Phenanthridine-containing complexes of mercury(II) and cadmium(II): synthesis, characterization, crystal structure determination, and luminescence properties

• Published in: Journal of the Iranian Chemical Society 2021-06, Vol.18 (6), p.1343-1353
• Main Authors: Hosseinpour, Fatemeh, Alizadeh, Robabeh, Amani, Vahid, Khavasi, Hamid Reza
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Biochemistry; Chemical analysis; Chemical synthesis; Chemistry; Chemistry and Materials Science; Coordination compounds; Crystal structure; Crystals; Emission analysis; Infrared analysis; Inorganic Chemistry; Ligands; Luminescence; Mercury (metal); Mercury compounds; NMR; Nuclear magnetic resonance; Optical properties; Organic Chemistry; Original Paper; Photoluminescence; Physical Chemistry; Single crystals; Structural analysis; X ray analysis
• ISSN: 1735-207X; 1735-2428
• DOI: 10.1007/s13738-020-02116-5

Two new Hg(II), {[Hg(phend) 2 Cl 2 ].(0.5 phend) ( 1 ) and [Hg(phend) 2 Br 2 ].(0.5 phend) ( 2 )} and a new Cd(II) {[CdI 2 (phend) 2 ] ( 3 )} complexes, containing phenanthridine (phend) ligand, have been synthesized from the reaction of HgCl 2 ( 1 ), HgBr 2 ( 2 ), and CdI 2 ( 3 ) with phend, respectively. The complexes were thoroughly characterized by elemental analysis, FT-IR, UV, NMR, and emission spectroscopies. Moreover, single-crystal X-ray diffraction studies were undertaken to examine the coordination geometry of complexes 1 - 3 in the solid-state. According to X-ray analysis, the complexes 1 ( τ 4  = 0.77) and 2 ( τ 4  = 0.74) exhibit distorted tetrahedral geometries and 3 ( τ 4  = 0.90) shows slightly distorted tetrahedral geometry. So, complexes 1 and 2 have similar structures. However, the emission maximum of complex 1 is stronger than 2 , which indicates that the different coordinated counter anions play a significant role in determining the photoluminescence properties of the complexes. Meanwhile, all complexes 1 - 3 have stronger emissions than free phend ligand in the DMSO solution.