摘要:
Substitution of the 1,3,5-triphenyl-6-oxoverdazyl radical with n-alkylsulfanyl groups lead to derivatives 1[n], which exhibit a columnar rectangular phase (Col(r) ) below 60 degrees C. Compounds 1[n] have a broad absorption band in the visible region with maxima at 540 and 610nm and redox potentials E0/+1 (1/2) = +0.99V and E0/-1 (1/2) = -0.45V vs. SCE. Time-of-flight (TOF) investigation of 1[8] revealed hole mobility of (h) = 1.52 x 10(-3) cm(2) V-1 s(-1) in the columnar phase with an activation energy E-a = 0.06 +/- 0.01eV. Magnetization studies of 1[8] demonstrated nearly ideal paramagnetic behavior in both solid and fluid phases above 200K and weak antiferromagnetic interactions at low temperatures. Verdazyl derivatives 1[n] were prepared in a sequence of reactions starting from 1-bromo-3,4,5-trifluorobenzene by alkylsulfanylation, followed by hydrazinylation, and finally 6-oxoverdazyl ring assembly using the Milcent method.