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Structure, magnetic properties and nuclease activity of pyridine-2-carbaldehyde thiosemicarbazonecopper(II) complexes |
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| Authors: | Gómez-Saiz Patricia Gil-García Rubén Maestro Miguel A Pizarro José Luis Arriortua María Isabel Lezama Luis Rojo Teófilo González-Alvarez Marta Borrás Joaquín García-Tojal Javier |
| Institution: | a Departamento de Química, Universidad de Burgos, Misael Bañuelos s/n, 09001 Burgos, Spain b Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain c Departamento de Mineralogía y Petrología, Universidad del País Vasco, Aptdo. 644, 48080 Bilbao, Spain d Departamento de Química Inorgánica, Universidad del País Vasco, Aptdo. 644, 48080 Bilbao, Spain e Departamento de Química Inorgánica, Facultad de Farmacia, Universidad de Valencia, Vicent Andres Estelles s/n, 46100 Burjassot (Valencia), Spain |
| Abstract: | New complexes of formulae Cu(HL2)(H2O)(NO3)](NO3) (1), {Cu(L1)(tfa)}2] (2), {Cu(L1)}2(pz)](ClO4)2 (3) and {{Cu(L1)}2(dca)](ClO4)}n (4), where HL1 = pyridine-2-carbaldehyde thiosemicarbazone, HL2 = pyridine-2-carbaldehyde 4N-methylthiosemicarbazone, Htfa = trifluoroacetic acid (CF3COOH), pz = pyrazine (C4H4N2) and dca = dicyanamide N(CN)2]−, have been synthesized and characterized. The crystal structures of these compounds are built up of monomers (1), dinuclear entities with the metal centers bridged through the non-thiosemicarbazone coligand (2 and 3) and 1D chains of dimers (4). In all the cases, square-pyramidal copper(II) ions are present, except for the square-planar ones in 3. Magnetic measurements show antiferromagnetic couplings in 2, 3 and 4. The susceptibility data were fitted by the Bleaney-Bowers’ equation for copper(II) dimers derived from H = -2JS1S2 being the obtained J/k values −4.8, −4.3 and −5.1 K for compounds 2-4, respectively. The magnetic susceptibility of the already known {Cu(HL1)(tfa)}2](tfa)2 compound has been also measured for the first time. The J/k value is -0.3 K, lower than that in 2. The nuclease activity of 3 and 4 has been analyzed. |
| Keywords: | Copper Thiosemicarbazone complexes Structure elucidation Magnetic properties Nuclease activity |
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