Authors:K. C. Malhotra, N. Sharma, S. S. Bhatt, and S. C. Chaudhry
Thermal behaviour of aryloxides of titanium(IV) of composition TiCln(OAr)4−n (wheren=0→3 and OAr=OC6But-4, OC6H4OMe-4 and OC6H2-Bu2t-2,6−Me-4) has been studied by DTA and TG analysis. Multiple decomposition steps have been indicated by thermal weight losses which are both exothermic and endothermic as shown by DTA curves. Based upon the total % loss in weight; during entire decomposition titanium dioxide has been found to be the final residue in each case.
Authors:N. Sharma, A. Sood, S. Bhatt, and S. Chaudhry
The thermal decomposition of the complexes [Vcl (acac)2(OAr)] (where acac=2,4-pentanedionato anion; OAr=–OC6H4O-M-4, OC6H4OBut-4) has been studied using non-isothermal techniques (DTA and TG). The TGA indicate that the substitution of chlorine
in VCl2(acac)2 with aryloxide ligands results in an increase in the initial temperature of decomposition (IDT) of the new complexes. The role of the substituent at the aryloxide ring on the thermal stability of the complexes is depicted
and hence described. The ultimate decomposition product in all the complexes has been identified as V2O5. The kinetic and thermodynamic parameters namely, the energy of activation E, the frequency factor A, entropy of activation S and specific reaction rate constant kr etc. have been rationalized in relation to the bonding aspect of the aryloxide ligands.
Authors:Neeraj Sharma, Amit Pathania, and Mala Sharma
niobium chemistry has centred on complexes derived from alkoxo and aryloxo ligands which can be easily modified in steric bulk by substitution. Furthermore, niobium alkoxides, chloroalkoxides, heterometallic alkoxides and aryloxides have been extensively
Kinetic data, Hammett relationships for the substituent effects of aryl Grignard reagents, arenesulfonyl groups and aryloxide groups, and activation parameters provided some support to exclude a single step concerted S N 2(S) mechanism.