A reinvestigation of dioxobis(ethylenediamine)rhenium(V) chloride and dioxotetrakis(pyridine)rhenium(V) chloride dihydrate

PRESSURE-INDUCED CHANGE OFd-dLUMINESCENCE ENERGIES, VIBRONIC STRUCTURE AND BAND INTENSITIES IN TRANSITION METAL COMPLEXES

“…[38][39][40][41][42][43][44] Many complexes with different ancillary ligands show almost identical rhenium-oxo bond lengths of 1.765 Å , varying by only 0.001 Å for trans-dioxo complexes of rhenium(V) with ethylenediamine, pyridine and 1-methylimidazole ligands in the xy plane. [45,46] Figure 3 shows the pressure-dependent luminescence spectra of trans-ReO 2 (py) 4 I and trans-ReO 2 (tmen) 2 Cl at room temperature. [47][48][49] The abbreviations py and tmen denote pyridine and tetramethylethylenediamine ligands, respectively.…”

ReO2+chelates with aliphatic diamines. Structural and proton transfer properties

“…1,2 Bidentate aliphatic amines, like other neutral ligands, generally prefer the [ReO 2 ] + center. For example, [ReO 2 (en) 2 ] + (en = ethylenediamine), 3 [ReO 2 (tn) 2 ] + (tn = trimethylenediamine), 4 [ReO 2 (eten) 2 ] + (eten = N-ethylethylenediamine), 5 were characterized many years ago. Very recently, these complexes have attracted considerable interest since they proved useful for different applications.…”

A ‘2+2’ complex of trans-[ReO2]+ with isocyanide and triphenylphosphine

“…The crystal structure consists of two independent cations per unit cell with the associated perrhenate anions. [11][12][13][14]. The Re\C bond distances [average of 2.10(2) Å] correspond well with those in other isocyanide monooxorhenium(V) complexes [average of 2.08(2) Å], and suggest that π-back bonding from rhenium(V) to the isonitriles is not extensive [8,9].…”

“…This is the first reported dioxo isocyanide complex of rhenium(V), and it is unusual since it contains the good π-acceptor ligands PPh 3 and CNCy coordinated to the electron-deficient and hard ReO 2 + core. The trans-[ReO 2 ] + core is common for rhenium(V), and it is normally formed when ligands which are only σ-donors or poor π-donors are coordinated to the metal [11][12][13][14]. It would seem that the small cone angle of the isocyanide is essential for the stabilization of counter-ion at 904 cm − 1 .…”