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HN 2 O 2 − as a Ligand in Mononuclear Hydrogenhyponitrite‐κ 2 ‐ N , O Ruthenium Complexes with Bisphosphane Co‐Ligands
Author(s) -
Beck Daniel,
Klüfers Peter
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201803770
Subject(s) - deprotonation , chemistry , ligand (biochemistry) , denticity , ruthenium , protonation , imidazole , medicinal chemistry , stereochemistry , crystallography , catalysis , ion , crystal structure , organic chemistry , receptor , biochemistry
The hyponitrite anion is a tentative intermediate in the reduction of nitric oxide (NO) to nitrous oxide (N 2 O) catalyzed by nitric‐oxide reductase (NOR) in the process of bacterial denitrification. Owing to the considerable number of known coordination modes for the hyponitrito ligand, its actual bonding form in the enzymatic cycle is a point of current discussion. Here, we contribute to the hardly known ligand properties of a key intermediate, the monoprotonated hyponitrite anion. Three air‐ and water‐stable ruthenium complexes with hydrogenhyponitrite as the ligand were synthesized by using commercially available bisphosphane co‐ligands (1,2‐bis(diphenylphosphino)ethane (dppe), 1,3‐bis(diphenylphosphino)propane (dppp), 1,2‐bis(diphenylphosphino)ethene (dppv)). The starting compounds [Ru(dppe) 2 (tos)]BF 4 ( 1 ) and [Ru(dppp) 2 (tos)]BF 4 ( 2 ) contained the bidentate coordinating tosylate anion (tos) as a particularly well‐suited leaving group. To confirm the protonated and deprotonated species, X‐ray diffraction, IR, UV/Vis spectroscopy (solution and solid state), solid‐state NMR spectroscopy, and high‐resolution mass spectroscopy were used. DFT calculations give insight into the bonding situation. We report on [Ru(dppe) 2 (HN 2 O 2 )]BF 4 ( 5 ), [Ru(dppp) 2 (HN 2 O 2 )]BF 4 ( 6 ), [Ru(dppv) 2 (HN 2 O 2 )]BF 4 ( 7 ), [Ru(dppp) 2 (HN 2 O 2 )]BF 4 ⋅ Imi ( 9 ; Imi=imidazole) as the first mononuclear trans ‐hydrogenhyponitrite complexes. Isolated deprotonated analogs are [Ru(dppe) 2 (N 2 O 2 )] ⋅ HImi(BF 4 ) ( 8 ) and [Ru(dppv) 2 (N 2 O 2 )] ⋅ HImi(BF 4 ) ⋅ Imi ( 10 ).