Products of reactions between ReX3 (X = Cl, I) and N-heterocyclic compounds – Structural and spectroscopic studies

•We investigated reactivity of ReCl3 and ReI3 in excess of N-heterocyclic compounds.•Two kinds of complexes rhenium(III) and rhenium(V) were synthesized.•Single crystal X-ray diffraction and spectroscopic studies were performed.

Investigations of products of reactions of rhenium(III) chloride and rhenium(III) iodide with N-heterocyclic compounds were carried out, which revealed the formation of two sorts of complexes: (I) [Re3Cl6(μ-Cl)3L3] {L = pyridine (py), pyrazine (pyz), pyridine 1-oxide (NOpy)} (1–3) and (II) trans-[ReO2L4]I (L = py, 3-methylpyridine (3-Mepy), 4-methylpyridine (4-Mepy)) (4a–6c). The structural studies of the first series (I) revealed that each complex comprises of trinuclear rhenium(III) core bridged by three μ-chlorido ligands with attached six terminal chlorido and three N-heterocyclic ligands.The products of the second kind are mononuclear rhenium(V) trans-dioxidocomplexes.All complexes were characterized by the single crystal X-ray diffraction, NMR, IR, FIR, UV–Vis spectroscopy, ESI-MS spectrometry and elemental analyses.

Graphical abstractReactivity of ReCl3 and ReI3 in the presence of excess of N-heterocyclic compounds was observed. Two kinds of complexes: (I) trinuclear chloridorhenium(III) of the formula [Re3Cl6(μ-Cl)3L3] {L = pyridine (py), pyrazine (pyz), pyridine 1-oxide (NOpy)} and (II) mononuclear dioxidorhenium(V) complexes of the formula trans-[ReO2L4]I (L = py, 3-Mepy, 4-Mepy) were synthesized. Structure investigation by single crystal X-ray diffraction and spectroscopic studies (NMR, IR, FIR, UV–Vis, ESI-MS) were performed.Figure optionsDownload full-size imageDownload as PowerPoint slide