Triarylmethanol host compounds. Synthesis, crystalline complex formation and X-ray crystal structures of three inclusion species

A variety of triarylmethanol compounds including benzo condensed and laterally substituted derivatives 1-10 have been prepared and shown to act as crystalline hosts for the inclusion of organic solvents involving protic polar, aprotic dipolar and apolar molecules. The inclusion ability is rather high for aprotic dipolar solvents while protic polar compounds are only rarely enclathrated. Host 9 is an exception, being also efficient with alcohols and amines. Compound 3 displays no inclusion formation under the experimental conditions. X-ray crystal structures of the inclusion compound 1·acetone (2:1) and of two amine inclusion compounds of host9 [9·n-propylamine (1:1), 9·di-n-propylamine (1:1)] are reported showing the formation of H-bonded host-guest associates as the common feature of supramolecular association.