A 3D porous framework ([Co 1.5 (tib)(dcpna)]·6H 2 O) (1) with a Wei topology has been synthesized by solvothermal reaction of 1,3,5-tris(1-imidazolyl)-benzene (tib), 5-(3 ,5 -dicarboxylphenyl)nicotinic acid (H 3 dcpna) and cobalt nitrate. The electrocatalytic activity for water oxidation of 1 has been investigated in alkaline solution. Compound 1 exhibits good oxygen evolution reaction (OER) activities in alkaline solution, exhibiting 10 mA·cm −2 at η = 360 mV with a Tafel slope of 89 mV·dec −1 . The high OER activity can be ascribe to 1D open channels along b axis of 1, which expose more activity sites and facilitate the electrolyte penetration.
Currently, metal–organic frameworks (MOFs) with
thiol functionalities
are used as advanced robust materials to solve the problems of pollution
and damage caused by metal ions in water. Herein, we report a framework
assembled by reacting cadmium nitrate with a new ligand, 4-methylthiopyridine-2,6-dicarboxylic
acid, which possesses methylthio and carboxyl functional groups. The
resultant MOFs exhibit 5-c net, fnb-type, uninodal net topology with
{33·4·64·72} point
symbols. The thiol-functionalized MOF features good thermal, water,
and pH stabilities and luminescence emission at different temperatures.
The methylthio-containing cadmium MOF (Cd-MOF) selectively detects
the heavy-metal ions Cu2+, Hg2+, and Pb2+ in water by luminescence quenching, with low limits of detection
(LODs) of 22.60 × 10–7, 11.07 × 10–6, and 9.58 × 10–6 M, respectively.
The highly selective response and performance of the Cd-MOF probe
toward Cu2+, Hg2+, and Pb2+ ions
were determined by investigating the effects of other interfering
ions and different pH values, and the reusability performance was
evaluated.
A highly symmetric bis-triazole-pyridine-based organic
ligand,
i.e., 3,5-di(4H-1,2,4-triazol-4-yl)pyridine (L), and Cu(II) salts were used to synthesize three cationic
Cu(I) metal–organic frameworks (MOFs), namely, {[Cu(L)]·(NO3)·(H2O)}
n
(1), {[Cu(L)]·(BF4)·0.5H2O}
n
(2), and {[Cu1.25(L)]·1.25(ClO4)·H2O}
n
(3). All three MOFs have nonbonded anions situated inside the
pore spaces. Both 1 and 2 have a two-dimensional
network structure, while 3 has a three-dimensional structure.
All three MOFs were characterized using Fourier transform infrared
spectroscopy, elemental (C, H, and N) analysis, thermogravimetric
analysis, and powder and single-crystal X-ray diffraction. Due to
the presence of a Lewis basic pyridine moiety, these MOFs could serve
as luminescent probes for the selective detection of Ce3+ ions with excellent efficiency (10–7 M). The synthesis
of Cu(I)-based MOFs and their use to detect Ce3+ ions in
water via a turn-on fluorescence process have rarely been reported.
These MOFs are highly stable in water, are recyclable, and function
efficiently at different pH values.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.