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• Two novel Zn (II) coordination polymers have been successfully prepared and characterized. • An unprecedented topology with 4-nodal 3, 3, 5, 6-c framework. • Chem-sensors with excellent performance for the detection of Fe3+ ions or TC, high selectivity, extra sensitivity. Environmental issues are the great challenge that human beings are suffering from. Development in coordination polymers (CPs) provides a great platform for tracing hazardous substance by fluorescence detection. In this work, two novel Zn-CPs, namely [Zn(1,1′-bbi)(C 2 O 4)] n (1) and [Zn 3 (1,1′-bbi)(L) 2 (H 2 O)] n (2) (flexible 1,1′-bbi = 1,1′-(1,4-butanediyl)bis(imidazole), and H 3 L = 5-(2-carboxylphenoxy)isophthalic acid) have been synthesized under solvothermal conditions, and further characterized by IR spectra, elemental analyses, thermogravimetric (TG) analyses, powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. Complex 1 displays a sql topological framework; complex 2 shows an unprecedented 4-nodal (3,3,5,6)-c topological network with Point Schläfli symbol (4·5·6) 2 (42·52·62·73·9) 2 (42·52·64·7·84·9·10)(42·5) 2. CPs 1 – 2 possess good application prospect due to their high thermal, and chemical stability. The selective and sensitive fluorescence sensing of 1 – 2 have been investigated towards Fe3+ ions and tetracycline in detail. [ABSTRACT FROM AUTHOR]

Two novel Ni(II) CPs have been successfully synthesized, which could be good candidates for the photocatalytic degradation of organic dyes. • Synthesis of two different Ni(II) coordination polymers by introduction of carboxylic acid ligands. • Frame structure and photodegradation properties of the two complexes have been discussed. • The possible mechanism of photocatalytic degradation of dyes is explored. Two different novel coordination polymers were synthesized under hydrothermal conditions, namely {[Ni(bibp) 3 (H 2 O) 2 ]·2NO 3 ·0.5H 2 O} n (1), [NiL(bibp)] n (2) (H 2 L = 3,3′-azodibenzoic acid, bibp = 4,4′-bis(imidazolyl)biphenyl). Complex 2 is based on the introduction of carboxylic acid ligands on complex 1. These two polymers were characterized by single crystal X-ray diffraction, IR spectra, elemental analysis, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analysis. Single crystal X-ray diffraction analysis showed that complex 1 formed a 3D structure by weak force. Complex 2 possesses a uninodal 4-connected 3D (three-dimensional) sql topology framework with the point symbol (44·62). In addition, the photocatalytic degradation properties of the two complexes are investigated. Significantly, complex 1 is a good photocatalyst for the degradation of organic dyes (RhB/MO), complex 2 is a good photocatalyst for the degradation of organic dyes (MB). And the possible photodegradation mechanism was proposed and explored. [ABSTRACT FROM AUTHOR]