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Plasma desorption mass spectrometry of transition metal complexes of thio- and selenosemicarbazones of 2-acetylpyridines |
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| Authors: | Lewis K. Panell Henry M. Fales John P. Scovill Daniel L. Klayman Douglas X. West Ramon L. Tate |
| Affiliation: | (1) Laboratory of Chemistry, National Heart, Lung, and Blood Institute, National Institutes of Health, 20205 Bethesda, MD, USA;(2) Division of Experimental Therapeutics, Walter Reed Army Institute of Research, 20307 Washington, DC, USA;(3) Department of Chemistry, Illinois State University, 61761 Normal, IL, USA;(4) DCRT, Computer Systems Laboratory, National Institutes of Health, 20205 Bethesda, MD, USA;(5) Present address: Chemistry Division, DSIR, Christchurch, New Zealand |
| Abstract: | Summary Californium-252 plasma desorption mass spectra were recorded for complexes of the anions of various thio-and seleno-semicarbazones of 3-acetylpyridines(1–4) with the transition metal ions iron(III) and cobalt(II). Positive ion spectra gave clear evidence of the cation present and fragmentation with loss of ligands or parts of ligands was straightforward. Negative ion spectra likewise provided evidence of the intact anion except with tetracoordinate metal halide systems [MX4]– which lost one or more halide atoms. Evidence of fragmentation of the ligand and recombination of the fragments with the metal ion was also observed in the negative ion mode. Spectra were used to revise the structure of a complex previously reported as [FeLCl2](1) to [FeL2]+[FeCl4]–. |
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