Dimeric rhenium(IV) and monomeric rhenium(I) and (V) complexes of orotic acid

• DOI: 10.1016/j.poly.2015.06.006
• Publication Date: 2015-06-14T09:56:21Z
• Authors: J. Mukiza; E.C. Hosten; T.I.A. Gerber
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract The reaction of orotic acid (H 2 or) with trans -[ReOBr 3 (PPh 3 ) 2 ] in ethanol produced the triply-bridged dimer ( μ -Br)( μ -O)( μ -or)[Re IV 2 Br(OEt) 2 (PPh 3 ) 2 ] ( 1 ). In 2-propanol as solvent the product ( μ -Br)( μ -O)( μ -or)[Re IV 2 Br 2 (OPr i )(PPh 3 ) 2 ] ( 2 ) was isolated. In order to eliminate the oxo group as a bridging ligand, the imido-coordinated [Re V {=NC 6 H 4 (2-NH 2 )}Br 3 (PPh 3 ) 2 ] was reacted with H 2 or to give the monomer [Re{NC 6 H 4 (NH 2 )}Br(or)(PPh 3 ) 2 ] ( 3 ) as product. To remove PPh 3 as possible ligand, the reaction of [ReO 2 (py) 4 ]Cl with H 2 or produced [ReO(OEt)(or)(py) 2 ] ( 4 ). H 2 or was also reacted with [Re(CO) 5 Cl], yielding the product (Ph 4 P)[Re(CO) 3 (H 2 O)(or)] ( 5 ). The crystal structures of 1 – 5 were determined by X-ray single crystal diffraction. In addition, infra-red, 1 H NMR, electrochemical and electronic properties are also reported.