Magnetism Regarding Coordination Clusters, Polymers and MOFs

A special issue of Magnetochemistry (ISSN 2312-7481).

Deadline for manuscript submissions: closed (31 May 2016) | Viewed by 15416

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Guest Editor
ICREA - Catalan Institution for Research and Advanced Studies & CSIC-ICMAB (Institut de Ciència de Materials de Barcelona), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
Interests: coordinaton chemistry; supramolecular chemistry; magnetism; fluorescence; multifunctional materials; surfaces; nano-structuration; microfluidics; molecular electronics

Special Issue Information

Dear Colleagues,

Magnetic Coordination clusters and polymers have leaded many subjects in the field of Magnetism since its earliest stages. More recently, magnetic MOFs have been included in this selected group due to their prospective and versatility. The success of these systems resides in the exhaustive effort of researchers devoted to their syntheses and deep understanding of final magneto-structural correlations resulting in new designs and improved magnetic properties. Development in such matters fosters additional areas, such as spintronics, molecular electronics, or quantum computing, requiring multidisciplinary work and opening the door to exciting applications in nanoscience and nanotechnology.

In Magnetochemistry, we are eager to participate in the dissemination of your recent novelties regarding magnetic properties of coordination clusters, polymers and/or MOFs. In this Special Issue, contributions of original research articles with emphasis on the synthesis and full characterizations based on the magnetic properties of the above systems are our primary goal.

Prof. Dr. Núria Aliaga-Alcalde
Guest Editor

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Keywords

  • Coordination compounds
  • Coordination magnetic polymers; magnetic MOFs
  • Multifunctional materials
  • Crystal engineering
  • Molecular magnetism
  • Molecule-based magnetism
  • Supramolecular chemistry

Published Papers (3 papers)

