期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 131, 期 8, 页码 2977-2985出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja808524y
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资金
- Deutsche Forschungsgemeinschaft (DFG, Bonn/Germany)
- Schweizer National-Fonds [200021-113479]
- Fonds der Chemischen Industrie (Frankfurt/Main, Germany)
The reaction of bromo-2,4,6-triphenylbenzene with activated magnesium in THF yielded the Grignard reagent [(thf)(2)Mg(Br)-C6H2-2,4,6-Ph-3] (1) with a Mg-C bond length of 214.8(3) pm. A similar reaction of bromo-2,4,6-triphenylbenzene with activated calcium led to an inverse sandwich complex [(thf)(3)Ca{mu-C6H3-1,3,5-Ph-3}Ca(thf)(3)] (2) with the calcium atoms on opposite sides of the central arene ring showing small Ca-Ca' and Ca-C distances of 427.9(3) and 259.2(3) pm. This extremely air- and moisture-sensitive complex exhibits thermochomic and solvatochromic behavior. It is paramagnetic with spin of S = 1 (triplet) with an ESR resonance at g = 2.0023. Quantum chemical calculations shed light on the bonding situation in this very unusual dinuclear Ca(I) compound.
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