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Dichloridobis(pyridine-2-thiol-ato-κ²N,S)tin(IV): a new polymorph.

Sheyda R Ismaylova1, Zhanna V Matsulevich, Galina N Borisova

  • 1Baku State University, Z. Khalilov St 23, Baku AZ-1148, Azerbaijan.

Acta Crystallographica. Section E, Structure Reports Online
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PubMed
Summary

This study details the synthesis and crystal structure of a tin(IV) compound, [SnCl₂(C₅H₄NS)₂]. Researchers identified a new monoclinic polymorph, revealing distinct intermolecular interactions compared to a previously studied triclinic form.

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Area of Science:

  • Inorganic Chemistry
  • Crystal Engineering
  • Coordination Chemistry

Background:

  • The synthesis of novel organotin compounds provides insights into coordination chemistry.
  • Polymorphism in coordination compounds can significantly influence material properties.
  • Understanding intermolecular forces is crucial for predicting crystal packing and stability.

Purpose of the Study:

  • To synthesize and characterize a new tin(IV) complex, [SnCl₂(C₅H₄NS)₂].
  • To determine the crystal structure of the monoclinic polymorph.
  • To compare the structural features and intermolecular interactions with a previously reported triclinic polymorph.

Main Methods:

  • Reaction of 2,2'-dipyridyl disulfide with tin tetrachloride.
  • Single-crystal X-ray diffraction analysis to determine the molecular and crystal structure.
  • Analysis of intermolecular interactions (hydrogen bonding, S⋯S interactions) and crystal packing.

Main Results:

  • A new monoclinic polymorph of [SnCl₂(C₅H₄NS)₂] was obtained and characterized (space group C2/c).
  • The tin(IV) center exhibits a distorted octahedral geometry with bidentate pyridine-2-thiolate ligands.
  • Distinct intermolecular interactions, C-H⋯Cl hydrogen bonds in the monoclinic form versus S⋯S interactions in the triclinic form, dictate crystal packing.

Conclusions:

  • The formation of different polymorphs is governed by variations in intermolecular forces.
  • The study highlights the sensitivity of crystal structure to subtle changes in molecular assembly.
  • This work contributes to the understanding of tin(IV) coordination chemistry and polymorphism.