Five new 3D transition MOFs based on 1-(3,5-dicarboxylatobenzyl)-3,5-pyrazole dicarboxylic acid displaying unique luminescence sensing towards Fe3+ and magnetic properties

摘要

Five new 3D MOFs: {[Zn-3(HL)(2)H2O]center dot 4H(2)O}(n) (1), {[Ba2L5H2O]center dot 2H(2)O}(n) (2), {[Ba-4(L)(2)center dot 5H(2)O]center dot 2H(2)O}(n) (3), {[Cd-3(HL)(2)center dot Cl-2 center dot 2H(2)O]center dot 2H(2)O}(n) (4) and {[Cu-2(L)(2)center dot 2H(2)O]center dot 4H(2)O}(n) (5), were constructed based on 1-(3,5- dicarboxylatobenzyl)-3,5-pyrazole dicarboxylic acid. Structural analysis shows that 1-5 have 3D frameworks, among which 1(Zn) exhibits high luminescence sensing for Fe3+ ions, excellent framework stability and reusability. The sensing mechanism of 1(Zn) is briefly discussed. In addition, 5(Cu) displays antiferromagnetic exchange phenomena.