Related Experiment Video
Updated: Jan 18, 2026

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
Published on: March 9, 2017
Alkynyl-Iminopyridine-Based Trinuclear Ni(II), Zn(II), Cd(II), and Cu(II) Complexes: Structural, Electrochemical,
Namita H Naiknaware1, Ajit H Deshmukh1, Ashwini S Patil1
1Department of Chemistry, Shivaji University, Kolhapur, MS, 416 004, India.
Abstract:
A new series of alkynyl-functionalized trinuclear metal complexes, with the general formula [M₃(L1/L2)(Cl)₆] (M = Ni(II), Zn(II), Cd(II), Cu(II)), were synthesized using alkynyl-functionalized iminopyridine ligands L1 and L2. The complexes were characterized by various techniques, including FTIR, NMR, ESI-MS, UV-Vis, ESR, TGA, PXRD, and SEM. All synthesized complexes exhibit absorption in the visible region, primarily attributed to metal-to-ligand charge transfer (MLCT) and intra-ligand charge transfer (ILCT) transitions. Electrochemical investigations of the Ni(II) and Cu(II) analogues reveal quasireversible redox behavior. EPR spectral analysis of the Cu(II) complexes indicates a significant degree of covalency in the metal-ligand interactions. All complexes emit red luminescence at room temperature. The second harmonic generation (SHG) efficiency, evaluated via the Kurtz powder technique, highlights the potential of these complexes as promising candidates for nonlinear optical (NLO) applications.
Related Concept Videos
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
Photoluminescence: Applications
Valence Bond Theory
Variables Affecting Phosphorescence and Fluorescence
Photoluminescence: Fluorescence and Phosphorescence
A pair of electrons in a...
Coordination Number and Geometry

