Resumo

LAURA, Mery; SANTELICES, Juan Carlos  e  CABRERA, Saúl. Titanium - Oxo- Hidroxo-Atrade Cluster (TOHAC): Nucleation in Aqueous System. Rev. Bol. Quim [online]. 2018, vol.35, n.2, pp.64-72. ISSN 0250-5460.

Abstract The molar ratio h = [H₂O] / [Titanatrane] (Titanatrane = N (CH₂CH₂O)₃Ti - Z with Z = -TEAH₂,-OR, -OH) (h = 556, 278 and 139) and temperature (T = 30, 50 and 70 °C) has been evaluated in the kinetics of formation of Titanium Oxo - Hydroxo - Atrane Clusters (TOHAC) in aqueous solution. The formation of the TOHAC was monitored by UV-Vis absorption, at a predefined wavelength of λ = 450 nm. The induction time and formation ratio of the "TOHAC" have been identified. The kinetic parameter (α) and the apparent activation energy (E_a) was calculated. We defined a new formation mechanism for TOHAC confirming the role of TEAH3 as a retardant agent of hydrolysis and condensation.

Palavras-chave : Tohac; Nucleation; Aqueous system.

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