151
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Metelitsa AV, Burlov AS, Bezuglyi SO, Borodkina IG, Bren VA, Garnovskii AD, Minkin VI. Luminescent complexes with ligands containing C=N bond. RUSS J COORD CHEM+ 2006. [DOI: 10.1134/s1070328406120025] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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152
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Pokhodnya KI, Bonner M, Her JH, Stephens PW, Miller JS. Magnetic Ordering (Tc = 90 K) Observed for Layered [FeII(TCNE•-)(NCMe)2]+[FeIIICl4]- (TCNE = Tetracyanoethylene). J Am Chem Soc 2006; 128:15592-3. [PMID: 17147360 DOI: 10.1021/ja066744f] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Fe(TCNE)(NCMe)2][FeCl4] is isolated from the reaction of TCNE and FeCl2(NCMe)2 and orders as a ferrimagnet below 90 K and is the initial member of a new class of magnets. It is the first metal-TCNE magnet with direct bonding between metal ion and [TCNE]*- whose structure has been determined, and it possesses a novel planar mu4-[TCNE]*- spin coupling unit bonded to four FeII's, with an axial pair of MeCNs. The [FeIIICl4]- anion occupies sites between the [FeII(TCNE*-)(NCMe)2]+ layers. [Fe(TCNE)(NCMe)2][FeCl4] has a coercive field of 1730 Oe and a remnant magnetization of 7500 emuK/mol at 50 K.
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153
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Rajadurai C, Enkelmann V, Ikorskii V, Ovcharenko VI, Baumgarten M. Metal-Biradical Chains from a High-Spin Ligand and Bis(hexafluoroacetylacetonato)copper(II). Inorg Chem 2006; 45:9664-9. [PMID: 17112261 DOI: 10.1021/ic060197h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis, X-ray crystal structure, and magnetic studies of a rare example of organic/inorganic spin hybrid clusters extended in infinite ladder-type chain [Cu(C5F6HO2)2]7(C35H35N5O4)2 ([Cu(hfac)2]7(pyacbisNN)2, 2) formed by the reaction of a high spin nitronylnitroxide biradical C35H35N5O4 (pyacbisNN, 1) and bis(hexafluroacetylacetonate)copper(II) = Cu(hfac)2 are described. Single-crystal X-ray structure analysis revealed the triclinic P1 space group of 2 with the following parameters: a = 10.6191(4) A, b = 19.6384(7) A, c = 21.941(9) A, alpha = 107.111(7) degrees, beta = 95.107(8) degrees, gamma = 94.208(0) degrees , Z = 2. Each repeating unit in 2 carries a centrosymmetric cyclic six spin and a linear five spin cluster with four different copper coordination environments having octahedral and square planar geometries. These clusters are interconnected to form infinite chains which are running along the crystallographic b axis. The magnetic measurements show nearly paramagnetic behavior with very small variations over a large temperature range. The magnetic properties are thus result of complex competitions of many weak ferro- and antiferromagnetic interactions, which appear as small deviations from quite linear mu(eff) vs T dependence at low temperature. At high temperature (300-14 K), antiferromagnetic behavior dominates a little, while at very low temperature (14-2 K), a small increase of mu(eff) was observed. The magnetic susceptibility data are described by the Curie-Weiss law [chi = C/(T - theta)] with the optimal parameters C = 4.32 +/- 0.01 emuK/mol and theta = - 0.6 +/- 0.3 K, where C is the Curie constant and theta is the Weiss temperature.
