By
employing a pyridyl-decorated dicarboxylic acid ligand, 3-(2′,5′-dicarboxylphenyl)pyridine
acid (H2dcpy), a three-dimensional In3+-based
metal–organic framework, H3O[In3(dcpy)4(OH)2]·3DMF·4H2O (1), with a good chemical stability toward acid and base has been synthesized.
The compound 1 shows an uncommon (3,8)-connected tfz-d;
UO3 topological net based on linear In3(COO)4(OH)2 clusters and also contains one-dimensional
open channels. Particularly, 1 contains two types of
dcpy2– linkers, in which the pyridyl group in one
participates in coordination with the In3+ ion, whereas
that in the other is uncoordinated but hangs in the inner sides of
the channels as functionalized sites. Gas adsorption experiments demonstrate
that 1 is able to selectively adsorb C2H2, C2H4, and CO2 over CH4. Simultaneously, 1 shows a highly selective
and sensitive fluorescence detection toward Fe3+ ion in
water with good recyclability.
Two
isomeric metal–organic frameworks, consisting of Co-triazolate
layers and positional isomeric dicarboxylate pillars, both show distinct
temperature-dependent CO2 sorption behaviors. Because of
the pores functionalized by amino groups, both materials have high
CO2 uptake and highly selective sorption of CO2 over CH4 and N2.
On the basis of a
temperature-induced effect, the solvothermal reaction of Co(Ac)2·4H2O, 5-amino-2,4,6-triiodoisophthalic acid
(H2atibdc), and 1,4-bis(2-methyl-imidazol-1-yl)butane (bib)
at 80 °C gave a new coordination polymer [Co(bib)(atibdc)]
(1), which shows a two-dimensional (2D) network with
left- and right-handed helical chains. By raising the reaction temperature
to 130 °C, a pair of homochiral enantiomers [Co(bib)(atibdc)]·2H2O (2, 2M, and 2P) were
successfully obtained, displaying a three-dimensional (3D) framework
with three kinds of unique helical chains. Keeping the temperature
of the reaction system to 150 °C, excited, an in situ iodine
elimination reaction occurred, and a new linker 5-aminoisophthalic
acid (H2aipa) was generated, which then cooperated with
the bib ligand to construct a coordination polymer [Co(bib)(aipa)]
(3), showing a 3D 3-fold interpenetrating architecture.
The comparison of final solid structures exhibits an exclusive temperature-induced
effect on the construction of the coordination polymer. Furthermore,
via a single-crystal-to-single-crystal (SCSC) transformation, the
2D network of 1 can be derived from the 3D framework
of 2, which presents a rare type of temperature-solvent
induced SCSC transformation. In addition, the magnetic properties
of 1–3 have been investigated as
well.
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