Elsevier

Polyhedron

Volume 23, Issue 9, 27 May 2004, Pages 1629-1639
Polyhedron

Molecular aggregates, zig-zag 2D-stairs, -ribbons and 3D-supramolecular networks of cyclic telluranes assisted by intermolecular Te  Cl and Te  Br secondary bonding

https://doi.org/10.1016/j.poly.2004.03.019Get rights and content

Abstract

The metathetical reactions of cyclic telluranes: C4H8TeI2, C5H10TeI2, C8H8TeI2, with AgX (X=Cl, Br) yield C4H8TeCl2 (1), C4H8TeBr2 (2), C5H10TeBr2 (3), C8H8TeCl2 (4) and C8H8TeBr2 (5). Reactions of C4H8TeI2 or C8H8TeI2 with [Et4N]CI give X-ray quality crystals of C4H8TeCl2 (1) and C8H8TeCl2 (4). The X-ray structures of 15 reveal that in each case the primary geometry around Te is distorted pseudo trigonal bipyramidal where two Cl or Br atoms are at the axial positions whereas the three equatorial positions are occupied by two –CH2– groups of the cycle and, apparently, one stereochemically active electron lone pair. The Te  Cl and Te  Br secondary bonds in 15 act as crystal structure directors yielding zig-zag 2D-stairs in 1 and zig-zag 2D-ribbons in 2, trimeric molecular aggregates in 3 and 3D-supramolecular networks in 4 and 5. The supramolecular associations of these cyclic telluranes 15 are compared with the supramolecular associations in their precursors and in acyclic telluranes.

Te  Cl and Te  Br secondary bonds assisted molecular aggregates zig-zig 2D-stairs, -ribbons of cyclic telluranes in 13 and 3D-supramolecular networks in 4 and are described after 5. The supramolecular associations of these cyclic telluranes 15 are compared with the supramolecular associations in their precursors and in acyclic telluranes (C4H8TeCl2,C4H8TeBr2,C5H10TeBr2,C8H8TeCl2.C8H8TeBr2).

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Results and discussion

The complexes (15) have been synthesized by metathetical reactions of (C4H8TeI2 [18], C5H10TeI2 [19a], C8H8TeI2 [20]) with freshly prepared silver salts AgX (X=Cl, Br) or [Et4N]Cl. Metathetical reactions with [Et4N]Cl have not been so far reported in case of organotellurium iodides. Moreover it is interesting to note that this method affords X-ray quality crystals, which are not obtained when exchange is carried out with silver salts. Previously solids of C4H8TeCl2 and C4H8TeBr2 have been

Experimental

1,4-diiodobutane, 1,5-diiodopentane, α,α-dibromoxylene, Te metal and NaI were procured from Aldrich and used as such. 2-Methoxyethanol, benzene and acetone were purified and dried by standard procedures. The (precursors) cyclic telluranes viz. C4H8TeI2 [18] (reaction of 1,4-diiodobutane with Te metal in the temperature range 130–140 °C), C5H10TeI2 [19a] (reaction of 1,5-diiodopentane with Te metal at 150 °C) and C8H8TeI2 [20] (reaction of α,α-dibromoxylene, Te metal and NaI in

Supplementary material

Crystallographic data for the structural analyses have been deposited with the Cambridge Crystallographic Data Centre, CCDC nos. 222539 for C4H8TeCl2 (1), 226695 for C4H8TeBr2 (2), 226696 for C5H10TeBr2 (3), 222541 for C8H8TeCl2 (4) and 222540 for C8H8TeBr2 (5). Copies of this information may be obtained free of charge from The Director, CCDC, 12 Union Road Cambridge CBZ 1EZ, UK (fax: +44-1223-336033; email [email protected] or www.http//www.ccdc.cam.ac.uk).

Acknowledgements

P.C.S. is thankful to the Department of Science and Technology, Government of India for the financial support.

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