Bis[tris(pyridin-2-yl)amine]iron(II) tris(dicyanomethylidene)methanediide

Abstract

In the title compound, [Fe{(C5H4N)3N}2][C{C(CN)2}3], both ions lie across centres of inversion, with the anion being statistically disordered over two sets of atomic sites having equal occupancy. The cation and anion have approximate \overline{3} and 32 symmetry, respectively, and the Fe—N bond lengths indicate low-spin FeII. A combination of two-centre C—H...N and three-centre C—H...(N)2 hydrogen bonds link the ions into complex sheets. Several low-occupancy water molecules are present, whose H atoms could not be located: accordingly, the reflection data were subjected to the SQUEEZE procedure [Spek (2015). Acta Cryst. C71, 9–18].

Solvothermal synthesis and crystal structures of two new cadmium coordination polymers containing polynitrile ligands

“…Two of these small bridging polynitrile ligands that have received a lot of attention in the past decade are the dicyanamide, [N(CN) 2 ] À (dca), and tricyanomethanide [C(CN) 3 ] À (tcm), ions. This is partly due to their ability to produce a wide variety of coordination compounds with different nuclearity ranging from simple mononuclear to polynuclear species with complex structures (Batten & Murray, 2003;Setifi, Setifi, Saadi et al, 2014;S ´witlicka-Olszewska et al, 2016). Different bonding modes are observed in the polynuclear complexes bridged by the dca and tcm ligands, which results in the formation of polymeric assemblies in one, two or three dimensions (Batten & Murray 2003).…”