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In particular, spectral and theoretical analyses reveal the destruction of n → π* transitions therefore the look of intramolecular charge-transfer changes upon pyridyl protonation. Furthermore, by virtue regarding the pH-responsive fluorescence, the MOF reveals appealing sensing performance when it comes to recognition of 3-nitropropionic acid, a major mycotoxin in moldy sugar-cane.A novel 3D luminescent control polymer (LCP) [Zn4(3-dpyb)2(odpa)2(H2O)3]·4H2O (1) (3-dpyb = N,N'-bis (3-pyridinecarboxamide