4575-44-4Relevant academic research and scientific papers
Rhenium complexes of di-2-pyridyl ketone, 2-benzoylpyridine and 2-hydroxybenzophenone: A structural and theoretical study
Yumata,Habarurema,Mukiza,Gerber,Hosten,Taherkhani,Nahali
, p. 89 - 103 (2013/10/22)
The reactions of di-2-pyridyl ketone (dpk), 2-benzoylpyridine (zpy) and 2-hydroxybenzophenone (Hbp) with [Re(CO)5Cl] (A) and trans-[ReOX 3(PPh3)2] (B, X = Cl, Br) were studied. The complexfac-[Re(CO)3 (dpk·OCH3)] was isolated from the reaction of A with dpk in methanol. The monoanionic tridentate chelate dpk·OCH3 was formed by the nucleophilic attack of methanol at the carbonylic carbon atom of dpk. A similar attack of water on dpk was observed in the compound cis-[ReOBr2(dpk·OH)]·2(dpkH +Br), which was formed from dpk and [ReOBr3(PPh 3)2] in acetone. The reaction of zpy with B in acetonitrile produced the complexes [ReIIIX3(zpy)(PPh 3)], but in methanol as solvent the compounds [ReOX 2(zpyH)(PPh3)] were isolated, where zpyH coordinates bidentately as the monoanionic ligand [C6H5(HC-O)C 5H4N]. With A as starting material the complexfac-[Re(CO)3(zpy)Cl] was isolated. The complexes cis-[ReOX2(bp)(PPh3)] were the products of the reaction of Hbp with B in acetonitrile; however, in methanol cis-[ReIIIBr 2 (bp)(PPh3)2] was isolated. All these complexes were characterized by conductance measurements, elemental analyses, UV-Vis, IR and NMR spectroscopy and by single crystal X-ray diffraction. DFT calculations regarding the electronic ground states show single states for all the complexes, except for the rhe-nium(III) complexes [ReIIIX 3(zpy)(PPh3)] and [ReBr2(bp)(PPh 3)2], in which the states are triplet. The DFT and experimental results are in agreement in all cases, especially the anisotropy of the Re-N bond length offac-[Re(CO)3(dpk·OCH3)] and exact O(1)-Re-O(3) angles for [ReOX2(bp)(PPh3)].
