Pyridylporphyrins peripherally coordinated to ruthenium-nitrosyls, including the water-soluble Na4[Zn·4′TPyP{RuCl4(NO)}4]: synthesis and structural characterization

Abstract

Several new ruthenium-nitrosyl conjugates with meso-4′pyridylporphyrins, namely the two anionic isomers [nBu₄N][trans-RuCl₄(4′MPyP)(NO)] (1) and [nBu₄N][cis-RuCl₄(4′MPyP)(NO)] (2), the two neutral isomers [mer,trans-RuCl₃(4′MPyP)₂(NO)] (3) and [mer,cis-RuCl₃(4′MPyP)₂(NO)] (4), and the tetraruthenated adduct [nBu₄N]₄[4′TPyP{RuCl₄(NO)}₄] (5) were obtained by reaction of [nBu₄N][trans-RuCl₄(dmso-O)(NO)] with 4′MPyP and 4′TPyP (meso-4′monopyridylporphyrin and meso-4′tetrapyridylporphyrin, respectively). The X-ray structures of 2, 4, and 5 are described. Exchange of nBu₄N⁺ for Na⁺ eventually led to the water-soluble tetraruthenated porphyrin Na₄[Zn·4′TPyP{RuCl₄(NO)}₄] (6·Zn).