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Photorelease of Pyridyl Esters in Organometallic Ru(II) Arene Complexes.

ABSTRACT: New Ru(II) arene complexes of formula [(?6-p-cym)Ru(N-N)(X)]2+ (where p-cym = para-cymene, N-N = 2,2'-bipyrimidine (bpm) or 2,2'-bipyridine (bpy) and X = m/p-COOMe-Py, 1-4) were synthesised and characterized, including the molecular structure of complexes [(?6-p-cym)Ru(bpy)(m-COOMe-Py)]2+ (3) and [(?6-p-cym)Ru(bpy) (p-COOMe-Py)]2+ (4) by single-crystal X-ray diffraction. Complexes 1-4 are stable in the dark in aqueous solution over 48 h and photolysis studies indicate that they can photodissociate the monodentate m/p-COOMe-Py ligands selectively with yields lower than 1%. DFT and TD-DFT calculations (B3LYP/LanL2DZ/6-31G**) performed on singlet and triplet states pinpoint a low-energy triplet state as the reactive state responsible for the selective dissociation of the monodentate pyridyl ligands.

SUBMITTER: Habtemariam A

PROVIDER: S-EPMC6272714 | biostudies-literature | 2015 Apr

REPOSITORIES: biostudies-literature

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Photorelease of Pyridyl Esters in Organometallic Ru(II) Arene Complexes.

Habtemariam Abraha A Garino Claudio C Ruggiero Emmanuel E Alonso-de Castro Silvia S Mareque-Rivas Juan C JC Salassa Luca L

Molecules (Basel, Switzerland) 20150421 4

New Ru(II) arene complexes of formula [(η6-p-cym)Ru(N-N)(X)]2+ (where p-cym = para-cymene, N-N = 2,2'-bipyrimidine (bpm) or 2,2'-bipyridine (bpy) and X = m/p-COOMe-Py, 1-4) were synthesised and characterized, including the molecular structure of complexes [(η6-p-cym)Ru(bpy)(m-COOMe-Py)]2+ (3) and [(η6-p-cym)Ru(bpy) (p-COOMe-Py)]2+ (4) by single-crystal X-ray diffraction. Complexes 1-4 are stable in the dark in aqueous solution over 48 h and photolysis studies indicate that they can photodissocia ...[more]

PMID: 25905605

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