Synthesis and structures of cationic bis(arene) rhenium complexesстатья
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Аннотация:Heating of KReO4 with benzene or its derivatives in the presence of AlCl3 and Zn gives cationic bis(arene) rhenium complexes [Re(n(6)-arene)(2)](+) (arene - benzene (1a), toluene (1b), o-xylene (1c), p-xylene (1d), mesitylene (1e)) in 30-40% yield. Similar reaction with naphthalene affords [Re(n(6)-naphthalene)(2)](vertical bar) (2) in 5% yield. The naphthalene complex 2 undergoes replacement of both ligands by (BuNC)-Bu-t at 80 degrees C giving the cation [Re(tBuNC) 6](+) while the benzene complex 1a does not react under these conditions. The energy decomposition analysis revealed that metal-arene bond in the cation 1a is stronger than in the neutral W(C6H6)(2) but weaker than in the dication [Os(C6H6) 2](2+). The structures of [1a] BF4 and [1e] BF4 were determined by X-ray diffraction. (C) 2013 Elsevier B.V. All rights reserved.