Ligand control of the redox properties of dioxomolybdenum(VI) coordination complexes

TiIV Complexes of Redox‐Active Schiff Bases

“…We thereby conclude that stable coordination is only possible for one Ti at only one coordination site, with the other site remaining in the thiazoline form. This was supported by 13 C NMR spectroscopy, particularly by the diastereotopicity of the -OCR(CH 3 ) 2 (R = H, CH 3 ) groups, for which each complex showed two carbon signals. The selective coordination of one metal can be rationalized as follows: the initial coordination of the ligand to the metal likely occurs at the oxygen atom.…”

“…The structures were confirmed by 13 C NMR and, in two cases, by crystallography (vide infra). EI mass spectrometry was uninformative and showed too much fragmentation.…”

“…Of these seven, five have been described previously, but detailed procedures were available only for H 2 I, [11] H 2 II, [12] H 2 IV [12,13] and H 2 VII. [14] The synthesis of H 2 V [15] has been claimed, but no procedure, spectroscopic data or elemental analysis have been reported; yields and NMR spectroscopic data for H 2 II and H 2 IV were also lacking.…”

“…Their 1 H and 13 C NMR spectra were obtained, for consistency, in [D 6 ]DMSO because of the limited solubility of some (H 2 I, H 2 II, H 2 III and H 2 VI) in CDCl 3 . In particular, H 2 III gave an indistinct room-temperature NMR spectrum in CDCl 3 with only very broad signals, which lacked a visible singlet or the sharp peaks typical of thiazole forms.…”

Excellent alkene epoxidation catalytic activity of macrocyclic‐based complex of dioxo‐Mo(VI) on supermagnetic separable nanocatalyst

“…[35] So, the appearance of two adjacent bands at 916 and 946 cm −1 was characteristic of the presence of MoO 2 group (Figure 1d). [36] The bands at 2938 and Comparison of the SEM images shows no change in morphology. Figure 4(c) shows TEM images of Fe 3 O 4 @SiO 2 -(CH 2 ) 3 -PBSB/MoO 2 nanocatalyst.…”