Synthesis, Structure, and Properties of SupramolecularCharge-Transfer Complexes between Bis(18-crown-6)stilbene andAmmonioalkyl Derivatives of 4,40-Bipyridine and 2,7-Diazapyreneстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:4,40-Bipyridine and 2,7-diazapyrene derivatives (A) having two ammonioalkyl N-substituents were synthesized. The complex
formation of these compounds with bis(18-crown-6)stilbene (D) was studied by spectrophotometry, cyclic voltammetry, 1H NMR
spectroscopy, and X-ray diffraction analysis. In MeCN, π-donor D and π-acceptors A form supramolecular 1:1 (D3 A) and 2:1
(D3 A 3D) charge-transfer complexes. The D3 A complexes have a pseudocyclic structure as a result of ditopic binding of the
ammonium groups to the crown-ether fragments. The better the geometric matching between the components, the higher the
stability of the D3 A complexes (log K up to 9.39). A key driving force of the D3 A 3D complex formation is the excessive steric strain
in the precursor D3 A complexes. The pseudocyclic D3 A complexes involving the ammoniopropyl derivative of 4,40-bipyridine were
obtained as single crystals. Crystallization of the related ammonioethyl derivative was accompanied by transition of the D3 A
complexes to a structure of the (D3 A)m coordination polymer type.