Protolytic properties and molecular structure of 2,8,14,20-tetramethyl-5,11,17,23-tetrakis(N-morpholino)methylcalix[4]resorcinolarene

Authors
Morozova, YE Gubaidullin, AT Kazakova, EK Mustafina, AR Zotkina, VV Litvinov, IA Konovalov, AI
Citation
Ye. Morozova et al., Protolytic properties and molecular structure of 2,8,14,20-tetramethyl-5,11,17,23-tetrakis(N-morpholino)methylcalix[4]resorcinolarene, RUSS J G CH, 71(1), 2001, pp. 119-125
Citations number
25
Categorie Soggetti
Chemistry
Journal title
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
ISSN journal
10703632 → ACNP
Volume
71
Issue
1
Year of publication
2001
Pages
119 - 125
Database
ISI
SICI code
1070-3632(200101)71:1<119:PPAMSO>2.0.ZU;2-7
Abstract
The protolytic properties of 2,8,14,20-tetramethyl-5,11,17,23-tetrakis(N-mo rpholino)methyicalix[4]resorcinolarene were studied by pH-potentiometric ti tration. Its crystal and molecular structure was determined by single cryst al X-ray diffraction and UV spectroscopy. In solution the macrocycle exists as a zwitter-ion. In the crystal, the calixresorcinolarene molecule is in the cone conformation; two pairs of the opposite morpholine substituents ar e oriented inside and outside the macrocycle cavity and therefore show diff erent acid properties.