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Oxygen Activation by Copper Complexes with an Aromatic Bis(guanidine) Ligand
Author(s) -
Strassl Florian,
GrimmLebsanft Benjamin,
Rukser Dieter,
Biebl Florian,
Biednov Mykola,
Brett Calvin,
Timmermann Riccardo,
Metz Fabian,
Hoffmann Alexander,
Rübhausen Michael,
HerresPawlis Sonja
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201700528
Subject(s) - chemistry , guanidine , copper , ligand (biochemistry) , photochemistry , natural bond orbital , raman spectroscopy , inorganic chemistry , molecule , organic chemistry , biochemistry , receptor , physics , optics
Combining the new aromatic bis(guanidine) ligand bis(tetramethylguanidino)toluene (TMG 2 tol) and different copper salts led to four new complexes. The molecular structures were analysed by X‐ray diffraction. Three of the complexes are active in biomimetic activation of oxygen. It is the first time a bis‐µ‐oxido species of an aromatic guanidine copper complex is analysed by Raman and UV/Vis spectroscopy. The formation and decay of the bis(µ‐oxido)dicopper species were investigated at low temperatures up to 273 K by UV/Vis spectroscopy with a stopped‐flow setup. The results showed that the Cu 2 O 2 intermediate of an aromatic guanidine–copper complex decays much faster than most known bis(guanidine) complexes. Moreover, natural bond orbital (NBO) analyses revealed that the aromatic guanidine is the stronger donor compared to the aliphatic one.