Tc. Smith et al., The electronic spectrum of germanium methylidyne (GeCH), the prototypical organogermanium compound, J CHEM PHYS, 112(19), 2000, pp. 8417-8425
The (A) over tilde (2)Sigma(+)-(X) over tilde (2)Pi(i) electronic transitio
n of jet-cooled germanium methylidyne has been recorded in the 730-555 nm r
egion by laser-induced fluorescence techniques. The radical was produced in
a pulsed electric discharge using tetramethylgermane as the precursor. The
band system consists of perpendicular and vibronically induced parallel ba
nds with upper state frequencies of nu(2)'=638/497 cm(-1) and nu(3)'=990/95
2 cm(-1) for GeCH/GeCD. The (2)Sigma(+)-(2)Pi(3/2) components of the 0(0)(0
) bands of GeCH and GeCD and the 2(0)(1) band of GeCH have been recorded wi
th sufficient resolution to assign the transitions of the Ge-70, Ge-72, Ge-
74, and Ge-76 isotopomers. The rotational constants of the various hydrogen
and germanium isotopomers were used to derive the following molecular stru
ctures: r(0)"(Ge-C)=1.775 79(21) Angstrom, r(0)"(C-H)=1.0673(12) Angstrom,
r(0)'(Ge- C)=1.673 66(8) Angstrom, and r(0)'(C-H)=1.0589(5) Angstrom. The g
round state germanium-carbon bond length is typical for a Ge=C double bond,
but in the excited state it corresponds to a triple bond. This is a conseq
uence of promotion of an electron from a nonbonding sigma orbital to a pi b
onding orbital to form the ...sigma(1)pi(4)((2)Sigma(+)) excited state. In
this study we provide the first experimental value for the length of the ge
rmanium-carbon triple bond. (C) 2000 American Institute of Physics. [S0021-
9606(00)01619-6].