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The architecture of the triphenylphosphine propeller in Cr-PPh3 complexes and in the compounds trans-[MCl2(PPh3)2], M=Ni, Pd, and Pt, is analyzed on the basis of a CSD search. The three phenyl rings interact with each other by formation of weak CH/π bonds comparable to the archetypal T-shaped benzene dimer. ortho-CH bonds from inside the propeller bind to ipso- and ortho-carbon atoms of adjacent phenyl...
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