Non-classical hydrogen bonds (C–H⋯X, X = Cl and N) induced 3D architecture: Trigonal bipyramidal ferric complex, [Fe(btp)Cl3]n (btp = 2,6-bis(N1-1,2,4-triazolyl)pyridine)

The slow diffusion reaction of a solution of FeCl3 · 6H2O in acetone into a CH2Cl2 solution of btp [2,6-bis(N1-1,2,4-triazolyl)pyridine] afforded the ferric complex, [Fe(btp)Cl3]n (1), in which the iron centre adopts a trigonal bipyramidal geometry. Three chloride ligands occupy the vertices of the trigonal plane and two nitrogen atoms of btp ligands complete the trigonal bipyramidal geometry. Interestingly, 1 shows a 3D architecture induced by non-classical C–H⋯Cl and C–H⋯N hydrogen bonds between 1D zigzag chains in which btp ligands bind ferric ions through coordination bonds.

Graphical abstractThe reaction of FeCl3 · 6H2O with btp afforded the trigonal bipyramidal ferric complex, [Fe(btp)Cl3]n (1) consisting of three chloride ligands and two nitrogen atoms of btp. Interestingly, in 1, a 3D architecture is induced by non-classical C–H⋯Cl and C–H⋯N hydrogen bonds between 1D zigzag chains in which btp ligands bind ferric ions through coordination bonds.Figure optionsDownload full-size imageDownload as PowerPoint slide