The hydro(solvo)thermal reactions
of Zn(NO3)2·6H2O, bis(pyridin-4-yl)benzothiadiazole
(BTD-bpy),
and benzene-1,3,5-tricarboxylic acid (H3btc) or naphthalene-1,4-dicarboxylic
acid (1,4-H2ndc) yielded the corresponding coordination
polymers {[Zn2(Hbtc)2(BTD-bpy)(MeOH)2]·MeOH}
n
(1) and {[Zn2(1,4-ndc)2(BTD-bpy)]·0.5MeOH·H2O}
n
(2), respectively. Compound 1 has a two-dimensional (2D) decorated layer structure of
an sql net with sufficient free volumes of 19.8%. Compound 2 exhibits a three-dimensional (3D) pillared-layer open framework
of a pcu net; two such identical frameworks are mutually
interpenetrated with each other to form overall 2-fold interpenetating
frameworks with sufficient free volumes of 19.8%. Compounds 1 and 2 both showed blue fluorescence in the
solid state and in different solvent suspensions. The luminescence
properties of 1 and 2 were exploited as
multiresponsive luminescence sensors for the sensitive detection of
Cr2O7
2
– and MnO4
– with a low detection limit and high selectivity
over other anions in DMF suspensions through luminescence quenching.
Additionally, the same DMF suspensions were also utilized to selectively
recognize trace amounts of Fe3
+ among large
pools of different metal ions with excellent anti-interference ability,
high sensitivity, and low detection limit. Of particular note, compounds 1 and 2 exhibited two different modes for Fe3
+ detection, showing an abnormous luminescence
enhancement–quenching (turn-on–turn-off) sensing mechanism
for the former and a regular luminescence quenching (turn-off) response
for the latter.
A dinuclear molecular cadmium phosphonate, [Cd2(H4tpmm)2(Hpybim)2(H2O)4]·2H2O (1·2H2O), emitting strong luminescence in both solid-state and suspension phase has been synthesized by the reaction of Cd(ClO4)2, 2,4,6-tris(phosphorylmethyl)mesitylene (H6tpmm), and 2-(2-pyridyl)benzimidazole (Hpybim) through...
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