Three new coordination polymers (CPs) of coordinated isoniazid (INH) to Zn(II) with succinic acid (H 2 succ), fumaric acid (H 2 fum), and terephthalic acid (H 2 bdc) as organic linker, [Zn(INH)(succ)] n (1), [Zn(INH)(fum)] n (2), and [Zn(INH)(bdc)] n (3), respectively, have been characterized. The structure determination by the single crystal X-ray diffraction technique shows a ZnN 2 O 4 distorted octahedral geometry, and the 1D chain is constituted via the INH and carboxylate coordination along with the hydrogen bonding (N−H•••O) which comprises a 2D structure. The CPs, 1 and 2, are isostructural and fabricate supramolecular networks by inclined intercatenation of two 2D layers, while 3 shows parallel intercatenation. The electrical conductivity and Schottky barrier diode behavior have been established by the charge transport mechanism of the compounds at the quasi-Fermi level state. The analysis indicates that the compound 1 has the highest mobility (2.53 × 10 −10 m 2 V −1 s −1 ) than 2 (1.86 × 10 −10 m 2 V −1 s −1 ) and 3 (1.89 × 10 −10 m 2 V −1 s −1 ) and the highest electrical conductivity (2.26 × 10 −4 S m −1 ) than the others (1.12 × 10 −4 S m −1 (2) and 1.25 × 10 −4 S m −1 (3)). DFT computation of the structural motif of CPs has calculated the band gap (ΔE: 3.93 eV (1), 4.45 eV (2), 4.26 eV (3)), which supports the progression of conductivity.

A new Cu(ii)-based 1D coordination polymer [Cu(fum)(4-phpy)2(H2O)], (1) (H2fum = fumaric acid and 4-phpy = 4-phenyl pyridine) exhibits electrical conductivity in the semiconductor region and behaves as Schottky diode.

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Thioether Schiff base (H2L), a nontoxic Zn2+-sensor (LOD, 0.050 μM) has shown selective ON–OFF emission following INHIBIT logic circuit with H2PO4−and useful agent for the identification of Zn2+and H2PO4−in intracellular fluid in living cells.