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[Display omitted] • A simplified approach for the fabrication of Co-CP nanoparticles has been reported. • Nanozyme-based colorimetric detection for Fe(II) ions is devised. • Sensing evidenced peroxide-reductase mimicking activity for Co-CP NPs. • The mechanism for the reported detection method is described using XPS and zeta analysis. • The practical utility is examined using real sample analysis. Nanozyme based sensors have evolved as an equable and productive approach for detecting obnoxious metal ions in water samples. A coherent and methodical outlook for nanozymatic sensors is provided in this work. A Co(II) based coordination polymer [Co(L) 1.5 (ac) 3 ] n named Co-CP, (L = N, N-(benzo-3,8-phenanthroline-2,7-diyl)diisonicotinamide and ac = CH 3 COO–) has been synthesized in this paper. Co(II) based coordination polymer nanoparticles (Co-CP NPs) constructed by using hand grinding process stimulates the nanozymatic action due to increased surface area and exposure of catalytically active sites. The fabricated Co-CP NPs were characterized using various sophisticated analytical techniques such as SCXRD, HRTEM, FESEM, PXRD etc. The NPs thus formed were about 27 nm in size and pertain porous sites. The Co-CP NPs exhibited peroxido-reductase mimicking activity for TMB(3,3′,5,5′-tetramethylbenzidine) oxidation. The catalytic action of the Co-CP NPs was utilized to detect Fe(II) ion selectively with a detection limit of 0.66 µM. The kinetics for the study were described using Michaelis-Menten curve. The K m and V max values for H 2 O 2 and Co-CP NPs were analyzed further to access the catalytic action of Co-CP NPs. XPS and zeta potential analysis were evidenced to elucidate the detection mechanism. The compatibility and practicality of the present method was also assured by actual water samples from different sources that showed good recovery percentage. Therefore, an economical, manageable and equable approach for using CPs as a sensing tool is provided hereby. [ABSTRACT FROM AUTHOR]

[Display omitted] • A new luminescent coordination polymer [CdL 2 (H 2 O) 4 ] (Cd-CP) was synthesized under solvothermal reactions and the structure was characterized and analyzed. • Cd-CP was further converted to Eu@Cd-CP by Eu3+ doping. • Fluorescent sensing experiment demonstrates that Eu@Cd-CP has higher sensitivity and sensitivity for Fe3+ than Cd-CP. • The detection mechanisms were studied by various spectroscopies. In this paper, a new cadmium fluorescent coordination polymer (Cd-CP) was synthesized under a solvothermal reaction of Cd(NO 3) 2 ·4H 2 O and 4-pyrimidine-5-ylbenzoic acid. In the Cd-CP, the adjacent [CdL 2 (H 2 O) 4 ] fragments are connected by π···π interactions between benzene rings and various H-bondings, further extending its structure to three-dimensional supermolecule network. Furthermore, Cd-CP was further converted to Eu@Cd-CP by Eu3+ doping, luminescent sensing experiments show that the Eu@Cd-CP exhibits highly sensitive and selective detection for Fe3+ with good recyclability, the quenching constant K sv reaches to 1.871 × 105 M−1 and correlation coefficient R 2 = 0.99393. The detection mechanisms of the fluorescent Eu@Cd-CP for Fe3+ were also further studied by various spectroscopies. [ABSTRACT FROM AUTHOR]