[摘要]：A new approach wherein steric interactions between substituents of unsym. bis(4-pyridyl)acetylene ligands in platinum complexes dictate the self-selection of single isomers of [4 + 4] self-assembled squares is presented. Each [4 + 4] self-assembly was characterized by multinuclear 31P and 1H NMR spectroscopies and electrospray ionization mass spectrometry. NMR spectroscopic studies were used to provide a means of evaluating the efficiency of bulky substituents at proximal or remote positions relative to the Pt-N bonding motif to direct self-selection. Mol. modeling using the MMFF force field was used to det. the relative energy of different isomers of each assembly, and modeling results reasonably explain the trend in self-selectivity with varying pyridyl substitution.
