Optically active derivatives of terephthalic acid: four crystal structures from two powder patternsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 24 апреля 2018 г.
Аннотация:A novel important class of nanoporous crystalline solids, metal–organic
frameworks (MOFs), composed of organic ligands (linkers) and metal ions, is
now considered as a platform for the development of various functional hybrid
materials. In order to design new MOF-based asymmetric catalysts, two
terephthalic acid derivatives, namely 2-{[1-(1-tert-butoxycarbonyl)-l-prolyl]-
amino}terephthalic acid, C18H22N2O7, (1), and 2-(l-prolylamino)terephthalic
acid, C13H14N2O5, (2), which could find potential applications as chiral linkers
for the construction of enantioselective MOFs, were synthesized and their
powder samples were measured at synchrotron station ID22 (ESRF). Each
sample contained two unknown crystalline phases, so four new crystal structures
were determined, namely, the 2.24-hydrate of (1), (1a) (space group C2221), and
the 2.08-hydrate of (1), (1b) (P2221), which are crystallohydrates, and two
polymorphs of (2), i.e. (2a) (C2221) and (2b) (P212121), and were validated with
DFT-d (dispersion-corrected density functional theory) optimizations.