Title
Tuning of Supramolecular Architectures of l-Valine-Containing Dicyanoplatinum(II) 2,2’-Bipyridine Complexes by Metal–Metal, p–p Stacking, and Hydrogen-Bonding Interactions
Author
Heidi Li-Ki Fu, Charlotte Po, Hexiang He, Sammual Yu-Lut Leung, Kam Sing Wong, Vivian Wing-Wah Yam
Year
2016
Journal
Chemistry A European Journal
Abstract
A series of newly synthesized dicyanoplatinum(II) 2,2’-bipyridine complexes exhibits self-assembly properties in solution after the incorporation of the l-valine amino units appended with various hydrophobic motifs. These lvaline-derived substituents were found to have critical control over the aggregation behaviors of the complexes in the solution state. On one hand, one of the complexes was found to exhibit interesting circularly polarized luminescence (CPL) signals at low temperature due to the formation of chiral spherical aggregates in the temperature-dependent studies. On the other hand, systematic transformation from less uniform aggregates to well-defined fibrous and rod-like structures via Pt···Pt and p–p stacking interactions has also been observed in the mixed-solvent studies. These changes were monitored by UV/Vis absorption, emission, circular dichroism (CD), and CPL spectroscopies, and morphologies were studied by electron microscopy
Instrument
J-815
Keywords
Circular dichroism, Circularly polarized luminescence, Thermal stability, Coordination chemistry, Stereochemistry, Aggregation, Materials