Trimethyltin dicyanamide

Trimethyltin dicyanamide and dimethyltin bis(dicyanamide) both have the same type of bonding by the NC-N-CN groups, but the tin co-ordination is trigonal bipyramidal in the former (Figure 6) and octahedral in the latter... 

Trimethyltin(IV) dicyanamide, Me3Sn[N(CN)2], and dimethyltin(IV) bis-(dicyanamide), Me2Sn[N(CN)2]2, are also self-organized into supramolecular arrays [286]. The trimethyltin derivative contains Sn- -NCNCN- chains, 116, with five-coordinate, trigonal bipyramidal tin), whereas the dimethyltin compound forms an infinite two-dimensional layer, 117, of six-coordinate octahedral tin atoms bridged... 

---