Bent vs. linear nitrosyl paradox. Infrared and x-ray photoelectron spectra of dichloronitrosylbis(L)cobalt(II) and crystal structure with L = diphenylmethylphosphine

Bent and Linear {CoNO}8 Entities: Structure and Bonding in a Prototypic Class of Nitrosyls

“…Evolution of the Current Knowledge of Structure and Bonding in {CoNO} 8 Coordination Entities. MNO units often share their linear shape with the related carbonyl and cyanido complexes.…”

“…Inversely, a nonlinear MNO groupnonlinearity is not a usual attribute of carbonyl and cyanido binding in mononuclear complexes seems to be accepted as a commensurate condition of a negative charge of the nitrosyl ligand. The deduction of a bonding situation from the structure is particularly well established for the case of bent singlet {CoNO} 8 units. (The superscript denotes the number of d electrons of the central metal if NO + is assumed: the Enemark−Feltham notation.)…”

The reaction of rhenium nitrosyl with a sterically hindered NHC-carbene

“…It is possible as well to have a dinitrosyl complex with both linear and bent coordinated NO groups present at the same time. [39][40][41][42] Considering the existing literature, we believe that the complex mer-[(OPPh 3 )Re(NO) 2 Cl 3 ] probably possesses an internal fluxional process that is responsible for the reactivity of its NOs and for all the signals present in the 15 N NMR (ESI, S9 ‡). We excluded the presence of signals belonging to paramagnetic species in the 15 N NMR that we have run, since the number of scans (less than 3000) and the condition used (T 1 > 30 s) for the NMR analysis would not have allowed us to observe such complexes.…”

Mixed ligand complexes of FeIII containing pseudohalides, nitrosyl and some mannich bases

“…All the complexes show an absorption band in the region 1636-1685 cm )1 which can be assigned to t(N=O) stretching vibrations indicating that the nitrosyl group is linearly bonded to the metal ion [24][25][26][27][28].…”