The gas-phase clustering reactions X~(C6F6),h + C6F6 = X~(C6F6)" for X = F, Cl, Br, and I are studied by using the pulsed electron-beam high-pressure mass spectrometer. Contrary to the covalent bond formation in the cluster F"-C6F6, the bonds of X~-C6F6 for X = Cl, Br, and I are largely electrostatic. Ab initio MO calculation reveals that X" in the cluster X~-C6F6, X = Cl, Br, and I, is located along the Q principal axis of C6F6 to form the C6ii symmetry.
Stability of doubly charged alkali halide clustersThermodynamic data, I::JI~ _ l,n and ~~ I,n' for clustering reactions of halide ions with CO 2were measured with a pulsed electron-beam high-pressure mass spectrometer. The large value of -I::JIg,l (32.3 kcal/mol) and a sudden decrease of -1::JI?,z (7.3 kcal/mol) for reaction P-(C0 2 )n I + CO 2 = P-(C0 2 )n indicate the formation ofthe core ion, not P-'C0 2 , but FC0 2 -, i.e., PCOi is the fluoroformate ion, The measured binding energies -I::JI ~ I, .. for the clusters P-(C0 2 )" were reproduced satisfactorily by the ab initio MO calculations. The FCOi ion is attacked successively and electrostatically by five CO 2 molecules to form the first solvation shell. The two oxygen atoms in the core ion PC0 2 -are able to accept four CO 2 molecules as ligands. The bonding of CI -, Br-, and I -to CO 2 is found to be mainly electrostatic.
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