Secondary bonds induced supramolecular assemblies in the crystals of 1,1,2,3,4,5-hexahydro-1,1-diiodotellurophene; 1,1,2,3,4,5,6-heptahydro-1,1-diiodotellurane and 1,3-dihydro-2λ4-benzotellurole-2,2-diyl diiodide

The comparative study of crystal structures of heterocyclic organotellurium diiodides viz. 1,1,2,3,4,5-hexahydro-1,1-diiodotellurophene (C4H8TeI2) (1); 1,1,2,3,4,5,6-heptahydro-1,1-diiodotellurane (C5H10TeI2) (2), and 1,3-dihydro-2λ4-benzotellurole-2,2-diyl diiodide (C8H8TeI2) (3), with respect to polymorphism, bond lengths, bond angles; (a) TeI; (b) TeC; (c) ITeI; (d) CTeC; (e) CTeI, and intermolecular secondary bonds; (f) Te⋯I; (g) ITe⋯I; and (h) CTe⋯I, are described. The structures of all heterocyclic organotellurium diiodides were established by single crystal X-ray diffraction studies. In each case a distorted octahedral (six-coordinate) geometry exists around tellurium atom with Te⋯I secondary bonds leading to 2-dimensional zigzag ribbons in 1, trimeric molecular aggregates in 2 while 3 is a 3-dimensional polymer.