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Example of Disulfide Conformational Change in the Solid State: Preparation, Optical Properties, and X‐ray Studies of a Cystamine‐Based Iodoplombate Hybrid
Author(s) -
Louvain Nicolas,
Mercier Nicolas,
Luc Jerôme,
Sahraoui Bouchta
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800525
Subject(s) - cystamine , chemistry , orthorhombic crystal system , crystallography , octahedron , diffraction , powder diffraction , solid state , disulfide bond , x ray crystallography , crystal structure , stereochemistry , biochemistry , physics , optics
A novel cystamine‐based hybrid, namely, α‐[{NH 3 (CH 2 ) 2 SS(CH 2 ) 2 NH 3 }PbI 6 ] · 2H 3 O ( 1a ), was prepared under solvothermal conditions. Interestingly, 1a , which is built up from isolated PbI 6 octahedra, can be easily changed into its polymorph, namely, β‐[{NH 3 (CH 2 ) 2 S–S(CH 2 ) 2 NH 3 }PbI 6 ] · 2H 3 O ( 1b ) only by heating it up to 45 °C. According to the results of X‐ray diffraction analyses, the polymorphic phenomenon of 1a and 1b results from a conformational change in the helical diprotonated cystamine cation in the solid state. Both 1a and 1b crystallized in the orthorhombic Pna 2 1 space group. The reversibility of this transformation is proved by single‐crystal X‐ray diffraction and second harmonic generation measurements.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)