The crystal structures of tetrakis(μ-n-butyrato-κ2 O:O′)bis[bromidorhenium(III)] and tetrakis(μ-n-butyrato-κ2 O:O′)bis[chloridorhenium(III)] acetonitrile disolvate
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چکیده
The title complexes, [Re2Br2(O2CC3H7)4], (1), and [Re2(O2CC3H7)4Cl2]·2CH3CN, (2), both exhibit paddlewheel structures with four carboxyl-ate ligands bridging two Re(III) atoms. The Re-Re distances are 2.2325 (2) and 2.2299 (3) Å, indicating quadruple bonds between the Re(III) atoms in each complex. Both complexes contain an inversion center at the mid-point of the Re-Re bond. The Re-Br bond [2.6712 (3) Å] in (1) is 0.1656 (6) Å longer than the Re-Cl distance [2.5056 (5) Å] of (2). In (2), the N atom of each co-crystallized aceto-nitrile solvent mol-ecule is nearly equidistant between and in close contact with two carboxyl-ate C atoms.
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Crystal structure of tetrakis(μ-n-butyrato-κ2 O:O′)bis[chloridorhenium(III)](Re—Re)
With an inversion center at the mid-point of the two Re(III) atoms, the title compound, [Re2Cl2{O2C(CH2)2CH3}4], exhibits a paddle-wheel or lantern-type structure with four n-butyrate groups bridging two Re(III) atoms in a syn-syn fashion. The axial chloride ligands together with the Re-Re quadruple bond [2.2330 (3) Å] complete an essentially octa-hedral geometry around each Re(III) atom. There...
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