Spectrophotometric and Potentiometric Studies on the Binding Abilities of Two Novel Tripodal Imine-Phenol Ligands Towards Al(III) and Ga(III)
In: Journal of Solution Chemistry, Jg. 40 (2011-06-30), S. 1187-1199
Online
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Zugriff:
The aqueous coordination behavior of two novel tripodal imine-phenol ligands, cis,cis-1,3,5-tris{(2-hydroxybenzilidene)aminomethyl}cyclohexane (TMACHSAL, L1) and cis,cis-1,3,5-tris{[(2-hydroxyphenyl)ethylidene]aminomethyl}cyclohexane (Me3- TMACHSAL, L2) with Al3+ and Ga3+ has been investigated at an ionic strength of 0.1 mol⋅dm−3 KCl and 25±1 °C by potentiometric and spectrophotometric methods. Both ligands formed various monomeric metal complex species MLH3, MLH2, MLH, ML and MLH−1 with Ga(III); and MLH3, ML and MLH−1 with Al(III). The Ga(III) complexes showed higher thermodynamic stability than the Al(III) complexes. Semi-empirical PM6 calculations along with TDDFT/B3LYP/3-21G calculations have been performed to complement the experimental measurements. The calculated structure of the metal complexes predicted a distorted octahedral geometry where favorable ring-flipping from the equatorial conformation in uncomplexed ligands to the axial conformation was observed upon chelation.
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Spectrophotometric and Potentiometric Studies on the Binding Abilities of Two Novel Tripodal Imine-Phenol Ligands Towards Al(III) and Ga(III)
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Autor/in / Beteiligte Person: | Sahoo, Suban K. ; Kanungo, B. K. ; Rati Kanta Bera ; Baral, Minati |
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Zeitschrift: | Journal of Solution Chemistry, Jg. 40 (2011-06-30), S. 1187-1199 |
Veröffentlichung: | Springer Science and Business Media LLC, 2011 |
Medientyp: | unknown |
ISSN: | 1572-8927 (print) ; 0095-9782 (print) |
DOI: | 10.1007/s10953-011-9716-0 |
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