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Molecules 2013, 18(10), 12041-12050; doi:10.3390/molecules181012041
Article

Conductance Studies on Complex Formation between c-Methylcalix[4]resorcinarene and Titanium (III) in Acetonitrile-H2O Binary Solutions

1,2, 2,* , 3,* , 4,5 and 4
Received: 25 April 2013; in revised form: 8 May 2013 / Accepted: 10 May 2013 / Published: 27 September 2013
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Abstract: Calixresorcinarenes have proved to be unique molecules for molecular recognition via hydrogen bonding, hydrophobic and ionic interactions with suitable substrates such as cations. The study of the interactions involved in the complexation of different cations with calixresorcinarenes in solvent mixtures is important for a better understanding of the mechanism of biological transport, molecular recognition, and other analytical applications. This article summarizes different aspects of the complexes of the Ti3+ metal cation with c-methylcalix[4]resorcinarene (CMCR) as studied by conductometry in acetonitrile (AN)–water (H2O) binary mixtures at different temperatures. Conductance data show that the metal cation/ligand (ML) stoichiometry of the complexes in solution is 1:1 in all cases. Non-linear behaviour was observed for the variation of logKf of the complexes vs. the composition of the binary solvent mixtures. Selectivity of CMCR for the Ti3+ cation is sensitive to solvent composition; in some cases and at certain compositions of the mixed solvent systems, the selectivity order is changed. Values of thermodynamic parameters (,) for formation of the CMCR–Ti3+ complexes in AN–H2O binary systems were obtained from the temperature dependence of stability constants, and the results show that the thermodynamics of complexation reactions are affected by the nature and composition of the mixed solvents.
Keywords: conductance data; calixresorcinarenes; titanium(III); c-methylcalix[4]- resorcinarene; acetonitrile (AN)-water (H2O); binary mixtures conductance data; calixresorcinarenes; titanium(III); c-methylcalix[4]- resorcinarene; acetonitrile (AN)-water (H2O); binary mixtures
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Rezayi, M.; Alias, Y.; Abdi, M.M.; Saeedfar, K.; Saadati, N. Conductance Studies on Complex Formation between c-Methylcalix[4]resorcinarene and Titanium (III) in Acetonitrile-H2O Binary Solutions. Molecules 2013, 18, 12041-12050.

AMA Style

Rezayi M, Alias Y, Abdi MM, Saeedfar K, Saadati N. Conductance Studies on Complex Formation between c-Methylcalix[4]resorcinarene and Titanium (III) in Acetonitrile-H2O Binary Solutions. Molecules. 2013; 18(10):12041-12050.

Chicago/Turabian Style

Rezayi, Majid; Alias, Yatimah; Abdi, Mahnaz M.; Saeedfar, Kasra; Saadati, Naghmeh. 2013. "Conductance Studies on Complex Formation between c-Methylcalix[4]resorcinarene and Titanium (III) in Acetonitrile-H2O Binary Solutions." Molecules 18, no. 10: 12041-12050.


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