The reactivity of the [Re≡O]3+ core toward aromatic 1,2-diamines: the formation of rhenium(V)-imido complexes

The reaction of [ReIIICl3(t-BuNC)(PPh3)2] with aniline derivatives: Isolation of imido-Re(V) complexes and a Re(III) complex containing iminobenzoquinonate as ligand

“…Focussing on Re(V) complexes, the reaction of trans-[ReOCl 3 (PPh 3 ) 2 ] with H 2 an and H 2 db (H 2 L) led to the formation of [Re V (L)Cl 3 (PPh 3 ) 2 ], in which the ligands L 2À are coordinated as monodentate imides [30,31]. With H 2 ap the complex [ReOCl 2 (Hap)(PPh 3 )] was isolated, with the bidentate coordination of Hap À via the acetato oxygen and neutral amino nitrogen [32,33].…”

Novel p-tolylimido rhenium(V) complexes incorporating quinoline-2-carboxylate ion – Synthesis, X-ray studies, spectroscopic characterization and DFT calculations

“…Similar to the related imido complexes it is extremely difficult to identify the Re-NC 6 H 4 CH 3 stretches in the IR spectra of 1a, 1b, 2a and 2b, as they may be mixed with m C@N and m P-C modes of PPh 3 and quin-2-COO À ligands [29][30][31][32][33][34][35][36]. The experimental vibrational spectra of 1a and 1b are compared to the calculated (non-scaled) ones ( Figs.…”

“…only some C-HÁÁÁX, C-HÁÁÁO and C-HÁÁÁN of small importance weak inter-and intra-molecular hydrogen bonds exist [37,38]. The molecular structures of 1a and 1b are presented in Figs [29][30][31][32][33][34][35][36]. The interatomic distance between the rhenium atom and the oxygen atom of quin-2-COO À ligand is almost equal to an ideal single Re-O bond length (ca.…”

Monodentate imido and bidentate aminophenolate coordination of 2-aminophenol in rhenium(V) complexes

“…We have studied for some time the reactivity of monooxo and dioxorhenium(V) cores with the aromatic diamine 1,2-diaminobenzene and its derivatives. We have shown that diaminobenzene coordinates in a variety of different forms to rhenium, as a bidentate diamide [2,3], bidentate aminoamide [4], bidentate semibenzoquinone diimine [5] and as a monodentate imide [6]. We have since extended this project to 2-aminophenol (H 2 ap) and its derivatives.…”

“…We have since extended this project to 2-aminophenol (H 2 ap) and its derivatives. For example, the potentially ambidentate 2,3-diaminophenol (H 2 dap) coordinates to rhenium(V) only via a doubly deprotonated amino nitrogen, as an imide, in [Re(dap)Cl 3 (PPh 3 ) 2 ] [6].…”