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Organotin Complexes of Alizarin and Purpurin
Author(s) -
de Sousa Adriana T.,
Bessler Karl E.,
Lemos Sebastia˜o S.,
Ellena Javier,
Gatto Claudia C.
Publication year - 2009
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200800313
Subject(s) - alizarin , tin , chemistry , pentagonal bipyramidal molecular geometry , bipyramid , crystallography , crystal structure , anthraquinone , chelation , oxygen atom , stereochemistry , molecule , inorganic chemistry , nuclear chemistry , organic chemistry
Abstract Five novel organotin complexes with the anthraquinone dyes alizarin (1,2‐dihydroxyanthraquinone) and purpurin (1,2,4‐trihydroxyanthraquinone) were synthesized and characterized by elemental analyses, FTIR and NMR spectroscopy ( 1 H, 13 C and 119 Sn). The crystal and molecular structures of four complexes were determined by X‐ray diffraction on single crystals: [Bu 2 Sn(aliz)(H 2 O)]·C 2 H 5 OH ( A1 ·EtOH), [Bu 2 Sn(aliz)(dmso)] 2 ( A3 ), [(Bu 2 Sn) 3 O(Hpurp) 2 ] ( P1 ) and [Bu 2 Sn(Hpurp)(dmso)] 2 ( P2 ), where H 2 aliz = alizarin and H 3 purp = purpurin. The coordination mode of the ligands is identical to that found in their Al/Ca complexes, where they act as dianionic tridentate ligands forming five and six‐membered fused chelate rings. The coordination to the tin atoms occurs exclusively via the 1,2‐ phenolate oxygen and the adjacent quinoid oxygen atoms. The complexes A1 , A3 and P1 are dimers with hepta‐coordinated tin atoms in form of a slightly distorted pentagonal bipyramid. The trinuclear complex P2 contains two pentacoordinated and one heptacoordinated tin atoms.