Spectrophotometric studies of alkali metal ion complexes of tetrapropoxy-monoamine and tetrabutoxy-triamine calix[4]arenes

Gharib, Farrokh and Osouleddini, Noushin and Zare, Karim and Taghvaei-Ganjal, Saeed (2008) Spectrophotometric studies of alkali metal ion complexes of tetrapropoxy-monoamine and tetrabutoxy-triamine calix[4]arenes. In: 11th Iranian Physical Chemistry Seminar-July 2008, July 2008, Ardabil, Iran.

[img] Text
2.pdf

Download (13kB)
Official URL: http://uma.ac.ir/

Abstract

The cyclic oligomers of phenolic units linked through the ortho position, called calixarenes, associate their skeleton simplicity with versatile recognition properties both of ions and neutral molecules.1 Calixarenes are basket-shaped compounds by potential interest for host-guest complexation. Functionalization at the lower and upper rim may lead to design and synthesis of the ligands suitable for various metal complexations. The control of cation-binding ability of calixarenes has been the subject of more recent investigations.2 A quantitative measure of the interaction strength between two chemical species (macrocycle and guest) in the given solvent is provided by stability constant and the conformation of both uncomplexed and complexed species appears to be a distorted cone. The focus has been on the introduction of donor groups onto the calixarene framework for controlling their complexation phenomena. The ability of calixarene systems to interact with alkali metal ions has been long recognized and has led to several ionophores increasingly selective for a specific cation. A variety of optical methods for the detection of cations in solution is well established and has been extensively reviewed. One of the successful approach is using spectrophotometic properties of calixarenes. These compounds show UV absorption bands at around 260- 300 nm due to the electronic transitions in the phenol groups. For photometric diagnosis of an ion or molecule by calix[n]arene, therefore, a spectroscopic active chromophore(s) should be introduced to the molecule, since calix[n]arenas themselves do not exhibit absorption and emission in the visible region. Calix[4]arene derivatives can adopt four different conformations: cone, partial cone, 1,2-alternate, and 1,3-alternate which their selectivity of complexation towards metal ions have been proved to depend on the conformation of the calix[4]arene moiety.

Item Type: Conference or Workshop Item (Paper)
Persian Title: Spectrophotometric studies of alkali metal ion complexes of tetrapropoxy-monoamine and tetrabutoxy-triamine calix[4]arenes
Persian Abstract: -
Subjects: Divisions > Conferences > 11th Iranian Physical Chemistry Seminar- July 2008
Conferences > 11th Iranian Physical Chemistry Seminar- July 2008
Divisions: Conferences > 11th Iranian Physical Chemistry Seminar- July 2008
Subjects > Conferences > 11th Iranian Physical Chemistry Seminar- July 2008
Date Deposited: 17 Jun 2019 05:58
Last Modified: 17 Jun 2019 05:58
URI: http://repository.uma.ac.ir/id/eprint/6844

Actions (login required)

View Item View Item