论文信息 - Synthesis and structural characterisation of the dianion [Co9(C2)(CO)19]2– as its tetramethylammonium salt

Synthesis and structural characterisation of the dianion [Co9(C2)(CO)19]2– as its tetramethylammonium salt

The dianion [Co9(C2)(CO)19]2– 1 ([NMe4]+ salt) has been obtained by pyrolysis of [NMe4][Co6C(CO)14] in diglyme (2,5,8-trioxanonane) at 130 °C, and, as the parent compound, is paramagnetic. The salt [NMe4]2[Co9(C2)(CO)19] has been characterised by single crystal X-ray diffraction. The Co9(C2) core of the anion can be described as a D3h tricapped trigonal prism of Co atoms with stretched interbasal edges encapsulating an acetylide C2 unit [C–C 1.39(2) A]. Nine CO ligands are linearly bonded, one per metal atom, six are edge bridging and four semibridging. The overall molecular symmetry is C2v or, more accurately, C2.

[1] N. Masciocchi,et al. SYNTHESIS AND CHEMICAL BEHAVIOUR OF THE CO6NI2C2(CO)162- CLUSTER. ELECTROGENERATION OF THE CO6NI2C2(CO)16N-(N=1,3,4) CLUSTER ANIONS. CRYSTAL AND MOLEC ULAR STRUCTURES OF NET42CO6NI2C2(CO)16 AND NET42CO6NI2C2(CO)14(CH3CN)2, , 1992 .

[2] N. Masciocchi,et al. Degradation reactions of nickel mono-carbide clusters: synthesis and crystal structure of the [Ni7(CO)12C]2−, [Ni11(CO)15C2]4− and [Ni12(CO)16C2]4− poly-anions , 1988 .

[3] M. Manassero,et al. SYNTHESIS AND CHEMICAL BEHAVIOR OF THE [CO3NI7(CO)16C2]2- AND [CO3NI7(CO)15C2]3- DICARBIDE CLUSTERS - X-RAY CRYSTAL-STRUCTURE OF [PPH4]2[CO3NI7(CO)16C2] , 1985 .

[4] D. Braga,et al. Carbide clusters in the cobalt subgroup , 1981 .

[5] P. Chini,et al. Stabilization of carbonyl clusters by a carbide atom. Synthesis and characterization of carbonoctadecacarbonyloctacobaltate(2-) and of paramagnetic carbontetradecacarbonylhexacobaltate(1-) anions , 1976 .

[6] G. Bor,et al. Kobaltcarbonylderivate des Tetrachlorkohlenstoffs und organischer 1.1.1‐Trihalogenverbindungen: Trikobalt‐enneacarbonyl‐kohlenstoff‐Verbindungen , 1962 .