Photoinduced behaviour of N,N-bidentate manganese(I) and rhenium(I) tricarbonyl complexes for singlet oxygen generation and CO release.

The combined action of singlet oxygen (O) and photoinduced carbon monoxide (CO) released by tricarbonyl metal complexes is a promising synergic treatment against multi-resistant bacterial infections. In this work, we explore the use of a polydentate ligand (bpm = 2,2-bipyrimidine) that offers the opportunity to accommodate two metal centers exhibiting both singlet oxygen generation and carbon monoxide releasing properties in a single molecule. A series of monometallic ([(bpm)M(CO)Br]; M = Mn, Re) and homo or hetero bimetallic ([Br(CO)M(bpm)M'(CO)Br]; M = Mn, Re) compounds were synthesized in moderate to good yields by modulating the metal precursor or the stoichiometry, also the syn:anti isomers ratio for the bimetallic complexes was dependent on the experimental conditions used.

Crystal structures and Hirshfeld surface analysis of [κ-,-{(CH)(CHN)P}Re(CO)Br]·2CHCl and the product of its reaction with piperidine, [-{(CH)(CHN)P}(CHN)Re(CO)Br].

The coordination of the ligands with respect to the central atom in the complex bromido-tricarbon-yl[diphen-yl(pyridin-2-yl)phosphane-κ ,]rhenium(I) chloro-form disolvate, [ReBr(CHNP)(CO)]·2CHCl or [κ-,-{(CH)(CHN)P}Re(CO)Br]·2CHCl, (·2CHCl), is best described as a distorted octa-hedron with three carbonyls in a facial conformation, a bromide atom, and a biting ,-di-phenyl-pyridyl-phosphine ligand. Hirshfeld surface analysis shows that C-Cl⋯H inter-actions contribute 26%, the distance of these inter-actions are between 2.895 and 3.