Syntheses, X‐ray Crystal Structures, Photoluminescence Properties, Antimicrobial Activities and Hirshfeld Surface of Two New Cd(II) Azide/Thiocyanate Linked Coordination Polymers

Abstract

Abstract The reaction of cadmium(II) acetate salts with multisite coordinated compartmental Schiff base ligand N,N′‐Bis(3‐methoxysalicylidenimino)‐1,3‐diaminopropane (H 2 L 1 ) in presence of co‐lingand azido/thiocyanato afforded two new coordination polymers {[Cd 4 (N 3 ) 4 (L 1 ) 2 ]⋅H 2 O} n ( 1 ), [Cd 4 (SCN) 4 (L 1 ) 2 ] n ( 2 ). The obtained compounds, 1 and 2 are 1D and 2D coordination polymers respectively and they have been characterized by IR spectroscopy, UV‐vis spectroscopy, elemental analysis, and single‐crystal X‐ray diffraction. The variation in the extended forms of 1 and 2 is governed by the kind of co‐ligands utilized in the reaction. The complete structural study reveals that, in both cases the fully deprotonated ligand [L 1 ] 2− has utilized all six potential coordination sites to hold a pair of Cd(II) ions. Moreover, [N 3 ] − in 1 is coordinating to metal atom by both trans end‐to‐end (EE μ ‐1,3) and end‐on (EO or μ ‐1,1) mode and [SCN] − is showing only end‐to‐end (EE μ ‐1,3) coordination mode in 2 . The photo luminescent properties and antimicrobial activities of the compounds 1 and 2 were investigated and discussed in details. Upon irradiation with UV light Cd(II) polymeric compounds 1–2 exhibit deep blue emissions of 448−451 nm subjected to dimethyl sulfoxide solution due to π→π * intraligand fluorescence. Apart from, as a complementary revelation, intermolecular interactions with respect to percentages of hydrogen bonding in the crystal structures of two Cd(II) polymeric compounds were quantified by Hirshfeld surface and fingerprint plots analysis.