0000000000335376
AUTHOR
Lorena Martínez
Structural and magnetic properties of polynuclear oximate copper complexes with different topologies
Abstract Two new copper(II) complexes containing the methyl(2-pyridyl)ketone oxime ligand (mpkoH) [Cu3(OH)(ClO4)2(mpko)3]·CH3OH (1) and [Cu(ClO4)(mpko)(mpkoH)]n (2) have been prepared from Cu(ClO4)2 and mpkoH in different metal-to-ligand molar ratios. In addition, the compound [Cu{(mpko)2BF2}(H2O)](BF4) (3) [(mpko)2BF2 is the fluoroboration product of the oxime] has been obtained when replacing Cu(ClO4)2 by Cu(BF4)2. Compound 1 is an isolated triangle with a {Cu3(µ3-OH)}5+ core, whereas 2 is a chain of CuII ions linked by anionic mpko− bridges. 1 exhibits strong antiferromagnetic competing interactions, as well as antisymmetric exchange. On the other hand, very weak ferromagnetic interactio…
Synthesis, characterization and magnetic properties of mixed-valence iron complexes with 2-pyridyl oximes
Two new mixed-valence iron complexes with 2-pyridyl oximes, [Fe(mpko)3Fe(H2O)2(NO3)](NO3)·2H2O (1) (mpko− = methyl(2-pyridyl)ketone oximate) and [{Fe(dpko)3}2Fe](ClO4)·4H2O (2) (dpko− = bis(2-pyridyl)ketone oximate), have been prepared by reaction of FeIII with mpkoH in methanol (1) and FeII with dpkoH in methanol/water (2). Dinuclear FeII(low-spin)FeIII(high-spin) and trinuclear FeII(low-spin)FeIII(high-spin)FeII(low-spin) cations are present in the crystal structure of 1 and 2, respectively. Intermolecular hydrogen bonds in 1 lead to weak antiferromagnetic interactions between pairs of neighboring FeIII centers, which allows observation of single-ion zero-field splitting effects.
Exchange coupling in a thiocyanato-bridged copper(II) chain: Computational approach to magnetostructural correlations
Abstract In this article we report the synthesis and magneto-structural characterization of two new copper(II) compounds with thiocyanato and methyl(2-pyridil) ketone oxime (mpkOH), namely [Cu(NCS)(mpkO)(mpkOH)] (1) and [Cu(µ-NCS)(NCS)(mpkOH)]n (2). Compound 1 is a mononuclear complex that crystallizes as discrete units. Conversely, compound 2 is a single equatorial-axial end-to-end thiocyanato bridged polymeric chain of Cu(II) with the oxime as a co-ligand. The coordination geometry around the Cu(II) centers is distorted square pyramidal for 1 and 2. The magnetic susceptibility data for 2 reveal weak intrachain antiferromagnetic coupling, with J value −0.74(3) cm−1 and g = 2.10(1). The ap…
CCDC 864757: Experimental Crystal Structure Determination
Related Article: Lorena Martínez, Carla Bazzicalupi, Antonio Bianchi, Francesc Lloret, Ricardo González, Carlos Kremer, Raúl Chiozzone|2017|Polyhedron|138|125|doi:10.1016/j.poly.2017.09.017
CCDC 1538260: Experimental Crystal Structure Determination
Related Article: Lorena Martínez, Carla Bazzicalupi, Antonio Bianchi, Francesc Lloret, Ricardo González, Carlos Kremer, Raúl Chiozzone|2017|Polyhedron|138|125|doi:10.1016/j.poly.2017.09.017
CCDC 864758: Experimental Crystal Structure Determination
Related Article: Lorena Martínez, Nicolás Veiga, Carla Bazzicalupi, Antonio Bianchi, Francesc Lloret, Carlos Kremer, Raúl Chiozzone|2021|Polyhedron|208|115406|doi:10.1016/j.poly.2021.115406
CCDC 1579781: Experimental Crystal Structure Determination
Related Article: Lorena Martínez, Livia Arizaga, Donatella Armentano, Francesc Lloret, Ricardo González, Carlos Kremer, Raúl Chiozzone|2018|J.Coord.Chem.|71|748|doi:10.1080/00958972.2018.1441405
CCDC 1579780: Experimental Crystal Structure Determination
Related Article: Lorena Martínez, Livia Arizaga, Donatella Armentano, Francesc Lloret, Ricardo González, Carlos Kremer, Raúl Chiozzone|2018|J.Coord.Chem.|71|748|doi:10.1080/00958972.2018.1441405
CCDC 2073463: Experimental Crystal Structure Determination
Related Article: Lorena Martínez, Nicolás Veiga, Carla Bazzicalupi, Antonio Bianchi, Francesc Lloret, Carlos Kremer, Raúl Chiozzone|2021|Polyhedron|208|115406|doi:10.1016/j.poly.2021.115406