Synthesis, spectroscopic, and structural characterization of new functionalized gem-bisphosphonate complexes of tin(IV) chloride

Marwa Yahyaoui, Med Abderrahmane Sanhoury, Cameron L. Carpenter-Warren, Alexandra Martha Zoya Slawin, J Derek Woollins, Soufiane Touil, Ali Samarat

Research output: Contribution to journalArticlepeer-review

Abstract

Bisphosphonates of the types X(P(O)(OEt)2)2 (X = CH2=C (1a), CNCH2CH (1b) and PhCH2NCH2CH (1c)) react with SnCl4 in anhydrous dichloromethane to produce the new tin(IV) adducts [SnCl4(1a)] (2a), [SnCl4(1b)] (2b) and [SnCl4(1c)] (2c) in 72-80% yields. These complexes were characterized using IR, multinuclear (1H, 13C, 31P, 119Sn) NMR spectroscopy, elemental analysis, and in one case by single crystal X-ray diffraction. The NMR data show that the bisphosphonate ligands are coordinated to the tin center in a bidentate fashion forming cis octahedral tin complexes. Furthermore, the X-ray structure of complex 2b reveals that the bisphosphonate ligand is coordinated in a bidentate manner to the metal center in a distorted octahedral arrangement with Sn-O-P bond angles in the range 135.95(16)–137.99(18)°. The P=O and Sn-O bond lengths of 1.495(3)-1.497(3) and 2.134(3)-2.146(2) Å, respectively are in the order expected for phosphonate tin(IV) complexes. The results are discussed and compared with closely related analogues.
Original languageEnglish
JournalChemical Data Collections
VolumeIn press
Early online date22 Nov 2018
DOIs
Publication statusE-pub ahead of print - 22 Nov 2018

Keywords

  • gem-Bisphosphonates
  • tin(IV) chloride
  • 119Sn and 31P NMR
  • X-ray structure

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