Photo-Physical Transformations in Pyrazoline Derivative Based Systems

Discovery of E/Z or trans–cis photoisomerization in the azobenzenes and their derivatives had tremendous impact on the whole domain of photochromic materials including photochromic polymers and liquid crystals. Here we show similar configurational photoinduced transformation in a simple derivative of pyrazoline. The X-ray crystallographic investigations of (E)-3-(4-nitrostyryl)-1-phenyl-4,5-dihydro-1H-pyrazole (abbreviated as PY-pNO2) in grown...