The crystal structures of tetra-kis-(μ-n-butyrato-κ(2) O:O')bis[bromidorhenium(III)] and tetra-kis-(μ-n-butyrato-κ(2) O:O')bis[chlorido-rhenium(III)] aceto-nitrile disolvate

Carly R Reed; William W Brennessel

doi:10.1107/S2056989015020563

The crystal structures of tetra-kis-(μ-n-butyrato-κ(2) O:O')bis[bromidorhenium(III)] and tetra-kis-(μ-n-butyrato-κ(2) O:O')bis[chlorido-rhenium(III)] aceto-nitrile disolvate

Acta Crystallogr E Crystallogr Commun. 2015 Nov 7;71(Pt 12):1480-4. doi: 10.1107/S2056989015020563. eCollection 2015 Dec 1.

Authors

Carly R Reed¹, William W Brennessel²

Affiliations

¹ Department of Chemistry and Biochemistry, The College at Brockport, SUNY, Brockport, NY 14420, USA.
² Department of Chemistry, University of Rochester, Rochester, NY 14627, USA.

Abstract

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.

Keywords: crystal structure; dihalidotetrakis(butyrato)dirhenium(III,III); dirhenium tetracarboxylate; paddlewheel complex; quadruple bond.