Guest-driven unusual conformations in two calix[6]arene solvates and a new calix[8]arene

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dc.creatorFelipe Terra Martins
dc.creatorAngélica Faleiros da Silva Maia
dc.creatorFernando Machado dos Santos
dc.creatorMeiry Edivirges Alvarenga
dc.creatorLeandro Ribeiro
dc.creatorLeonardo da Silva Neto
dc.creatorÂngelo de Fátima
dc.date.accessioned2024-09-20T19:25:14Z
dc.date.accessioned2025-09-08T23:25:43Z
dc.date.available2024-09-20T19:25:14Z
dc.date.issued2018
dc.identifier.doihttps://doi.org/10.1515/zkri-2017-2110
dc.identifier.issn2194-4946
dc.identifier.urihttps://hdl.handle.net/1843/76754
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofZeitschrift für Kristallographie - Crystalline Materials
dc.rightsAcesso Restrito
dc.subjectCalixarenos
dc.subjectFuncionais de densidade
dc.subject.otherCalix[6]arene
dc.subject.otherCalix[8]arene
dc.subject.otherCrystal structure
dc.subject.otherDFT
dc.subject.otherSynthesis
dc.titleGuest-driven unusual conformations in two calix[6]arene solvates and a new calix[8]arene
dc.typeArtigo de periódico
local.citation.epage578
local.citation.issue8
local.citation.spage565
local.citation.volume233
local.description.resumoUnusual conformations have been found in a new calix[8]arene and in new solvates of two known calix[6]arenes. The chair-like conformation with 2/m point group symmetry was found for the first time in the dimethylformamide (DMF) disolvate of the basic calix[6]arene (1) without substituents in the lower and upper rims. Such symmetry is driven by the guest geometry allowing for two equivalent hydrogen bonding patterns in the chair seat. This avoids cone distortion found in the other chair-like conformers, although they have energies lower than that of new symmetrical conformer. The molecular conformation of hexa(carboxymethoxy)calix[6]arene (2) is also described as a dimethylsulfoxide (DMSO) pentasolvate. Its conformation can be described as a 1,3,5-closed cone with three alternate phenyl rings inclined inwards to the cone, thereby closing the cone entrance. Such a conformation also suggests five acid groups are pointed towards the same side of the calyx base and are able to bind metal ions or basic compounds in the lower rim, while inclusion of guests into the cone cavity is hindered. Both inclusion and cooperative acid binding/coordination abilities are still more hindered in the lowest energy 1,2,3-alternate cone conformer of 2. The role of the solvent in avoiding cone distortion was highlighted by inspecting the conformations of 5,11,17,23,29,35,41,47-octanitro-49,50,51,52,53,54,55,56-octa-n-butoxycalix[8]arene (3) and the known nitro analogues having methyl instead of n-butyl groups. Cone distortion is found in the non-solvated crystal form of 3, while non-classical hydrogen bonds with tetrahydrofuran preclude this in the literature analogue.
local.identifier.orcidhttps://orcid.org/0000-0001-9004-0927
local.identifier.orcidhttps://orcid.org/0009-0001-9314-9095
local.identifier.orcidhttps://orcid.org/0000-0002-9236-3524
local.identifier.orcidhttps://orcid.org/0000-0002-3686-7779
local.identifier.orcidhttps://orcid.org/0000-0003-4554-9577
local.identifier.orcidhttps://orcid.org/0000-0003-2344-5590
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://www.degruyter.com/document/doi/10.1515/zkri-2017-2110/html

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