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Research

4306 KiB  
Article
A Family of Lanthanoid Dimers with Nitroanilato Bridges
by Samia Benmansour, Gustavo López-Martínez, Josep Canet-Ferrer and Carlos J. Gómez-García
Magnetochemistry 2016, 2(3), 32; https://doi.org/10.3390/magnetochemistry2030032 - 6 Sep 2016
Cited by 20 | Viewed by 4983
Abstract
The first complexes with lanthanoid ions and the nitroanilato ligand have been synthesized (nitroanilate dianion = [C6O4(NO2)2]2− = dianion of the 3,6-dinitro-2,5-dihydroxo-1,4-dibenzoquinone ligand). This family of dimers can be formulated as [Ln2(C [...] Read more.
The first complexes with lanthanoid ions and the nitroanilato ligand have been synthesized (nitroanilate dianion = [C6O4(NO2)2]2− = dianion of the 3,6-dinitro-2,5-dihydroxo-1,4-dibenzoquinone ligand). This family of dimers can be formulated as [Ln2(C6O4(NO2)2)3(H2O)10]·6H2O with Ln(III) = Sm (1), Gd (2), Tb (3), Dy (4), Ho (5), and Er (6). The X-ray structure of this family of isostructural complexes shows that they all present a dimeric structure where the Ln3+ ions are connected by a bis-bidentate nitroanilato ligand. Each metal completes its nonacoordination environment with a terminal bidentate nitroanilato ligand and five water molecules in a slightly distorted tri-capped trigonal prismatic geometry. The magnetic properties of this family show the expected contributions of the lanthanoid ions without any noticeable magnetic interaction through the nitroanilato ligand. The compounds present luminesce of the nitroanilato ligand superimposed with a weaker emission from the lanthanide ion in compound 5 (Ho). Full article
(This article belongs to the Special Issue Magnetism Regarding Coordination Clusters, Polymers and MOFs)
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11631 KiB  
Article
A Ni11 Coordination Cluster from the Use of the Di-2-Pyridyl Ketone/Acetate Ligand Combination: Synthetic, Structural and Magnetic Studies
by Constantinos G. Efthymiou, Ioannis Mylonas-Margaritis, Catherine P. Raptopoulou, Vassilis Psycharis, Albert Escuer, Constantina Papatriantafyllopoulou and Spyros P. Perlepes
Magnetochemistry 2016, 2(3), 30; https://doi.org/10.3390/magnetochemistry2030030 - 2 Aug 2016
Cited by 7 | Viewed by 4704
Abstract
The combined use of di-2-pyridyl ketone, (py)2CO, and acetates (MeCO2) in nickel(II) chemistry in H2O-MeCN under basic conditions (Et3N) afforded the coordination cluster [Ni11(OH)6(O2CMe)12{(py)2C(OH)(O)} [...] Read more.
The combined use of di-2-pyridyl ketone, (py)2CO, and acetates (MeCO2) in nickel(II) chemistry in H2O-MeCN under basic conditions (Et3N) afforded the coordination cluster [Ni11(OH)6(O2CMe)12{(py)2C(OH)(O)}4(H2O)2] (1) in 80% yield, where (py)2C(OH)(O) is the monoanion of the gem-diol form of (py)2CO. The complex contains a novel core topology. The core of 1 comprises a central non-linear {Ni32-OH)4}2+ subunit which is connected to two cubane {Ni4(OH)(μ3-OR)23-OR′)}4+ subunits [RO = (py)2C(OH)(O) and R′O = MeCO2] via the OH groups of the former which become μ3. The linkage of the Ni3 subunit to each Ni4 subunit is completed by two η112 and one η134 MeCO2 groups. Peripheral ligation is provided by two terminal monodentate MeCO2 and two terminal aqua ligands. The (py)2C(OH)(O) ligands adopt the η1133 coordination mode. From the twelve MeCO2 ligands, two are η1, two η134 and eight adopt the syn, syn η112 coordination mode; four of the latter bridge NiII centers at opposite faces of the cubane subunits. Complex 1 is the largest nickel(II)/(py)2CO-based ligand coordination cluster discovered to date and has an extremely rare nuclearity (Ni11) in the cluster chemistry of nickel(II). Variable-temperature, solid state dc susceptibility, and variable-field magnetization studies at low temperatures were carried out on complex 1. The study of the data reveals an S = 3 ground state, which has been well rationalized in terms of known magnetostructural correlations and the structural features of 1. An attempt has also been made to interpret the magnetic properties of the undecanuclear cluster in a quantitative manner using four exchange interaction parameters and the obtained J values are discussed. The role of H2O in the solvent medium that led to 1, and the high nickel(II) and acetate to di-2-pyridyl ketone reaction ratio employed for its preparation, on the nuclearity and identity of the cluster are critically analyzed. Full article
(This article belongs to the Special Issue Magnetism Regarding Coordination Clusters, Polymers and MOFs)
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3548 KiB  
Article
Comparative Magnetic Studies in the Solid State and Solution of Two Isostructural 1D Coordination Polymers Containing CoII/NiII-Curcuminoid Moieties
by Raúl Díaz-Torres, Melita Menelaou, Arántzazu González-Campo, Simon J. Teat, E. Carolina Sañudo, Mónica Soler and Núria Aliaga-Alcalde
Magnetochemistry 2016, 2(3), 29; https://doi.org/10.3390/magnetochemistry2030029 - 29 Jul 2016
Cited by 3 | Viewed by 5161
Abstract
Two novel 1D coordination chains containing the curcuminoid (CCMoid) ligand 9Accm have been characterized: [CoII(9Accm)2(4,4´-bpy)]n (1) and [NiII(9Accm)2(4,4´-bpy)]n (2). The two compounds were synthesized by solvothermal and microwave (MW) [...] Read more.
Two novel 1D coordination chains containing the curcuminoid (CCMoid) ligand 9Accm have been characterized: [CoII(9Accm)2(4,4´-bpy)]n (1) and [NiII(9Accm)2(4,4´-bpy)]n (2). The two compounds were synthesized by solvothermal and microwave (MW) assisted techniques, respectively, and crystals of both systems were directly obtained from the mother solutions. Crystal structures of 1 and 2 prove that both systems are isostructural, with the ligands in a trans configuration. The two chains have been magnetically characterized in solution by paramagnetic 1H NMR, where 1 displayed typical features from CoII systems, with spread out signals; meanwhile, 2 showed diamagnetic behaviour. The dissociation of the latest in solution and the stability of the “[Ni(9Accm)2]” unit were proved by further experiments in C5D5N. Additional UV-Vis absorption and fluorescence studies in solution were performed using exclusively 1. In the solid state χMT vs. T and M/NµB vs. H/T data were collected and fitted for 1 and 2; both systems display Ising plane anisotropy, with significant D values. System 1 presented slow relaxation of the magnetization, displaying frequency dependence in the in-phase/out-phase ac magnetic susceptibility data, when an external dc field of 0.2 T was applied. Finally, 1 was deposited on a HOPG (highly oriented pyrolytic graphite) substrate by spin-coating and analysed by AFM. Full article
(This article belongs to the Special Issue Magnetism Regarding Coordination Clusters, Polymers and MOFs)
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