Interrelation of magnetic and spectroscopic properties for d0, d2 and d3 electron structure in the VII th transition group of elements

Recent advances in the chemistry of rhenium

“…292 The five-coordinate complexes are unsaturated and readily increase their coordination number to six,294•302 whereas ReOCI3(tdpme) dissociates to a six-coordinate isomer in which tdpme is bidentate.292 Most well-established oxo complexes are described in Table II, but protonated species are omitted. All Rev oxo species are diamagnetic though weak, temperature-independent paramagnetism (TIP) equivalent to 0.3-0.8 BM usually remains when allowance is made for the diamagnetism of the ligands. 128•295•310 The infrared spectra have been tabulated311 and discussed.312"314 The terminal Re-0 stretch in monooxo complexes and in the binuclear µ-species lies within 912-995 cm- 1.312 Trans dioxo species have bands at 775-835 cm-1 (i/as(Re02)) and 220-270 cm-1 (<5(Re02)), with i's(Re02) (ca. 800 cm-1) active only in the Raman.…”

Electron spin resonance and optical spectra of the hexachloromanganate(IV) ion

“…They are unstructured at 77°K and at this temperature are at somewhat higher energy than the bands observed in solution. 10 The spectra of various crystals, however, show other weak bands and interesting spectral features which must be explained. Most noticeable are weak broad bands at 12,020, 21,750, 22,430, 29,560, 31,210, and 34,930 cm"1 (not shown here), as well as fine structure on the 25,500-cm"1 band.…”