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Synthesis, structural characterization and in vitro cytotoxic activity of novel polymeric triorganotin(IV) complexes of urocanic acid
Author(s) -
CamachoCamacho Carlos,
RojasOviedo Irma,
GarzaOrtiz Ariadna,
Cárdenas Jorge,
Toscano Rubén Alfredo,
Gaviño Rubén
Publication year - 2013
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.2937
Subject(s) - chemistry , trigonal bipyramidal molecular geometry , stereochemistry , urocanic acid , denticity , carboxylate , tin , ligand (biochemistry) , imidazole , crystallography , crystal structure , amino acid , organic chemistry , histidine , biochemistry , receptor
Two novel triorganotin carboxylate complexes of the biologically active urocanic acid have been synthesized and characterized. Elemental analysis, melting point, spectroscopic techniques – IR, 1 H, 13 C and 119 Sn NMR – mass spectrometry and X‐ray diffraction studies have been used for structural characterization. Crystal structures of the tin(IV) derivatives show that urocanic acid acts as a bridging bidentate ligand through its imidazole nitrogen atom and its carboxylic group, producing a polymeric one‐dimensional chain. The molecular structures of the complexes, catena ‐poly‐tri( n ‐butyl)tin(IV) 3‐(3 H ‐imidazol‐4‐yl)prop‐2‐enoate (1) and catena ‐poly‐triphenyltin(IV) 3‐(3 H ‐imidazol‐4‐yl)prop‐2‐enoate (2), present a distorted trigonal–bipyramidal configuration. This is further confirmed by 119 Sn NMR in the solid state. The tin(IV) derivatives form double‐stranded ribbons via N―H … O―H bonds. Nevertheless, the compounds are essentially monomeric in solution, with a tetrahedral configuration as observed by 119 Sn NMR in solution. The cytotoxic activity of the titled compounds has been tested against six human cell lines and the corresponding IC 50 values are reported. Both tin(IV) compounds have a high to very high in vitro cytotoxic activity against the tumor cell lines K562, HCT‐15 and MCF‐7. Compound 1 is 86 times more active than cisplatin in the HTC‐15 cell line. Copyright © 2012 John Wiley & Sons, Ltd.