Crystal structures of bis[2-(pyridin-2-yl)phenyl-κ²N,C¹]rhodium(III) complexes containing an acetonitrile or monodentate thyminate(1−) ligand

Abstract

Bis[2-(pyridin-2-yl)phen­yl]rhodium(III) complexes bearing aceto­nitrile or monodeprotonated thyminate (Hthym−) were characterized by X-ray analysis, and in the latter complexes it was revealed that Hthym− coordinated to an RhIII centre through the N1 atom together with a hydrogen-bonded methanol or ethanol co-ligand in the cis position.

A Gadolinium(III) Complex Based on the Thymine Nucleobase with Properties Suitable for Magnetic Resonance Imaging

“…Regarding lanthanide complexes, only two structures based on thyminate anion have been published so far, namely, the heteropolynuclear complexes of general formula [{Cp*Rh III (µ-thym)} 4 {Ln III (NO 3 ) 2 }] + , where Ln = Dy III and Er III , which form cationic metallacalix [4]arene-type systems [14]. Hence, no crystal structure of gadolinium complex based on thymine has been reported up to date.…”

“…In comparison with other natural nucleobases, the coordination chemistry of thymine-based metal complexes has been much less investigated. Most of the thymine-containing complexes have been prepared with the nucleobase in the form of thyminate anion, that is, releasing one or two protons of its N-H groups, whereas the reported examples obtained with the thymine molecule acting through its carbonyl groups as a neutral ligand toward the metal are much scarcer [ 4 , 5 , 6 , 7 ]. In that respect, theoretical studies have been performed on metal clusters to investigate the preferential binding sites of the thymine molecule [ 8 ].…”

A Gadolinium(III) Complex Based on the Thymine Nucleobase With Properties Suitable for Magnetic Resonance Imaging Applications

“…In comparison with other natural nucleobases, the coordination chemistry of thymine-based metal complexes has been much less investigated. Most of the thymine-containing complexes have been prepared with the nucleobase in form of thyminate anion, that is, releasing one or two protons of its N-H groups, whereas the reported examples obtained with the thymine molecule acting through its carbonyl groups as a neutral ligand toward the metal are much scarcer [4][5][6][7]. In that respect, theoretical studies have been performed on metal clusters to investigate preferential binding sites of the thymine molecule [8].…”

“…Regarding lanthanide complexes, only two structures based on thyminate anion have been published so far, namely, the heteropolynuclear complexes of general formula [{Cp*Rh III (µ-thym)}4{Ln III (NO3)2}] + , where Ln = Dy III and Er III , which form cationic metallacalix [4]arene-type systems [14]. Hence, no crystal structure of gadolinium complex based on thymine has been reported up to date.…”