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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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Abstract

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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Authors and Affiliations

  1. Department of Applied Chemistry, S.V. National Institute of Technology (SVNIT), Surat, Gujrat, India

    Suban K. Sahoo

  2. Department of Chemistry, National Institute of Technology (NIT), Kurukshetra, Haryana, India

    Minati Baral

  3. Department of Chemistry, Sant Longowal Institute of Engineering and Technology (SLIET), Longowal, Punjab, India

    Rati Kanta Bera & B. K. Kanungo

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  1. Suban K. Sahoo
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  2. Minati Baral
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  4. B. K. Kanungo
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Correspondence to Suban K. Sahoo.

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Sahoo, S.K., Baral, M., Bera, R.K. et al. Spectrophotometric and Potentiometric Studies on the Binding Abilities of Two Novel Tripodal Imine-Phenol Ligands Towards Al(III) and Ga(III). J Solution Chem 40, 1187–1199 (2011). https://doi.org/10.1007/s10953-011-9716-0

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  • DOI: https://doi.org/10.1007/s10953-011-9716-0

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