ATRP of MMA initiated by 2-bromoisobutyric acid 4-(2- benzothiazole-2-yl-vinyl)-phenyl ester (BPBVE) and its fluorescent property in the presence of metal ions

Abstract

2-Bromoisobutyric acid 4-(2-benzothiazole-2-yl-vinyl)-phenyl ester (BPBVE) was used for the heterogeneous atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) with a copper(I)bromide/2,2'-bipyridine catalytic system. Factors such as the reaction temperature and mole ratio of catalyst to initiator, which could affect the ATRP system, were discussed in the paper. The functional end group was characterized via UV-vis and 1 H NMR spectroscopy. The rates of polymerizations exhibited first-order kinetics with respect to the monomer, and a linear increase in the number-average molecular weight with increasing monomer conversion was observed for these initiation systems. The polydispersity indices (PDI) of the polymer were relatively low (1.07-1.23) up to high conversions. This PMMA with BPBVE as end group shows strong emission at blue-light area whether in solution or in solid. In particularly, emission was decreased (or quenched) with appearance of metal cations (Zn 2+ , Co 2+ , Ni 2+ , Pb 2+ , Mn 2+ , Cu 2+ , Fe 3+ , Ag + ) in DMF solution.

Preparation, spectroscopic characterization and study of biological activity as anticancer of some compounds using a new azo-Schiff base ligand (N,N,O) derived from 2-amino-5-methyl thiazol

“…Thiazole is a strong pale-yellow liquid by a boiling point of 116 -118 ºC, solvable in ehtanol and ether but abstemiously solvable in water (7) . The heterocyclic ring of thiazole contains a delocalisation of 6 π electrons consistent to Huckel's rule from the lone pair electrons, which is the sulphur atom (8) . A thiazole is a 3-dimensional compound that has been synthesized from synthetic, natural plants, marine organisms, as well as by using green chemistry methods (which includes the use of green solvents, catalysts, solid-phase preparation, microwave irradiation, and ultrasonication) (9) .…”