abstract
Five new Cd-II-based ternary metal-organic frameworks (MOFs) constructed from structurally related ligands, namely, [Cd(L1)(DCTP)](n)(1), [Cd-2(L2)(2)(DCTP)(2)](n)(2), {[Cd-2(L3)(DCTP)(2)]center dot 3.75H(2)O}(n)(3), {[Cd(L4)(DCTP)]center dot 0.85H(2)O}(n)(4) and [Cd-0.5(L5)(0.5)(DCTP)(0.5)](n)(5) (H2DCTP = 2,5-dichloroterephthalic acid, L1 = 1,4-di(1H-benzo[d]imidazol-2-yl)butane, L2 = 1,5-di(1H-benzo[d]imidazol-2-yl)pentane, L3 = 1,3-bis(1-(pyridin-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)propane, L4 = 1,4-bis(1-(pyridin-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)butane and L5 = 1,6-bis(1-(pyridin-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)hexane), have been hydrothermally synthesized and characterized. While1and5show the common 2Dhcband 3Dsqc6topologies, respectively,2exhibits a rare (4,4)-connected 2-node 2D4,4L62network,3reveals an unprecedented 3D (3,3,4,5)-connected framework with the point symbol {4 center dot 9(2)}(2){4(2)center dot 8(2)center dot 9(2)}{4(2)center dot 8(4)center dot 9(3)center dot 10}(2){9(3)}(2)and4presents an unusual (3,5)-connected 3Dgratopological framework. The results show that the coordination mode of dicarboxylate ligands and the auxiliary N-containing linkers have a crucial impact on the structural diversities of ternary Cd-MOFs. Further,2and3are favorable dual-functional fluorescent sensors for the detection of Fe3+/acetylacetone and Cr2O72-(pH = 4)/acetylacetone, respectively, with high sensitivity and selectivity.
keywords
CADMIUM(II) COORDINATION POLYMERS; SONOCHEMICAL SYNTHESIS; STRUCTURAL DIVERSITY; FLUORESCENT SENSORS; CRYSTAL-STRUCTURE; FAST-RESPONSE; FE(III) IONS; CR(VI) IONS; LIGANDS; FE3+
subject category
Chemistry; Crystallography
authors
Shi, YS; Liu, D; Fu, LS; Li, YH; Dong, GY
Groups
acknowledgements
This project was supported by the National Natural Science Foundation of China (51474086). This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.