Molecular polygons, chiral

Figure4.12 Self-assembly of chiral Pt-alkynyl molecular polygons.

When the linear trans-[Pt(PEt3)2Cl2] was used to connect the bis (alkyne) ligand 15a-c, a mixture of different sizes of chiral metallocycles [trans-(PEt3)2Pt(15a-c)] , (rt = 3-8,19-24) was obtained [26], Each of the chiral molecular polygons 19-24 was purified by silica-gel column chromatography and analytically pure 19-24 was obtained in yields (%) of 5,18,16,10,5, and 4, respectively (Figure 4.12). Compounds 19-24 have been characterized by H, and P H NMR spectroscopy,... 

FAB and MALDI-TOF MS, and IR, UV/Vis, and circular dichroism (CD) spectroscopies, and microanalysis. The limited conformational flexibility of the bridging ligand is key to the facile one-pot self-assembly of chiral molecular polygons 19-24. 

Jiang, H, and Lin, W. (2005) Chiral molecular polygons based on the Pt-alkynyl linkage Self assembly, characterization, and functionalization. 

Self-assembly of chiral molecular polygons (reproduced with permission from reference... 

Chiral molecular polygons have been prepared via treatment of either (R)- or (S)-254 with [trans-PtCl2(PEt3)2] (Scheme 6.34) [89]. This one-pot reaction affords a mixture of polygons 255-260, with highest yields observed for the tetramer 256... 

Scheme 10.16. Chiral platinum-containing molecular polygons with potential enantioselective catalytic activities.

Fig. 5.15 Schematical illustration of photoisomerization of molecular motor, a Molecular structure of chiral motor 21. b Polygonal texture of a LC film doped with 1 wt% chiral motor 21. c Glass rod rotating on the LC during irradiation with ultraviolet light. Frames 1-4 (from l ) were taken at 15 s intervals and show clockwise rotations of 28° (Irame 2), 141° (frame 3) and 226° (Same 4) of the rod relative to the position in fiame 1. Scale bars, 50 pm. d Surface structure of the liquid-crystal film (atomic force microscopy image 15 pm ). Reproduced with permission from [103]. Copyright 2006 Nature Publishing Group...

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