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Syntheses and crystal structures of 1,2:5,6:9,10:13,14:17,18:21,22-hexabenzo-3,7,11,15,19,23-hexadehydro[24]annulene (HBC), 1,2:5,6:9,10:13,14-tetrabenzo-3,7,11,15-tetradehydro[16]annulene (QBC) and a tetracobalt complex of QBC. The first example of a transition metal complex of QBC |
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| Authors: | Don Solooki John D Bradshaw Claire A Tessier Wiley J YoungsRonald F See Melvyn ChurchillJoseph D Ferrara |
| Institution: | Department of Chemistry, The University of Akron, Akron, OH 44325-3601 USA Department of Chemistry, SUNY at Buffalo, Buffalo, NY 14214 USA Molecular Structure Corporation, The Woodlands, TX 77381-4238 USA |
| Abstract: | 1,2:5,6:9,10:13,14-Tetrabenzo-3,7,11,15-tetradehydro16]annulene, or tetrabenzocyclyne (QBC) and 1,2:5,6:9,10:13,14:17,18:21,22-hexabenzo-3,7,11,15,19,23-hexadehydro24]annulene (HBC) have been structurally characterized by X-ray. crystallography. QBC crystallizes in two different space groups; P21/c with a = 10.652(3) Å, b = 10.624(2) Å, c = 19.549(4) Å, β = 93.83(2)°, V = 2207.4(8) Å3, and Z = 4 and P41212 with a = 9.330(1) Å, c = 25.497(8) Å, V = 2219.6(12) Å, and Z = 4. HBC crystallizes in monoclinic P21/n with a = 14.763(3) Å, b = 10.296(2) Å, c = 22.057(4) Å, β = 108.61(3), V = 3177.4(11) Å3, T = 133 K, and Z = 4. Reaction of QBC with dicobaltoctacarbonyl has produced a tetracobalt complex which has been characterized by X-ray crystallography. This complex crystallizes in monoclinic P21/c with a = 14.699(3) Å, b = 17.188(3) Å, c = 17.254(3) Å, β = 112.63(3)°, V = 4023.5(13) Å3, and Z = 4. Only two of the four C---C triple bonds of QBC bind to dicobalthexacarbonyl moieties even when excess dicobaltoctacarbonyl is used. |
| Keywords: | Cobalt Annulene Cyclyne Hexabenzocyclohexyne Tetrabenzocyclo tetrayne Tribenzocyclotriyne Crystal structure |
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