Unknown

Dataset Information

0

Winged-Cone Conformation in Hexa-p-tert-butylcalix[6]arene Driven by the Unusually Strong Guest Encapsulation.


ABSTRACT: Hexa-p-tert-butylcalix[6]arene (1) is believed to adopt a winged conformation in a solution, featured by four phenyl rings perpendicular to the calix basis and two others at 1,4-positions lying down. However, there is some controversy on the occurrence of this conformation because it has never been found in the solid state of calix[6]arenes, regardless of the substitution pattern at lower and upper rims. Here, we have observed the winged-cone conformation for the first time in a solvate form of 1 with dimethyl sulfoxide (DMSO), dimethylformamide, and pyridine. The DMSO molecule is strongly encapsulated into 1 through two OH···O hydrogen bonds with both flattened phenolic moieties, one lp(S)···? and four CH···? interactions with the four perpendicular phenyl rings. This host-guest complex has energy lower by 23.4 kcal mol-1 than the isolated species. In addition, another DMSO solvate form with 1,2,3-alternate conformation was also obtained in this study, and its structure is compared with that of the precedent one. A detailed density functional theory study has also been carried out to understand the energetic relationships among cone conformers, intramolecular hydrogen-bonding patterns, and DMSO encapsulation.

SUBMITTER: Martins FT 

PROVIDER: S-EPMC6641646 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature

altmetric image

Publications

Winged-Cone Conformation in Hexa-<i>p-tert</i>-butylcalix[6]arene Driven by the Unusually Strong Guest Encapsulation.

Martins Felipe Terra FT   Oliveira Breno Germano de Freitas BGF   Sarotti Ariel M AM   de Fátima Ângelo   

ACS omega 20170831 8


Hexa-<i>p</i>-<i>tert</i>-butylcalix[6]arene <b>(1)</b> is believed to adopt a winged conformation in a solution, featured by four phenyl rings perpendicular to the calix basis and two others at 1,4-positions lying down. However, there is some controversy on the occurrence of this conformation because it has never been found in the solid state of calix[6]arenes, regardless of the substitution pattern at lower and upper rims. Here, we have observed the winged-cone conformation for the first time  ...[more]

Similar Datasets

| S-EPMC4491503 | biostudies-literature
| S-EPMC9128855 | biostudies-literature
| S-EPMC3344542 | biostudies-literature
| S-EPMC6630091 | biostudies-literature
| S-EPMC6122204 | biostudies-literature
| S-EPMC9306641 | biostudies-literature
| S-EPMC9386809 | biostudies-literature
| S-EPMC4928063 | biostudies-literature
| S-EPMC5360353 | biostudies-literature
| S-EPMC9413269 | biostudies-literature