Synthesis and Characterization of Molybdenum Carbide Clusters MonC4n, (n = 1 to 4).
Laser radiation (XeCl laser, 308-nanometer wavelength) focused into a cell containing Mo(CO)(6) vapor produced ultrafine particles in the extended waist of the laser beam. Negative ion mass spectrometry revealed molybdenum carbide cluster ions with a stoichiometry MonC4n (n = 1 to 4). The MonC4n(-) (n = 2 to 4) ions are completely unreactive with NH(3), H(2)O, and O(2), suggesting structures in which the molybdenum atoms are unavailable for coordination to additional ligands. Collision-induced dissociation studies of these anions show the loss of MoC(4) units as the main fragmentation pathway. This observation, together with the lack of addition reactions, provides a basis for structures in which a planar cluster of two, three, or four molybdenum atoms is surrounded by, and bonded to, carbon dimers.
Jin
C
C
Haufler
R E
RE
Hettich
R L
RL
Barshick
C M
CM
Compton
R N
RN
Puretzky
A A
AA
Dem'yanenko
A V
AV
Tuinman
A A
AA