A5081119203- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Metal complexes synthesis and properties
- Metal-Organic Frameworks: Synthesis and Applications
- Crystallography and molecular interactions
- Metal-Catalyzed Oxygenation Mechanisms
- Organic and Molecular Conductors Research
- Thermal and Kinetic Analysis
- Inorganic Chemistry and Materials
- Electron Spin Resonance Studies
- Inorganic and Organometallic Chemistry
- Synthesis and Characterization of Heterocyclic Compounds
- Chemical Thermodynamics and Molecular Structure
- Porphyrin and Phthalocyanine Chemistry
- Organometallic Complex Synthesis and Catalysis
- Polyoxometalates: Synthesis and Applications
- Organometallic Compounds Synthesis and Characterization
- Advanced NMR Techniques and Applications
- Energetic Materials and Combustion
- Crystal structures of chemical compounds
- Nanocluster Synthesis and Applications
- Synthesis of Tetrazole Derivatives
- Metalloenzymes and iron-sulfur proteins
Universitat de Barcelona
2016-2025
Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona
2016-2025
FC Barcelona
2015-2020
Brock University
2014
University of Patras
2005-2013
University of Graz
2012
Instituto de Ciencia de Materiales de Sevilla
2005-2008
National Centre of Scientific Research "Demokritos"
2005-2008
University of Florida
2008
National and Kapodistrian University of Athens
2005-2007
Abstract The synthesis of transition metal spin‐clusters has become an important sub‐discipline coordination chemistry, especially since the discovery single‐molecule magnets (SMMs) in early nineties. In this context, complexes with high spin‐numbers and large anisotropy are particularly desired. use azide ligand to act as a bridge magnetic coupler within cages paramagnetic ions increasingly common field, during last five years, mainly because versatility ligand, which is capable bridging...
Clusters of magnets: The first examples manganese single-molecule magnets (SMMs) consisting exclusively trivalent metal centers are reported. These hexanuclear clusters containing the [MnIII6(μ3-O)2(μ2-OR)2]12+ core (see picture, Mn yellow, O red) and have an S=4 ground state. Variation oxygen-containing ligands allows a potentially large family SMMs to be prepared. Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2004/z51079_s.pdf or...
μ4 end-on coordination (through the N atom) of pseudohalogeno ligands X−=N3− and NCO− has been observed in isostructural nonanuclear CoII cages with general formula [Co9{(2-C5H4N)2CO2}4(O2CMe)8X2] (see picture); this mode is imposed by trapping anions X− into cavities formed inside cage. The change modulates magnetic behavior cage from antiferromagnetic coupling to a ferrimagnetic high-spin ground state.
Tridentate/tetradentate Schiff base ligands L(1) and L(2), derived from the condensation of o-vanillin or pyridine-2-aldehyde with N,N-dimethylethylenediammine, react nickel acetate perchlorate salt azide, cyanate, thiocyanate to give rise a series dinuclear complexes formulas [Ni(L(1))(micro(1,1)-N(3))Ni(L(1))(N(3))(OH(2))].H(2)O (1), [[Ni(L(1))(micro(1,1)-NCS)Ni(L(1))(NCS)(OH(2))][Ni(L(1))(micro-CH(3)COO)Ni(L(1))( NCS) (OH(2))]] (2) [[2A][2B]],...
Reaction of sodium azide with manganese(II) and pyridine derivatives such as 2-bzpy, 3-bzpy, 3,5lut (2-benzoylpyridine, 3-benzoylpyridine, 3,5-dimethylpyridine, respectively) led to the one-dimensional systems cis-[Mn(2-bzpy)(N3)2]n (1), trans-[Mn(3-Bzpy)2(N3)2]n (2), cis-[Mn(3,5lut)2(N3)2]n (3). Compound 1 crystallizes in P21/n group: a = 14.413(4) Å, b 16.157(4) c 18.478(5) Z 12. 2 C2/c 14.179(5) 9.698(4) 34.351(12) 8. 3 13.552(6) 7.730(3) 16.554(6) 4. Structural determination shows chain...
The reaction of di-2-pyridyl ketone, (2-py)2CO, with Ni(O2CMe)2·4H2O yields the cage [Ni9(OH)2(O2CMe)8{(2-py) 2CO2}4], which reacts further N3− ions to give structurally similar cluster [Ni9(N3)2(O2CMe)8 {(2-py)2CO2}4] containing extremely rare η1,μ4-N3− groups; magnetic studies reveal that spin ground state latter is nine times former.
