title: EPR interpretation, magnetism and biological study of a Cu(II) dinuclear complex assisted by a schiff base precursor.
abstract: A new Cu(II) dinuclear complex, Cu2L2(1) was afforded employing the potentially pentatentate Schiff base precursor H2L, a refluxed product of o-vanillin and diethylenetriamine in methanol. Complex 1 was systematically characterized by FTIR, UV-Vis, emission and EPR spectrometry. The single crystal X-ray diffraction analysis of 1 reveals that the copper atom exhibits a distorted square planar geometry, comprising two pairs of phenolato-O and imine-N donors from two different H2L ligands. The temperature dependent magnetic interpretation agrees with the existence of weak antiferromagnetic interactions between the bridging dinuclear Cu(II) ions. A considerable body of experimental evidence has been accumulated to elucidate the magneto-structural relationship in this dinuclear Cu(II) complex by DFT computation. Both the ligand and complex 1 exhibit anti-mycobacterial activity and considerable efficacy on M. tuberculosis H37Ra (ATCC 25177) and M. tuberculosis H37Rv (ATCC 25618) strains. The practical applicability of the ligand and complex 1 has been examined in living cells (African Monkey Vero Cells). The MTT assay proves the non-toxicity of the probe up to 100 mg mL-1. A new homometallic dinuclear Cu(II) complex is afforded with a tetradentate Schiff base precursor. EPR interpretation and temperature dependent magnetic studies show that complex 1 has weak antiferromagnetic coupling and DFT computation is governed to explain the magneto-structural correlation.
authors.affiliation: Department of Chemistry, Jadavpur University, Kolkata, 700032, India.|Institute of Chemistry, Academia Sinica, Nankang, Taipei, 115, Taiwan.
authors.forename: Kuheli
authors.initials: K
authors.lastname: Das
authors.affiliation: Department of Chemistry, Jadavpur University, Kolkata, 700032, India.
authors.forename: Chiranjit
authors.initials: C
authors.lastname: Patra
authors.affiliation: Department of Chemistry, Jadavpur University, Kolkata, 700032, India.
authors.forename: Chandana
authors.initials: C
authors.lastname: Sen
authors.affiliation: Institute of Chemistry, Academia Sinica, Nankang, Taipei, 115, Taiwan. amitd_ju@yahoo.co.in.
authors.forename: Amitabha
authors.initials: A
authors.lastname: Datta
authors.affiliation: Dipartimento di Chimica, Universita degli Studi di Parma, Viale delle Scienze, 17/A, 43124, Parma, Italy.
authors.forename: Chiara
authors.initials: C
authors.lastname: Massera
authors.affiliation: Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, 07100, Sassari, Italy.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Garribba
authors.affiliation: Departament de Química Inorgànica, Facultat de Química, Universitat de Barcelona, Martíi Franquès, 1-11, 08028, Barcelona, Catalunya, Spain.
authors.forename: Mohamed Salah
authors.initials: MS
authors.lastname: El Fallah
authors.affiliation: Institute of Chemistry, Academia Sinica, Nankang, Taipei, 115, Taiwan.
authors.forename: Belete B
authors.initials: BB
authors.lastname: Beyene
authors.affiliation: Institute of Chemistry, Academia Sinica, Nankang, Taipei, 115, Taiwan. chhung@gate.sinica.edu.tw.
authors.forename: Chen-Hsiung
authors.initials: CH
authors.lastname: Hung
authors.affiliation: Department of Chemistry, Jadavpur University, Kolkata, 700032, India. c_r_sinha@yahoo.com.
authors.forename: Chittaranjan
authors.initials: C
authors.lastname: Sinha
authors.affiliation: Department of Biology, Faculty of Sciences and Arts, University of Balikesir, Cagis Campus, 10145, Balıkesir, Turkey.
authors.forename: Tulin
authors.initials: T
authors.lastname: Askun
authors.affiliation: Department of Biology, Faculty of Sciences and Arts, University of Balikesir, Cagis Campus, 10145, Balıkesir, Turkey.
authors.forename: Pinar
authors.initials: P
authors.lastname: Celikboyun
authors.affiliation: CEISAM UMR CNRS 6230, Université de Nantes, 2 rue de la Houssinière, BP 92208, 44322, Nantes Cedex 3, France.
authors.forename: Daniel
authors.initials: D
authors.lastname: Escudero
authors.affiliation: Departament de Quimica, Universitat de les Illes Balears, Crta. de Valldemossa km 7.5, 07122, Palma de Mallorca (Baleares), Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Frontera
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D002522:Chlorocebus aethiops; D003300:Copper / Q000737:chemistry / Q000494:pharmacology*; D018360:Crystallography, X-Ray; D004305:Dose-Response Relationship, Drug; D004578:Electron Spin Resonance Spectroscopy; D060328:Magnetic Phenomena; D008826:Microbial Sensitivity Tests; D008958:Models, Molecular; D015394:Molecular Structure; D009169:Mycobacterium tuberculosis / Q000187:drug effects*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D011789:Quantum Theory; D012545:Schiff Bases / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013696:Temperature; D014709:Vero Cells
chemical_list: D000900:Anti-Bacterial Agents; D009942:Organometallic Compounds; D012545:Schiff Bases; D003300:Copper
keywords: Anti-mycobacterial; Cu(II) complex; Cytotoxicity; Magnetism; Spectra