Knowledge Bank

The complexes of Sc(C$6$H$6$) (n =1, 2; m =1-3, n$\le m$) and Sc(C$\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}$H$\mathrm{<mrow\; data-mjx-texclass="ORD">10</mrow>}$) were synthesized in a laser-vaporization metal cluster beam source. The C-H stretching frequencies of these complexes were measured with IR-UV resonant two-photon ionization spectroscopy. The experimental C-H stretching frequencies were compared with those of the free ligands and with the B3LYP/6-311+G(d,p) calculations. From these comparisons, the ground electronic states were determined to be $4$A$1$ (C) for the half-sandwich Sc(C$6$H$6$), $2$B(D) for the sandwich Sc(C$6$H$6$)$2$ , $1$A(D$2$) for the double sandwich Sc$2$(C$6$H$6$)$3$ and $2$B$1$(C) for the clamshell Sc(C$\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}$H$\mathrm{<mrow\; data-mjx-texclass="ORD">10</mrow>}$). The conclusions from this work are in consistent with the previous ZEKE spectroscopic studies.}$,$}