Designing of Novel Sm(III) Metal-Based Macrocyclic Complex Bearing NO Donor Moiety with Prominent Photoluminescence, Antimicrobial, and Antioxidant Activities.

Novel luminescent NO-donor Sm(III) macrocyclic complex i.e., [Sm(CHNO)].3NO; [(2Z,17Z)-7,10,13-trioxa-3,17-diaza-1(2,6)-pyridinacycloocta-decaphane-2,17-diene-2,18-diol] has been synthesized through the template synthetic route by using 1,13-diamino-4,7,10-trioxatridacane and pyridine-2,6-dicarboxylic acid ligand precursors in the presence of Sm(NO).6HO in (1:1:1) molar ratios. Elemental analysis, H NMR, C NMR, UV-Vis, FTIR, XRD, and mass spectrometry techniques have been utilized for the characterization of the synthesized complex. The crystalline nature of the complex is confirmed by the existence of sharp narrow peaks in the X-ray diffractogram. Optical property (Photoluminescence) is analyzed by PL-spectroscopy and results manifested that under 272 nm excitation wavelength, the complex exhibited three characteristic emission peaks at 563 nm, 602 nm, and 644 nm corresponded to the G→H, G→H, and G→H transitions respectively. This property leads the use of this reported complex as an optical active material which could be used as sensor for analysis and detection purpose such as cell or tissue imaging, solar cell, luminescent probe etc. Antimicrobial screening of the complex against E. coli, & S. aureus bacterial strains and Alternaria alternate & Fusarium solani fungal strains has also been performed to investigate their antimicrobial potential and revealed satisfactory results. Antioxidant potential of the complex has been checked by applying a DPPH free radical scavenging assay and the complex appeared with notable result. Cyclic voltammetry results indicated the electrochemical nature of the complex as prominent redox material for redox reactions.