Tsuyoshi Kurikawa

MULTIPLE DUMBBELL STRUCTURES OF VANADIUM-C60 CLUSTERS

Vanadium (V)–C60 mixed clusters were produced by two laser vaporization methods. In the mass spectra of cationic Vn(C60)m+, the abundant clusters were produced at the composition of (n,m)=(1,1), (1,2), (2,3), (3–4,4), and (5,5). This pattern is explicable in terms of a multiple dumbbell structure; V atom and C60 are alternatively piled up. The ionization energy and the reactivity of the dumbbell clusters toward O2 and CO show V1(C60)2 takes a structure of V1(η6−C60)2.

Charge distributions in multiple-decker sandwich clusters of lanthanide–cyclooctatetraene: Application of Na-atom doping

Abstract In gas phase, Na-atom adducts were produced for organometallic lanthanide complexes of Ln n (C 8 H 8 ) n +1 [Ln=europium (Eu) and holmium (Ho); C 8 H 8 =1,3,5,7-cyclooctatetraene (COT)] by a combination of two-laser vaporization and a molecular beam method. The number of attached Na atoms can be reasonably explained by charge distributions of the complex, where Eu and Ho atoms exist as Eu 2+ and Ho 3+ , respectively, and C 8 H 8 molecules as COT 2− , accepting two excess electrons. The behavior of the Na adducts chemically demonstrates that the organometallic lanthanide complex is formed through ionic bonding, implying that it is possible to be isolated as its Na salt.

Photoionization electronic spectroscopy of AlNa

Abstract Two electronic transitions are observed for a new heteronuclear dimer, AlNa, using two-color two-photon ionization spectrocopy (2R2PI). The combination of the analysis of vibronic structure and ab initio calculation enables us to assign the two transitions as D 1 Π←X 1 Σ + and C 1 Σ + ←X 1 Σ + ; the origins of the D and C states are located at 16427 and 15422 cm −1 , and the vibrational frequencies being 151 cm −1 in the D state, 115 cm −1 in the C state, and 186 cm −1 in the X state, respectively.

STRUCTURES OF ORGANOMETALLIC CLUSTERS: Vn(BENZENE)m AND Con(BENZENE)m

Metal-molecule clusters, Vn(benzene)m, Con(benzene)m, and their ions, were synthesized by the reaction of laser-vaporized vanadium atoms with benzene vapor. Both neutral and cationic Vn(benzene)m clusters exhibit magic number behavior at m = n + 1(n = 1–5), which was explicable in terms of multiple-decker sandwich structure.