کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1194899 | 1492357 | 2008 | 7 صفحه PDF | دانلود رایگان |
Infrared spectra of gas-phase metal-nitrate anions M(NO3)3−, where M = Mg2+, Ca2+, Sr2+ and Ba2+, were recorded by infrared multiple-photon dissociation (IRMPD) spectroscopy. Photodissociation of each of the precursors produces NO3− through the elimination of a neutral M(NO3)2 unit. An absorption pattern characteristic of metal nitrates is observed in the IRMPD spectra, including the symmetric and antisymmetric NO3 stretches. The latter is split into high-and low-frequency components as a result of perturbation of the nitrate symmetry by complexation to the metal ion, and the magnitude of the splitting decreases following the trend Mg2+ > Ca2+ > Sr2+ ≅ Ba2+. The experimental spectra are in good general agreement with those obtained from density functional theory (DFT) calculations.
Journal: International Journal of Mass Spectrometry - Volume 273, Issues 1–2, 1 June 2008, Pages 24–30