1,2,4-triazole

The first crystal structure involving Schiff base containing 4-substituted 1,2,4-triazolium cation is reported. The neutral (4-chloro-benzylidene)-[ 1 ,2,4] triazol-4-yl-amine (T) and protonated (HT+) molecules are connected b y the strong [N-H... N](+) hydrogen bond forming the discrete dimers. The p air of the dimers and two BF4 ions are linked via the weak C-H... F interac tions and create tetrameric units. BF, ions mediate between succeeding tetr amers and as a result double ribbons along [110] are formed. No intermolecu lar, directional interactions between neighbour ribbons in the crystal were found.