Mass spectrometry, main group-transition

Exercise 1.3. Consider a coordination compound formed from BH3 and C2H4. From the HOMO-LUMO properties of each species predict the geometric structure of the Lewis acid-base adduct. Now predict the structure of a compound formed by replacing one CO ligand of Fe(CO)5 with C2H4. Note the parallelism between the main group and transition metal examples. The second compound is a stable and isolatable compound, whereas the first is a transient intermediate in the hydro-boration of ethylene to ethyl borane and has only been characterized as a transient intermediate in a fast-flow system by modulated mass spectrometry. 

Inorganic Chemistry of the Main-Group Elements IrKMganic Chemistry of the Transition Elements Inorganic Reaction Mechanisms Macromolacular Chemistry Mass Spectrometry Molecular Spectroscopy Molecular Structure by Diffraction Methods. 4 Nuclear Magnetic Resonance... 

The so-called superbenzene, coronene, was used as a substrate by Pozniak and Dunbar (1997) in an FTICR-MS study of the formation kinetics of monomer and dimer association complexes with Sc and Y, together with several other main-group and transition metal cations. The formation of coronene adducts was also observed for RO" " and R(OH)2 ions, for both Sc and Y, with rates similar to the attachment rates for the corresponding bare metal ions the same ions were produced by the reaction of R(coronene) with background oxygen/water. In a different approach, Duncan and coworkers used covaporization of Nd oxide and pyrene in a laser plasma source with time-of-flight mass spectrometry (TOF-MS) detection to produce NdO(pyrene) " ions, with =1, 2 (Ayers et al., 2004). 

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