Abstract
A structural study based on EXAFS, FTIR, and optical absorption spectroscopies has been conducted on a photogenerated, metastable state of cyclopentadienylnitrosylnickel (CpNiNO) produced by a reversible photochemical reaction. The photogenerated, metastable state with distinctively different EXAFS, FTIR, and optical absorption spectra from those of the ground state was created by irradiating the sample at 20 K with the 365-nm line of a mercury lamp. On the basis of the analysis of the EXAFS data, the photogenerated, metastable state of CpNiNO has undergone considerable nuclear rearrangements compared to its ground state. The nuclear movement is characterized by a 0.12-angstrom elongation of the Ni-N bond and by a bending of the Ni-N-O. A shift of the N-O stretching frequency from 1824 to 1387n cm[sup [minus]1] was observed in the photoinduced reaction with 365-nm light, consistent with previous studies. 15 refs., 10 figs., 1 tab.
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