Facile Assembly of Chiral Metallosquares Using Enantiopure Tribenzotriquinacene Corner Motifs
A pair of enantiomerically pure metallosquares based on linear platinum-diacetylene edges and tribenzotriquinacene corner units was synthesized. Their structures were characterized by 1H-, 13C- and 31P-NMR spectroscopy as well as MALDI-ToF mass spectrometry and circular dichroism (CD) spectroscopy. Based on DFT calculations, the optimized geometry possesses a distorted square conformation in which the four edges are not sitting on the same plane. The molecular square further self-assembled in the solid state to afford microspheres with diameter of ≈300 nm, as determined by scanning electron microscopy (SEM).

Wen-Rong Xu, Guang-Jie Xia, Hak-Fun Chow, Xiao-Ping Cao and Dietmar Kuck, Chem. Eur. J. 2015, 21, 12011–12017 [DOI: 10.1002/chem.201501556]