Developing stable sensing materials for the sensitive detection of phenylglyoxylic acid (PGA) in biological sample is pretty important for the early diagnosis, recognition and treatment of related diseases. In this work, a Zn(II)-based coordination polymer (CP), n (1) (H2L = 2,6-di(4-carboxylphenyl)-4-(4-(triazol-1-ylphenyl))pyridine, and bibp = 4,4’-bis(imidazolyl)biphenyl), has been solvothermally obtained with good chemical and thermal stabilities. Concurrently, 1 showed an excellent fluorescence turn-off response capability for the detection of the styrene biomarker PGA with outstanding sensitivity, selectivity, recoverability and anti-interference ability. Moreover, experimental and DFT calculations suggest that the mechanism of fluorescence quenching can be attributed to the combined effect of energy competitive absorption and photo-induced electron transfer (PET) process between the complex and PGA.

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