Molecular aggregations of bicyclodioxazastannone produced from multicomponent reactions involving functionalized 2-hydroxybenzaldehydes, α- or β-amino acids and a dimethyltin precursor

Publication date: Available online 10 July 2019Source: Journal of Organometallic ChemistryAuthor(s): Tushar S. Basu Baul, Anurag Chaurasiya, Antonin Lyčka, Irán Rojas-León, Herbert HöpflAbstractA series of novel bicyclodioxazastannone derived from ONO Schiff base ligands prepared from diazenylaryl functionalized 2-hydroxybenzaldehydes and α or β-amino acetates, viz., [Me2Sn(L1)]2 (1), [Me2Sn(L2)]2 (2), [Me2Sn(L3)(MeOH)]2 (3), [Me2Sn(L4)]n (4), [Me2Sn(L5)]n⋅nH2O (5), [Me2SnL6)]2 (6), [Me2Sn(L7)] (7A), [Me2Sn(L7)]2⋅C8H10 (7B) and [Me2Sn(L8)]n (8), with variously substituted Schiff bases L1-L8 generated in situ, were synthesized and structurally characterized. The crystal structures of compounds 1–8 revealed different structure types with five-, six- or seven-fold coordination of the metal center. Except for 7A, which crystallized in the form of a discrete mononuclear tin complex, intermolecular association through O→Sn interactions was observed. The resulting aggregates were molecular dimers with a central four-membered Sn2O2 ring (1, 2, 6 and 7A), 1D coordination polymers (4, 5 and 8) and a solvent adduct linked through both O–H⋅⋅⋅O hydrogen bonds and O⋅⋅⋅Sn contacts (3). In the presence of hydrogen bond donors such as O–H and N–H groups in the ligands, the molecular structures are further interconnected through O/N–H⋅⋅⋅O hydrogen bonds, giving in combination with the O⋅⋅⋅Sn contacts overall 2D layer-type assemblies. In solution, c...

Source: Journal of Organometallic Chemistry - July 10, 2019 Category: Chemistry Source Type: research