Rajneesh Misra, Thaksen Jadhav, Bhausaheb Dhokale and Shaikh M. Mobin
Chem. Commun., 2014,50, 9076-9078
DOI:
10.1039/C4CC02824D,
Communication
Tetraphenylethene (TPE) substituted phenanthroimidazoles 3a and 3b were designed and synthesized by the Suzuki cross-coupling reaction. They show reversible mechanochromic behavior with contrast colors between sky-blue and yellow green. The powder XRD studies show that destruction of a crystalline state into an amorphous state is responsible for mechanochromism. Hydrogen bonding interaction of a cyano-group in 3b results in enhanced AIE and improved thermal stability.