Crystal and molecular structure of [V2O3(sal-L-val)2(H2O)](sal-L-val =N-salicylidene-L-valinate) and spectroscopic properties of related complexes

Aminoacid-derivatized oxidovanadium complexes: Synthesis, structure and bromination reaction activity

“…In the respect, well-chosen aminoacid derivatives have been considered to be suitable candidates, which allow easy artificial linkage of various functional groups with N-terminal to generate a variety of multidentate oxidovanadium complexes [16]. To our best knowledge, although oxidovanadium complexes of aminoacid derivatives appear in the contemporary literature [16][17][18][19][20][21][22][23], such as: [V(O)(NMet)(l-OMe)] 2 ÁMeOH and [V(O)(NThr)(l-OMe)] 2 ÁMeOH (HNMet = N-(2-pyridylmethyl)-DL-methionine, HNThr = N-(2-pyridylmethyl)-DL-threonine) [16] [VO(Pic-AaR) 2 ] (Pic = picolyl-5-amide, AaR = HisH, HisMe, IleH, IleMe, TrpH, TrpMe, HTyrEt, containing aminoacid-salicylaldehyde ligands are very limited so far [24,25]. For quite sometime we have been engaging the study on the coordination behavior of glycine-salicylaldehyde derived ligands with diverse transition metal ions [25][26][27].…”

Solid state and solution studies of a vanadium(III)-l-cysteine compound and demonstration of its antimetastatic, antioxidant and inhibition of neutral endopeptidase activities

“…1) does not clearly correspond to an oxovanadium(IV) compound. The CD spectra of oxovanadium(IV) complexes typically contain two bands at %550 and 740 nm [24]; however, in the CD spectrum of 1 at least four bands are present in the range 400-1000 nm (Fig. 1).…”

“…Such paired microscope slides were placed in the sample compartment, which was kept under nitrogen. Each final spectrum is the average of four spectra recorded as previously described [24]. The position of the baseline is not exactly known and the spectra obtained are a representation of ellipticity (m deg) versus k.…”

“…For solution CD spectra a representation of De m values versus k [De m ¼ differential absorption/(bC V ) where b ¼ optical path and C V ¼ total vanadium concentration]. For running solid state CD spectra, samples of compounds were prepared as described previously [24] in KBr disks, and placed between two microscope slides. Such paired microscope slides were placed in the sample compartment, which was kept under nitrogen.…”

Thirty years through vanadium chemistry

“…Another example later reported by our group was Na 2 ] by Chakravorty [141]. These complexes are easily oxidized to ( 4+ compounds, and several complexes containing the V 2 O 3 4+ unit were characterized by single crystal XRD, namely containing N-salicylideneamino acidato ligands [105,130,131,142,143]. One interesting aspect of the mixed valence complexes ( 3+ is the possibility of (a) either having localized V IV and V V centers apparently due to no overlap between the d xy orbitals across the oxido bridge; these complexes depict a 8-line EPR spectra, or (b) possess structures with delocalized electrons and exhibit 15-line EPR spectra as a result of hyperfine coupling of the two V nuclei; this last group may also display relatively strong intervalence charge transfer bands at ca.…”