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Circular Dichroism Spectroscopy Study of Crystalline‐to‐Amorphous Transformation in Chiral Platinum(II) Complexes
Author(s) -
Zhang XiaoPeng,
Wu Tao,
Liu Jian,
Zhao JinCheng,
Li ChengHui,
You XiaoZeng
Publication year - 2013
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.22149
Subject(s) - amorphous solid , vibrational circular dichroism , chemistry , circular dichroism , crystallography , platinum , spectroscopy , tetragonal crystal system , crystal structure , analytical chemistry (journal) , photochemistry , organic chemistry , physics , quantum mechanics , catalysis
Two couples of enantiomeric platinum(II) complexes: Pt(L 1a )Cl ( 1a ), Pt(L 1b )Cl ( 1b ) and Pt(L 1a )(C ≡ C − Ph) ( 2a ), Pt(L 1b )(C ≡ C − Ph) ( 2b ) (L 1a = (+)‐1,3‐di‐(2‐(4,5‐pinene)pyridyl)benzene, L 1b = (−)‐1,3‐di‐(2‐(4,5‐pinene)pyridyl)benzene) were synthesized and characterized. Their absolute configurations were determined by single crystal X‐ray diffraction and further verified by circular dichroism (CD) spectra (including electronic circular dichroism [ECD] and vibrational circular dichroism [VCD]). These complexes show interesting mechanoluminescence and/or vapoluminescence due to crystalline‐to‐amorphous transformation. The crystalline solids, grinding‐induced amorphous powders, and vapor‐induced amorphous powders of complexes 2a and 2b were comparatively investigated by solid‐state ECD and VCD spectra. The transformation from crystalline solids to amorphous powders was accompanied by significant variances of the spectral feature in both ECD and VCD spectra. Chirality 25:384–392, 2013 . © 2013 Wiley Periodicals, Inc.