ABSTRACT
Ion chromatography studies were performed to assess various models proposed for the structure of M(8)C(12) species, the met-cars. A laser desorption source was used to make a sequence of titanium-carbon clusters centered around Ti(8)C(12)(+). The Ti(8)C(12)(+) was determined to be a hollow cage cluster, with the dodechadron structure originally propposed termined to be a hollow cage cluster, with the dodecahedron structure originally proposed giving the best fit to experiment; cubic structures could be excluded. Collisional breakup of Ti(8)C(12)(+) yielded only Ti(7)C(12)(+) under the experimental conditions described herein, and modeling indicated that the cage structure was retained. Both Ti(8)C(11)(+) and Ti(8)C(13)(+) were made by the cluster source, and again, dodecahedral-type cage structures were consistent with experiment. The extra carbon atom in Ti(8)C(13)(+) was attached exohedrally to a single titanium atom. No evidence for an endohedral species was found.
ABSTRACT
The structure of small carbon cluster anions, Cn(-) (4 = n = 20), was investigated with the use of ion chromatography. With this technique, both the existence and the relative amounts of possible structural isomers can be determined. More than 99% of the ions C(5)(-) to C(9)(-) were found to be linear under these experimental conditions. Starting with C(10)(-), a monocyclic isomer was observed, and linear and moncyclic structures coexisted from C(10)(-) through at least C(20)(-). This result is in contrast to previous work on positive ions, which showed the existence of linear isomers from C(5)(+) to C(10)(+), with linear and cyclic isomers coexisting only from C(7)(+) to C(10)(+). Above C(10)(+), no linear clusters were observed.