The reaction of manganese(II) and pyridine derivatives such as 3-methylpyridine (3-Mepy) 3,4-dimethylpyridine (3,4-Dmepy) led to the new one-dimensional systems trans-[Mn(3-Mepy)2(N3)2]n (1) trans-[Mn(3,4-Dmepy)2(N3)2]n (2). Compound 1 crystallizes in monoclinic system, space group P2(1)/n, a = 11.201(3) A, b 14.499(4) c 14.308(4) Z 6, compound 2 triclinic P1, 11.502(4) 14.246(5) 16.200(8) 6. two compounds show same general arrangement double azido bridges between neighboring manganese atoms...
Three compounds with formula [Mn(L)(2)(N(3))(2)](n)(), in which L is 4-acpy = 4-acetylpyridine (1), Etinc ethyl isonicotinate (2), and py pyridine (3), have been studied from the magnetic point of view. The new compound [Mn(L)(2)(N(3))(2)](n)() (2) crystallizes monoclinic system, space group P2(1)/a (No. 14), [C(16)H(18)MnN(8)O(4)], a 15.176(5) Å, b 9.060(3) c 15.760(6) beta 111.62(3) degrees, Z 4. Compounds 1 2 are two-dimensional systems, whereas 3 3-D compound. Compound shows...
Two new polymeric manganese-azido systems with formula Cs(n)-[[Mn(N3)3]n] (1) and [[N(C2H5)4]n][[Mn2-(N3)5(H2O)]n] (2) were synthesised structurally characterised. Compound 1 crystallises in the P2(1)/n group consists of a three-dimensional system end-to-end end-on azido bridges caesium atoms holes net. Magnetically, compound is rare case network alternate ferro-antiferromagnetic interactions. 2 P1 double chains manganese bridged by and, exceptional, (mu-1,1,1)-azido bridges. shows net...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo new .mu.-azido nickel(II) uniform chains: syntheses, structures, and magneto-structural correlationsAlbert Escuer, Ramon Vicente, Joan Ribas, M. Salah El Fallah, Xavier Solans, Font-BardiaCite this: Inorg. Chem. 1993, 32, 17, 3727–3732Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrans-[Ni(333-tet)(.mu.-N3)]n(ClO4)n and cis-[Ni(333-tet)(.mu.-(N3)]n(PF6)n: Two Novel Kinds of Structural Nickel(II) Chains with a Single Azido Bridge. Magnetic Behavior an Alternating S = 1 chain .alpha. 0.46Albert Escuer, Ramon Vicente, Joan Ribas, M. Salah El Fallah, Xavier Solans, Merce Font-BardiaCite this: Inorg. Chem. 1994, 33, 9, 1842–1847Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue...
Complicated, alternating ferromagnetic/antiferromagnetic interactions in homometallic, one-dimensional MnII-azido systems permit an unprecedented ferrimagnetic response. One new kind of ferrimagnet with a surprising behavior system ground state ST = 0 (see picture) was observed and related to the structural parameters.
The first {Mn31} cluster (1) has been prepared from carboxylate ions and the chelating/bridging ligand α-methyl-2-pyridine-methanol. Compound 1 possesses a unique nanosized structural topology with one of largest energy barriers reported to-date for high-nuclearity 3d-metal clusters. Single-crystal magnetic hysteresis studies reveal presence loops below 5 K, highest temperatures which molecular observed 3d-based SMMs.
The use of N-salicylidene-o-aminophenol (H2saph) in 4f-metal chemistry has led to the isolation seven new isostructural lanthanide(iii) [Ln(III)] complexes. More specifically Ln(NO3)3·xH2O/H2saph/Et3N (1 : 1 1) reaction mixtures DMF/MeCN gave complexes [Ln2(NO3)2(saph)2(DMF)4] (Ln = Sm (); Eu Gd Tb Dy Ho Er ()) good yields (∼65%). structures isomorphous and were solved by single-crystal X-ray crystallography; other are proposed be with based on elemental analyses, IR spectra powder XRD...
Two new one-dimensional compounds, trans-[Mn(4-bzpy)2(N(CN)2)2]n (1) and cis-[Mn(bpy)(N(CN)2)2]n (2), have been synthesized studied from a magnetic point of view (4-bzpy = 4-benzoylpyridine; bpy 2,2'-bipyridyl). The crystal structures 1 2 solved. Compound crystallizes in the monoclinic system, P2(1)/n group, 6.374(2) A, b 7.584(2) c 26.766(5) beta 91.87 degrees, Z 2, whereas compound C2/c 6.707(2) 17.188(5) 13.096(5) 90.54 4. two compounds consist chains with double mu 1,5-dicyanamide...
