Infrared spectra of first transition series metal tropolonates

Synthesis and characterization of bistropolonato oxovanadium(IV and V) complexes

“…-In the low-frequency region, spectra of VO(trp) 2 have some new bands that are absent in spectra of the free ligand. Therefore, and also taking into account previous results [35,36,41], these bands are assigned to vibrations involving V-O (metalto-ligand) bonds. Although in table 2 all these bands were identified as (VO), it is probable that some of them are originated in the deformational modes of the O¼VO 4 skeleton.…”

“…On the other hand, the position of this band clearly excludes the formation of bridging chain structures of the type Á Á Á V¼O Á Á Á V¼O Á Á Á V¼O Á Á Á , for which much lower frequencies are expected [40]. -Some typical ring vibrations were also assigned on the basis of previous studies of other metal tropolonates [36,41]. -In the low-frequency region, spectra of VO(trp) 2 have some new bands that are absent in spectra of the free ligand.…”

Mixed bivalent transition metal complexes of 1,10-phenanthroline and 2-aminomethylthiophenyl-4-bromosalicylaldehyde Schiff base: Spectroscopic, molecular modeling and biological activities

“…Two new bands appearing in the low frequency ranges 505-540 and 375-398 cm -1 are assigned to the υ(M-O) and υ(M-N) vibrations [57] respectively, supporting the participation of the nitrogen atom of the azomethine group and oxygen of the OH group of the ligand in the complexation with metal ions [56]. The values of υ(M-O) and υ(M-N) follow the order Cu > Ni > Co > Zn, in parallel with the crystal field stabilization energies [58,59].…”

Separation of Isomers and Mechanisms of Inversion of Stereochemistry of Group 9 d6 Tris-Chelate Complexes of Hinokitiol

“…The procedure was adapted from a literature procedure . CoCl 2 ·6H 2 O (100 mg) was dissolved in 5 mL of water, and 0.15 mL of 30% H 2 O 2 was then added to the solution.…”

“…The procedure was adapted from a literature procedure. 28 CoCl 2 •6H 2 O (100 mg) was dissolved in 5 mL of water, and 0.15 mL of 30% H 2 O 2 was then added to the solution. This solution was added to a solution of KHCO 3 (300 mg) in 10 mL of water at 0 °C.…”