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Laser desorption/ionization Fourier transform ion cyclotron resonance mass spectometry of [Nb_6X_12)X_2(H_2O)_4].4H_2O, X=Cl or Br

Tetraaquadodeca-mi-halodihalohexaniobium tetrahydrates [Nb_6X_12)X_2(H_2O)_4].4H_2O, X=Cl or Br, were studied using laser desorption/ionization (LDI) Fourier transform ion cyclotron resonance mass spectrometry. Only negative ions were found to form in the gas phase under LDI conditions. The quasimolecular ion, M^-= [Nb_6X_12)X_2]^- and the fragment ions, [M-X_n]^-, n=1-3, are the highest abundance ions in the LDI mass spectra, indicating the stability of the core cluster, (Nb_6X_12). Clusters with chlorine atoms as ligands show relatively high affinity for an additional chlorine atom, while clusters with bromine atoms as ligands prefer to lose a bromine atom. The results are compared with those of mass spectra of analogous tantalum clusters.

niobium cluster ; mass spectrum LDI

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