Polymorphism and magnetic properties in thiosemicarbazonecopper(II)-sulfate compounds

• Published in: Polyhedron Vol. 54; pp. 243 - 251
• Main Authors: Gil-García, Rubén, Gómez-Saiz, Patricia, Díez-Gómez, Virginia, Donnadieu, Bruno, Insausti, Maite, Lezama, Luis, García-Tojal, Javier
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 30.04.2013
• Subjects: Copper; Magnetism; Structure; Sulfate; Thiosemicarbazone complexes; Thiosemicarbazone complexes; Magnetism; Sulfate; Copper; Structure
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2013.02.061

Polymorphism in two thiosemicarbazonecopper(II) derivatives gives rise to both, dimeric entities and 1-D chains. Studies extended to analogous thiosemicarbazonecopper(II)-sulfate compounds show the presence of ferromagnetic and antiferromagnetic interactions. New thiosemicarbazonecopper(II) compounds with formulae [{CuL(H2O)}{CuL(SO4)}]·H2O 1, [{CuL(H2O)}{CuL(SO4)}]n·nH2O 2 and [Cu(HL′)(SO4)(H2O)]·0.75H2O 3, (HL=pyridine-2-carbaldehyde thiosemicarbazone, and HL′=pyridine-2-carbaldehyde 4N-methylthiosemicarbazone) have been synthesized and characterized by elemental analysis, FAB+ mass spectrometry, infrared spectroscopy, electron paramagnetic resonance and thermal analysis. In addition, the preparation of the previously published [{Cu(L′)(H2O)}{Cu(L′)(SO4)}]·4H2O 4 compound has been optimized. The crystal structures of 1, 2 and 3 have been solved using X-ray diffraction measurements. The compound 3 is formed by monomeric entities, while 1 and 2 are structural isomers and give rise to dinuclear and 1D polymorphs, respectively. Magnetic measurements have been carried out on 1, 2, 4 and [{Cu(HL)(SO4)}2] 5, being the latter prepared by a different method to that already reported. The magnetic properties are discussed and compared with those of analogous thiosemicarbazonecopper(II) complexes.