Tg. Spence et al., LIGAND-FIELD PHOTOCHEMISTRY OF THE [CU-II(BPY)(SERINE-H)](-DOT) COMPLEX IN THE GAS-PHASE(CENTER), International journal of mass spectrometry and ion processes, 177(2-3), 1998, pp. 187-196
Citations number
31
Categorie Soggetti
Spectroscopy,"Physics, Atomic, Molecular & Chemical
Photochemistry resulting from excitation of a d-d transition at 575 nm
between ligand-field states in the gas-phase [Cu-II(bpy)(serine-H)](.) complex generated by electrospray ionization is reported. These res
ults are discussed in terms of a reaction scheme proposed by Turecek a
nd co-workers [C.L. Gatlin, F, Turecek, T. Vaisar, J. Mass Spectrom. 3
0 (1995) 1617] for collisionally activated dissociation of this comple
x at low center-of-mass collision energies under multiple-collision co
nditions. Three photofragment ions are observed, corresponding to elim
ination of formaldehyde, stepwise loss of formaldehyde followed by (OC
)-O-.(OH)CHNH2, and transfer of a hydroxyl group to the Cu-II ion acco
mpanied by loss of H2CCHNH2CO2. A fourth fragmentation channel reporte
d by Turecek and co-workers corresponding to decarboxylation and assoc
iated dehydration is also observed at moderate center-of-mass collisio
n energies under single-collision conditions but is absent in the lase
r photofragmentation difference mass spectrum resulting from excitatio
n of [Cu-II(bpy)(serine-H)](+.) at 575 nm. (Int J Mass Spectrom 177 (1
998) 187-196) (C) 1998 Elsevier Science B.V.