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THIACALIX[4]ARENES: SYNTHESIS AND MOLECULAR
RECOGNITION OF SOME ANIONS
A.A. Yantemirova,
R.V. Nosov, A.N. Yagarmina, I.I. Stoikov, I.S. Antipin,
A.I. Konovalov
A.M. Butlerov Chemical Institute, Kazan (Volga Region) Federal University, 420008
Kremlevskaya, 18, Kazan, Russian Federation. E-mail: anelia_86@mail.ru
The potential uses of products of supramolecular chemistry and the ability of
these products to exhibit properties typical of highly organized biomolecules, e.g.
molecular recognition, catalysis, active and selective transport, has promoted research in
the chemistry of synthetic receptors. The design and synthesis of systems, capable of
recognizing anions, continues to be one of the challenging problems in supramolecular
chemistry. For the synthesis of anion receptors we had proposed to use derivatives of
thiacalixarene with different substituents at the lower rim. Regioselective
functionalization of the lower rim of the thia-analog of calixarene is significantly
complicated because of the difficulties in selection of the reaction conditions (ratio of
reagents, temperature and duration of the synthesis). Therefore, synthesis of
thiacalix[4]arenes with different substituents at the lower rim is commonly more
difficult than that of the other similar macrocycles substituted with identical fragments.
New thiacalix[4]arenes containing amide, hydroxyl and ester fragments differently
substituted at the lower rim were synthesized. For the synthesis of stereoisomers of p-
tert-butyl thiacalix[4]arene with ester and amide fragments at the lower rim, the
template effect of alkali metal cations was used. Receptor properties of the newly
synthesized thiacalix[4]arene derivatives toward some tetrabutylammonium salts n-
Bu4NX (X =F - , Cl - , Br - , I - , CH3CO2 - , H2PO4 - , NO3 -
) were studied by UV spectroscopy.
Selective receptors for fluoride ion and dihydrogen phosphate ion were found.
This work was supported by Federal Program "Research and scientific-
pedagogical cadres Innovative Russia" in 2009-2013 years (№ P1295 on 9 June 2010),
RFBR (09-03-00426, 10-03-92661-NSF) and the Program of the President of the
Russian Federation for the State support of young Russian scientists - Doctors of
Sciences (MD-2747.2010.3).