The X-ray structure of the &mgr;-carboxylate-&mgr;(1,1)-azido-bridged compound {[Cu(Hpht)(N(3))].H(2)O}(n)() has been determined (Hpht = hydrogen phthalate). Crystal data: formula C(8)H(7)CuN(3)O(5), monoclinic, P2(1)/m (No. 11), a 7.383(3) Å, b 6.568(4) c 10.659(4) beta 93.38(3) degrees, Z 2. is found to be system formed by chains copper atoms bridged simultaneously syn-syn carboxylato and end-on azido bridges. are linked second bridge, giving 2-D compound. Magnetic measurements indicate...
Three new polynuclear copper(II) complexes, derived from the end-on azido bridging ligand and pyridine derivatives, have been synthesized, their crystal structures determined by X-ray diffraction methods; they are dinuclear compounds [Cu2(mu 1,1-N3)2(4-Etpy)4(mu-NO3)2] (1), 1,1-N3)2(3-ampy)4(mu-NO3)2]. C2H5OH (2), trinuclear [Cu3(mu 1,1-N3)4(N3)2(Meinic)2(DMF)2] (3). 4-Etpy is 4-ethylpyridine, 3-ampy 3-aminopyridine, Meinic methylisonicotinate. Compound 1, C28H36Cu2N12O6, crystallized in...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew dinuclear penta- and hexacoordinated nickel(II) complexes with .mu.-azido bridges. Crystal structures of ferromagnetically coupled (.mu.-N3)2[Ni(Me3[12]N3)]2(ClO4)2.cntdot.2H2O (.mu.-N3)2[Ni(232-N4)]2(ClO4)2Ramon Vicente, Albert Escuer, Joan Ribas, M. Salah el Fallah, Xavier Solans, Merce Font-BardiaCite this: Inorg. Chem. 1993, 32, 10, 1920–1924Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue...
Two new compounds in the series of general formula [Mn(L)(2)(N(3))(2)](n)() which L = 4-cyanopyridine (1) or 3-acetylpyridine (2) have been obtained and structurally magnetically characterized. Both crystallize monoclinic system, space group P2(1)/a, [C(12)H(8)MnN(10)] with a 13.286(4) Å, b 8.340(3) c 13.579(4) beta 90.55(2) degrees, Z 4 for compound 1 P2(1)/c, [C(14)H(14)MnN(8)O(2)] 11.843(4) 9.550(3) 14.998(5) 105.99(3) 2. The two show similar arrangement alternating end-to-end end-on...
The X-ray structures of the two monodimensional systems formula [Mn(L)2(N3)2]n in which L = 3-ethylpyridine (1) or 2-hydroxypyridine (2) have been determined. Crystal data: 1, C14H18MnN8, monoclinic P21/n, a 10.210(5) Å, b 15.460(6) c 10.880(4) β 95.86(3)°, Z 4; 2, C10H10MnN8O2, triclinic P1̄, 5.218(2) 6.841(3) 9.469(4) α 79.30(4)°, 87.85(4)°, γ 75.85(4)°, 1. compounds consist chains manganese atoms bridged by double end-to-end azido bridges. 1 consists structurally and magnetically...
Three new dinuclear copper(II) complexes, derived from end-to-end and end-on azido bridging ligands triamine derivatives, have been synthesized their crystal structures determined by X-ray diffraction methods. These are the compounds, [Cu2(μ1,3-N3)2(Et3dien)2](ClO4)2 (1) [Cu2(μ1,3-N3)2(Medpt)2](ClO4)2 (2), compound [Cu2(μ1,1-N3)2(Medien)2](ClO4)2 (3) (Et3dien is triethyldiethylenetriamine, Medpt methyldipropylenetriamine Medien methyldiethylenetriamine). The [Cu(μ-N3)2Cu]2+ cores...
The reactions of M(O2CCH3)2·4H2O (M= Mn, Co) with di-2-pyridyl ketone, (py)2CO, and NaN3 in CH3OH or CH3OH/H2O allow isolation the tetranuclear compounds [Mn4(μ1,1-N3)2(N3)2{(py)2C(OH)O}2{(py)2C(OCH3)O}2] (1) [Co4(μ1,1-N3)2(N3)2{(py)2C(OH)O}2{(py)2C(OCH3)O}2]·2H2O (2). X-ray diffraction analysis reveals defective double-cubane tetrameric entities which MnII CoII atoms are linked by μ1,1-N3 bridges two kinds O-bridges. molar magnetic susceptibility measurements 1 2 2−300 K range indicate weak...