COMPLEXATION OF ALKALI METAL CATIONS BY P-SULFONATO CALIX(4) ARENE IN AQUEOUS SOLUTION

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OSOULEDDINI N.; GHARIB F.; ZARE K.

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Journal: JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY) Year:2009 | Volume:19 | Issue:72 (CHEMISTRY ISSUE) Page(s): 109-116

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Title

COMPLEXATION OF ALKALI METAL CATIONS BY P-SULFONATO CALIX(4) ARENE IN AQUEOUS SOLUTION

Author(s)

OSOULEDDINI N. | GHARIB F. | ZARE K. | Issue Writer Certificate

Keywords

FORMATION CONSTANTQ3

SPECTROPHOTOMETERIC TITRATIONQ3

ALKALI METAL CATIONQ3

P-SULFONATO CALIX(4)ARENEQ3

Abstract

Introduction: Calixarenes are obtained from the condensation of phenols with formaldehyde and possess a hydrophobic cavity capable of including molecular guests in solution. p-sulfonato calix (n) arenes are able to complex with variety of organic compounds as well as inorganic ions in water. It is known that calixarene molecules exhibit a strong sterical flexibility by comparing with cyclodextrins, and therefore there is a possibility to use calixarenes in a wide field of applications. There are many studies dedicated to calixarenes and their derivatives, most of them directed toward the selective complexation of biological substrates.Aim: The present study investigated the FORMATION CONSTANT for complexation of ALKALI METAL CATIONs by the water- soluble p-sulfonatocalix (4) arene and discussed about their interactions.Materials and Methods: All the measurements were carried out at 25o C and pH=2 using a spectrophotometer. Absorbance, A, was measured by successive addition of an ALKALI METAL CATION solution (Li+, Na+, K+, Rb+, Cs+) to p-sulfonatocalix (4) arene solution. Treatment of the spectrophotometric data obtained during the titrations was conducted with the computer program Squad.Results: The complexation of ALKALI METAL CATIONs by p-sulfonato calix (4) arene are consistent with the formation of a 1: 1 complex resulting from electrostatic interactions between the sulfonato groups and ALKALI METAL CATIONs. In this study, we determined FORMATION CONSTANTs (log K) of the complexes at pH 2 and 25oC, that were log KLi+=4.5130 ± 0.06, log KNa+=4.0898 ± 0.08, log KK+=3.9556 ± 0.04, log KRb+=3.4489 ± 0.07 and log KCs+=3.1601± 0.09, respectively.Conclusion: It is concluded that Li+ forms strongest binding with p-sulfonato calix (4) arene by cation-P interactions with benzene rings and electrostatic interactions with the SO3- groups because of suitable size-fit on cavity, whereas for Rb+ and Cs+ those are week because they have not significant cation- P interaction.

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APA: Copy

OSOULEDDINI, N., GHARIB, F., & ZARE, K.. (2009). COMPLEXATION OF ALKALI METAL CATIONS BY P-SULFONATO CALIX(4) ARENE IN AQUEOUS SOLUTION. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 19(72 (CHEMISTRY ISSUE)), 109-116. SID. https://sid.ir/paper/70610/en

Vancouver: Copy

OSOULEDDINI N., GHARIB F., ZARE K.. COMPLEXATION OF ALKALI METAL CATIONS BY P-SULFONATO CALIX(4) ARENE IN AQUEOUS SOLUTION. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)[Internet]. 2009;19(72 (CHEMISTRY ISSUE)):109-116. Available from: https://sid.ir/paper/70610/en

IEEE: Copy

N. OSOULEDDINI, F. GHARIB, and K. ZARE, “COMPLEXATION OF ALKALI METAL CATIONS BY P-SULFONATO CALIX(4) ARENE IN AQUEOUS SOLUTION,” JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), vol. 19, no. 72 (CHEMISTRY ISSUE), pp. 109–116, 2009, [Online]. Available: https://sid.ir/paper/70610/en

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