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Triorganotin phosphonates polymeric chains-synthesis, Infrared, Mossbauer and single crystal characterization:The first organotin (IV) PH2–Bridged.

Two triorganotin(IV) phosphonate compounds were isolated and structurally investigated by infrared and Mössbauer spectroscopies and X-ray crystallography. The reaction oftrimethyltin(IV) chloride (SnMe3Cl) and hexamethylene tetraammonium hydrogen methylphosphonate [CH3PO3H][N4(CH2)6H] led to the formation of [C10H34O4P2Sn3] (1) which crystallizes in the Monoclinic space group Pn with Z = 2, a = 8.4955 (2) Å, b = 11.318 (3) Å, c = 11.902 (2) Å, ? = 90.9340 (10)° and V = 1144.2 (4) Å3. An uncommon decomposition of methylphosphonate occurred during the reaction process giving rise to the formation of dimers of [SnMe3PH2SnMe3]+. The structure of 1 consists of an anionic chain of [CH3PO3(SnMe3PH2SnMe3)]– linked to [SnMe3(H2O)]+ moieties through Sn—O bonds involving the remaining oxygen atoms of the methylphosphonates. In the chain, each SnMe3 residue is coordinated by one methylphosphonate and one phosphor atom, in a trans-trigonal bipyramidal PSnC3O geometry. The environment at tin atoms in both SnMe3 moieties is an octahedron. The methylphosphonate anion is otherwise in a general position and behaves as a tri-coordinating ligand. The reaction oftriphenyltin(IV) hydroxide (SnPh3OH) and phosphorous acid (HPO(OH)2) led to the formation of [C36H31O3PSn2] (2) which crystallizes in the Monoclinic space group P2/n with Z = 4, a = 11.7966 (4) Å, b = 10.1953 (4) Å, c =27.6715 (10) Å, ? = 94.600 (2)° and V = 3317.3 (2) Å3. The structure of 2 is comprised of an anionic chain of [HPO3(SnPh3)]– linked to SnPh3 moieties through Sn—O bonds involving the remaining oxygen atoms of the hydrogenphosphonates. In the chain the SnPh3 residues are each one coordinated by two hydrogenphosphonates in a trans-trigonal bipyramidal OSnC3O arrangement. The geometry at tin atoms within the monocoordinated SnPh3 moieties connected to the chain is a distorted tetrahedron. The hydrogenphosphonate anion is in a general arrangement and behaves as a tri-O-coordinating ligand.


Auteur(s) : Mouhamadou Birame Diop, Mouhamadou Sembène Boye, Aminata Diassé-Sarr, Libasse Diop, Philippe Guionneau et Thierry Maris
Pages : 266-278
Année de publication : 2019
Revue : International Journal of Advanced Research (IJAR).
N° de volume : 7
Type : Article
Mise en ligne par : BOYE Mouhamadou Sembène