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A new series of N-heterocyclic carbene (NHC) ligand precursors (1 and 2) with their [Ag(I)(NHC) 2 ]PF 6 complexes (3 and 4) and [ClAu(I)(NHC)] complexes (5 and 6) are reported. Complexes 5 and 6 were synthesized via transmetalation reaction using either 3 or 4 and AuCl(SMe 2 ) as reactants, respectively. All the synthesized compounds were fully characterized using elemental analyses and Fourier transform infrared, 1 H NMR and 13 C NMR spectroscopies. In the crystal structures of 3, 5 and 6, the Ag(I) and Au(I) ions are in a linear geometry. The entire structure of 3 is stabilized by significant π-π interactions, while the structures of 5 and 6 are stabilized with the presence of aurophilic interactions between the adjacent Au(I) ions as well as CH-π or π-π interactions. From photoluminescence studies, complexes 5 and 6 show dual-emission characteristics. The higher-energy fluorescence originates from 1 XLCT mixed with 1 MLCT, while the lower-energy phosphorescence is ascribed to 3 XLCT and 3 MLCT with small contribution of 3 ILCT, as evidenced by density functional theory (DFT) and time-dependent DFT calculations of the modelled molecules.

The schiff base ligand and its complexes of divalent metal ions of Ni (II) and Cu (II) were synthesized. The ligand and the complexes were characterized by elemental analysis, potentiometry, molar conductance, melting point or decomposition temperatures and infrared analyses. The elemental analysis data show the formation of 1:2 metal complexes were screened for antibacterial activity against Escherichia coli and Staphylococcus aureus, and antifungal activity against Aspergillums niger and Candida albican, using discs diffusion method. It has been found that the ligand and the comple against microorganisms. The complexes show higher activity than the free Schiff base ligand. The molar conductance of the complexes measured is low, indicating their non potentiometric studies of the complex compounds revealed 1:

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