Two new Ag(I) coordination polymers, namely, [Ag2(dmt)2(tph)]n (1), [Ag2(dmt)2(oxalate)]n (2), and a discrete neutral complex [Ag2(dmt)4(SO4)].2(dmt).2(H2O) (3) (where dmt=2,4‐diamino‐6‐methyl‐1,3,5‐triazine, ox=oxalate anion and H2tph=terephthalic acid) were synthesized and characterized using elemental analysis, IR, UV–vis and fluorescence spectroscopy. The solid‐state structures of complexes 1–3 were determined using single crystal X‐ray crystallography. Compounds 1 and 2 are 1D and 3D coordination polymers, respectively, with the packing reinforced by weak interactions such as H‐bonds and π‐π stacking. The most intriguing aspect of the crystal structure of 3 is a pseudo hexagonal arrangement of six dmt, connected by pairs of N−H⋅⋅⋅N hydrogen bonds, around a sulfate anion. The band gap energies of the coordination polymers were determined. All the complexes were found to be photo‐catalytically active and complex 1 displays the higher catalytic activity toward the photo degradation of methylene blue (MB) in water. The higher content of aromatic moieties in 1 plays a significant role in effective charge separation and transport to make it the best catalyst in the series.

1‐aminopyrene and 2,4‐dihydroxy benzaldehyde derived pyrene based chemosensor was obtained by single step synthesis. The sensor is highly selective and sensitive towards Cu2+ and S2‐ ions. Sensitivity of the sensor towards Cu2+ was assessed by UV/Visible absorption and emission spectroscopy while the same for the S2‐ was colorimetrically assessed. Static quenching mechanism for Cu2+ was established by time‐resolved fluorescence spectroscopy. Stoichiometry of the sensor with Cu2+ and S2‐ ions were found to be 2:2 and 1:1 with the corresponding binding constants as 5.65 ×105 M‐1 and 3.08 ×104 M‐1. The lower limit of detection of Cu2+ and S2‐ by 1 is 0.503 and 10 μM respectively projecting the sensor as a potential agent for applications in real samples.

Three new Ag(I) coordination polymers, namely, [Ag 3 (pyp) 3 (H 2 O) 2 ](bpydc)1.5(H 2 O) 6 (1), Ag 2 (dpe) 2 (phdac)](H 2 O) 5.4 (2), and [Ag 2 (azbpy) 3 (H 2 O) 2 ].(dga)(H 2 O) 5 (3) (where pyp = 1,3-bis(4-pyridylpropane), H 2 bpydc = 2,2'-bipyridine-5,5'-dicarboxylic acid, dpe = 1,2-di(4-pyridyl)ethylene, H 2 phdac = 1,4-phenylenediacetic acid, azpy = 4,4'-azobispyridine and H 2 dga = diglycolic acid) were synthesized and characterized using elemental analysis, IR, UV-vis, fluorescence spectroscopy, and single crystal X-ray diffraction. The most interesting aspect of these coordination polymers (CPs) in the solid state is represented by the number of lattice water molecules that, along with carboxylate ligands, play a crucial role in network formation through H-bonds to attain a 3D structure. The band gap energies of the CPs were calculated. Among the compounds studied CP 2 was proved to be the most efficient photocatalyst for the degradation of noxious organic dye methylene blue (MB) and in addition tendered better antibacterial activity. Finally, all three CPs showed to be hemocompatible.

Two Ag(I) coordination polymers (CPs), namely [Ag(bpetan)(NO3)]n (CP1) and {[Ag(bpetan)]2(iph).8H2O}n (CP2) [where bpetan=1,2‐bis(4‐pyridyl)ethane, H2iph= isophthalic acid] were synthesized and characterized using elemental analysis, IR, UV‐Vis, fluorescence spectroscopy, and single crystal X‐ray diffraction. Both the CPs crystallize in triclinic system and the crystal structures comprise [Ag(bpetan)]nn+ polymers that are linked by nitrate ions to give rise to a corrugated 2D infinite rectangular net in CP1. On the other hand, isophthalate ions in 2 do not participate in coordination and together with lattice water molecules are encapsulated between the [Ag(bpetan)]nn+ chains. A structural comparison of CP1 and CP2 was done with compounds of same stoichiometry but crystallizing in different space groups. The band gap energies of CP1 and CP2 were calculated to assess their photocatalytic activity, and the latter was found to act as a more efficient photocatalyst to degrade the methylene blue dye. In addition CP2 offers a better anti‐bacterial, cytotoxicity and hemolytic activity than CP1.

Two coordination polymers, {[Ag(bpp)] 6 (tma) 2 .28(H 2 O)} n (1) and {[Ag 4 (bpp) 4 (bda) 2 ].12(H 2 O)} n (2) (where bpp = 1,3-bis(4-pyridyl) propane, H 3 tma = trimesic acid, H 2 bda = 1,3-benzenediacetic acid), have been synthesized and structurally characterized. In both the compounds the metal ions are connected by bridging dipyridine ligands to form cationic undulated 1D coordination polymers [Ag(bpp)] n counterbalanced by the organic anions. However, in 2 the bda anions participate in metal coordination connecting the polymers in pair. It is worth of note that six and four crystallographic independent Ag(bpp) units are present in the unit cell of 1 and 2, respectively, a feature likely affected by the conformational freedom of bpp ligands, although experimental conditions, solvent and packing effect cannot be ruled out. In both the compounds the crystal packing shows an extensive network of H-bonds realized by the numerous water molecules and the anionic organic species. The band gap energies of 1 and 2 were calculated in order to explain their activity towards the degradation of toxic methylene blue dye, and compound 1 was found to be more efficient for this purpose.