Studies of third-order optical nonlinearities of model compounds containing benzothiazole, benzimidazole and benzoxazole units

Spectral dispersion of second molecular hyperpolarizability of diacetylene derivatives: Correlation with electronic and chemical structure

“…A comparison of the results for three symmetrically substituted diacetylenes 3TNDA, 1DNDA and 3DQDA at 810 nm shows that the aryl substituents containing a heteroatom such as N and S produce large transition dipole moment 01 and hence higher nonlinearity. This is consistent with the recent observations in oligomers of conjugated rigid-rod polymer PBO and PBZT 34,35 where the sulphur heteroatom substitution enhanced the nonlinearity by a factor of 3. From our studies, it seems that N heterocyclic substitution is more effective than the S heterocyclic substitution for achieving higher nonlinearity.…”

One pot synthesis of benzoxazoles, benzthiazoles and benzimidazoles from carboxylic acids using ionic liquid

“…[1][2][3][4][5] These heterocycles exhibit pharmacological activities such as antiviral, 6 antimicrobial, 7 antifungal, 8 antiparkinson, 9 anticancer 10 and antibiotic 11 properties.…”

Synthesis and crystal structure determination of copper(II) and iron(III) complexes of 2-(2-pyridyl)benzothiazole

“…They have also been studied for use in photodegradation of poly(vinylcholoride) (PVC) as photo-sensitisizers [7]. Model compounds containing the benzothiazole unit have much interest for their optical properties [8]. They have also been used as organic luminophores [5,6].…”

“…Various methods are available for the preparation of the benzothizole moiety [1, 5,8,10,[14][15][16][17] and recently several attempts have been made to develop new methods [2,18,19]. The crystal structure of pbt was reported in 1990 [20].…”