Experimental and theoretical insight into the complexation behavior of spironaphthopyrans bearing o-positioning benzazole moietyстатья
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Дата последнего поиска статьи во внешних источниках: 14 августа 2017 г.
Аннотация:Metal coordination by spironaphthopyran derived merocyanines bearing benzazol substituents has been studied by means of experimental and theoretical methods. The formation of N-O coordinated chelate complexes have been observed by means of X-ray diffraction. Merocyanine scaffolds of these complexes possess trans-trans-cis conformation independently of both substituents in positions 1 and 5 of indoline moiety and benzazole heteroatom. Stability of merocyanine-metal complexes significantly depends on two factors: relative thermodynamic stability of spirocyclic and open isomers and complexation energy. Variation of the ligand structure involving chelating group significantly changes stability of complexes while replacement of the substituents in the indoline ring peripheral to the chelating parts of the molecules and biasing the spiropyran – merocyanine equilibrium provide the fine tuning of complexation selectivity. Complexes of diamagnetic ions (Mg2+, Zn2+, Cd2+) undergo photodissociation. The complexes of benzoxazole containing ligands demonstrate higher quantum yields comparing to their benzothiazole analogue.