2,3,5-Metallotriazoles: Amphoteric Mesoionic Chelates from Nitrosoguanidines

Abstract

Soluble nitrosoguanidine- and N-methylnitrosoguanidine-based metallotriazole complexes of ruthenium­(II) monocarbonyls have been prepared and characterized. Both nitrosoguanidines prove to be strong chelates with the formally π-accepting nitroso nitrogen binding cis to carbon monoxide and a π-donating amide trans to the CO. The resulting ensemble consists of ruthenium examples of 1-metallo-2,3,5-triazoles. The ruthenium coordination sphere is completed by anions, either H–, Cl–, or Ph–, trans to the nitroso group as well as two mutually trans PPh3 groups. The π-donating amide group is formally sp2 hybridized with a planar nitrogen to give a strongly bound five-membered chelating anion. Together, these results illustrate the remarkable potential for the nitrosoguanidinates as a family of new metal chelates.

The isomer-sensitive electrochemical HER of ruthenium(ii)–hydrido complexes involving redox-active azoheteroaromatics

“…17,23 The collective impact of the back-bonding (azo) and trans effect due to the hydride or π-accepting CO group resulted in similar Ru1–N2(pyrazole) and Ru1–N4(azo) bond distances (Table 1). 24,25…”

Self-assembled nanovesicles based on chiral bis-H8-BINOL for Fe3+ recognition and secondary recognition of l-cysteine by 1 + 1 complex

“…27,28 According to research reports, triazole can be used as a corrosion inhibitor for organic copper 29,30 and is a very important metal complex. 31,32 1,2,3-Triazole has better affinity and easier coordination with metal ions. 33,34 In this paper, a 2-substituted 1,2,3-triazole-glucose derivative based on octahydronaphthol was synthesized by introducing glucose molecules via click reaction.…”

“…27,28 According to research reports, triazole can be used as a corrosion inhibitor for organic copper 29,30 and is a very important metal complex. 31,32 1,2,3-Triazole has better affinity and easier coordination with metal ions. 33,34…”

Organometallic Chemistry of the Difluorodithiophosphate Anion

“…[29] Low valent group 8 complexes such as RuH(η 2 -L)(CO)(PPh 3 ) 2 were L is an anionic bidentate ligand are attractive complexes when studying new classes of chelates: some advantages include simple synthesis, good solubility, inertness of the coordination sphere, resistance to oxidation, thermal stability, and good spectroscopic handles provided by the H À , CO and PPh 3 ligands. [30][31][32][33][34] The presence of bulky triphenylphosphine ligands aids in the recrystallization of the complexes as well as crystal growth for X-ray diffraction. Further reactivity, such as substitution of the hydride by chlorine with N-chlorosuccinimide or by hydride cleavage with strong acids can be easily achieved.…”