Solvent- and DNA-Controlled Phototriggered Linkage Isomerization in a Ruthenium Sulfoxide Complex Incorporating Dipyrido[3,2-a:2',3'-c]phenazine (dppz).

Title Solvent- and DNA-Controlled Phototriggered Linkage Isomerization in a Ruthenium Sulfoxide Complex Incorporating Dipyrido[3,2-a:2',3'-c]phenazine (dppz).
Authors D. Phapale; R. Ghosh; D. Das
Journal Inorg Chem
DOI 10.1021/acs.inorgchem.7b00412
Abstract

A new tris-heteroleptic complex [Ru(bpy)(dppz)(OSO)](ClO4), [1](ClO4) (bpy = 2,2'-bipyridine, dppz = dipyridophenazine and OSO = 2-methylsulfinylbenzoate), was synthesized and characterized to control the photochromic Ru-S ? Ru-O linkage isomerization. Details isomerization kinetics studied by UV-visible absorption spectroscopy and cyclic voltammetry revealed that efficient photochromic S ? O isomerization and thermal O ? S reversal take place in solvents like propylene carbonate (PC), methanol, and dichloromethane. Strikingly, photoisomerization of [1](ClO4) is arrested in water although is active in the analogous compound [Ru(bpy)2(OSO)](ClO4). Effective excited state deactivation through dark (3)MLCT state involving dppz ligand of [1](ClO4) switches off photochromism in aqueous medium. Interestingly, the photochromism is activated in aqueous solution in the presence of DNA which shields the dppz localized dark state through intercalation. Ultrafast transient absorption spectroscopic measurement sheds light on the differential behavior of photochromism in aqueous and nonaqueous solvents.

Citation D. Phapale; R. Ghosh; D. Das.Solvent- and DNA-Controlled Phototriggered Linkage Isomerization in a Ruthenium Sulfoxide Complex Incorporating Dipyrido[3,2-a:2',3'-c]phenazine (dppz).. Inorg Chem. 2017;56(11):63106317. doi:10.1021/acs.inorgchem.7b00412

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Sulfur

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