Synthesis, structure, spectroscopic and electrochemical properties of bis(histamine-saccharinate) copper(II) complex

✍ Scribed by İclal Bulut; İbrahim Uçar; Bünyamin Karabulut; Ahmet Bulut

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 520 KB
• Volume: 834-836
• Category: Article
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2006.10.035

✦ Synopsis

Crystal structure of [Cu(hsm) 2 (sac) 2 ] (hsm is histamine and sac is saccharinate) complex has been determined by X-ray diffraction analyses and its magnetic environment has been identified by electron paramagnetic resonance (EPR) technique. The title complex crystallizes in the monoclinic system, space group P 21/c with a = 7.4282(4), b = 22.5034( 16), c = 8.3300(5) A ˚, b = 106.227(4)°, V = 1336.98(14) A ˚3, and Z = 2. The structure consist of discrete [Cu(hsm) 2 (sac) 2 ] molecules in which the copper ion is centrosymmetrically coordinated by two histamine ligands forming an equatorial plane [Cu-N hsm = 2.024(2) and Cu-N hsm = 2.0338(18) A ˚]. Two N atoms from the saccharinate ligands coordinate on the elongated axial positions with Cu-N sac being 2.609(5) A ˚. The complex is also characterized by spectroscopic (IR, UV/Vis) and thermal (TG, and TDA) methods. The cyclic voltammogram of the title complex investigated in DMSO (dimethylsulfoxide) solution exhibits only metal centred electroactivity in the potential range -1.25-1.5 V versus Ag/AgCl reference electrode. The molecular orbital bond coefficients of Cu(II) ion in d 9 state is also calculated by using EPR and optical absorption parameters.