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154
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Ovcharenko VI, Fokin SV, Romanenko GV, Ikorskii VN, Sagdeev RZ, Yachevskii DS, Chizhov DL, Charushin VN. Heterospin complexes based on dinuclear CuII triketonate and nitroxides. Russ Chem Bull 2006. [DOI: 10.1007/s11172-006-0531-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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155
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Taliaferro ML, Thorum MS, Miller JS. Room-Temperature Organic-Based Magnet (Tc≈50 °C) Containing Tetracyanobenzene and Hexacarbonylvanadate(−I). Angew Chem Int Ed Engl 2006; 45:5326-31. [PMID: 16847862 DOI: 10.1002/anie.200600988] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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156
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Taliaferro ML, Thorum MS, Miller JS. Room-Temperature Organic-Based Magnet (Tc≈50 °C) Containing Tetracyanobenzene and Hexacarbonylvanadate(−I). Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200600988] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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157
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Bagnato JD, Shum WW, Strohmeier M, Grant DM, Arif AM, Miller JS. The Structure of Fractionally Charged Tetracyanobenzenen− Present in [TCNB]32−. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200601070] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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158
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Burlov AS, Ikorskii VN, Uraev AI, Koshchienko YV, Vasil’chenko IS, Garnovskii DA, Borodkin GS, Nikolaevskii SA, Garnovskii AD. Synthesis and magnetic properties of new binuclear Cu(II) complexes with tridentate azomethine ligands. RUSS J GEN CHEM+ 2006. [DOI: 10.1134/s1070363206080214] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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159
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Denisova TO, Amel’chenkova EV, Pruss IV, Dobrokhotova ZV, Fialkovskii OP, Nefedov SE. Copper(II) trimethylacetate complexes with 3,5-dimethylpyrazole. RUSS J INORG CHEM+ 2006. [DOI: 10.1134/s0036023606070084] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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160
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Burlov AS, Koshchienko YV, Ikorskii VN, Vlasenko VG, Zarubin IA, Uraev AI, Vasil’chenko IS, Garnovskii DA, Borodkin GS, Nikolaevskii SA, Garnovskii AD. New magnetoactive copper complexes with Schiff’s bases. RUSS J INORG CHEM+ 2006. [DOI: 10.1134/s0036023606070096] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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161
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Abstract
The chemistry of 2,2,4,4-substituted pentane derivatives has been investigated with the aim of providing a flexible and versatile synthetic route to pyrimidinyl nitronyl nitroxides, in which the bis-N-oxy fragment is incorporated in a six-membered ring. The synthesis of 2,4-diamino-2,4-dimethylpentane and 2,4-bis(hydroxylamino)-2,4-dimethylpentane, convenient precursors of these nitroxides, is described and full characterization of a series of pyrimidinyl nitronyl nitroxides is reported, along with a preliminary study of their coordination properties.
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Affiliation(s)
- Peter Brough
- CEA-Grenoble, Département de Recherche Fondamentale sur la Matière Condensée, Service de Chimie Inorganique et Biologique,UMR-E3, CEA-UJF, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France
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162
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Thorum MS, Pokhodnya KI, Miller JS. Solvent enhancement of the magnetic ordering temperature (Tc) of the room temperature V[TCNE]x·S (S=solvent, TCNE=tetracyanoethylene; x∼2) magnet. Polyhedron 2006. [DOI: 10.1016/j.poly.2005.12.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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163
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X-ray emission and X-ray photoelectron studies of electron density distribution in Cu(II) complexes with 2-imidazoline nitroxides. J STRUCT CHEM+ 2006. [DOI: 10.1007/s10947-006-0336-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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164
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Uraev AI, Ikorskii VN, Bubnov MP, Lysenko KA, Vlasenko VG, Borodkina IG, Borodkin GS, Garnovskii DA, Garnovskii AD. Magnetoactive binuclear copper(II) complexes based on β-aminovinylimines. RUSS J COORD CHEM+ 2006. [DOI: 10.1134/s1070328406040105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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165
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166
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Turnbow L, Miller JS. The quest for magnets based upon S=1/2 bis(maleonitriledithiolato)nickelate(III), {Ni[S2C2(CN)2]2}−, and bis(maleonitriledithiolato)metallate(IV), {M[S2C2(CN)2]2}2− (M=Co, Cu). Polyhedron 2006. [DOI: 10.1016/j.poly.2005.08.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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167
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168
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Abstract
The development of molecules and assemblies of molecules exhibiting technologically important bulk properties, such as magnetic ordering, is an important worldwide research focus. Organic- and molecule-based magnets have been discovered and several families have been reported with magnetic ordering temperatures exceeding room temperature and as high as approximately 125 degrees C. Examples of both hard and soft magnets have been reported with coercivities as high at 27 000 Oe (and exceeding commercially available magnets) have been reported. Several examples are based on the radical anion of tetracyanoethylene, S = 1/2 [TCNE].-. The include ionic zero-dimensional (0-D) [FeCp*2]*+[TCNE]*- (Cp* = pentamethylcyclopentadienide), 1-D [MnTPP]+[TCNE]*- [TPP = meso-tetraphenylporphinato] coordination polymers, and 3-D extended network structured M[TCNE](x).ySolvent (M = V, Mn, Fe, Co, Ni, Dy). This Perspective focuses on work in our laboratory that will be discussed at the Dalton Discussion 9 meeting entitled "Functional Molecular Assemblies." In addition to the overview of TCNE-based organic magnets, the targeted design, preparation, and chemical as well as magnetic characterization of a new family of magnets based on S = 3/2 mixed-valent [Ru(II/III)2(O2CR)4]+ (R = Me, Bu(t)) is described. In particular [Ru2(O2CMe)4]3[Cr(CN)6] prepared from aqueous media possess two interpenetrating cubic lattices and magnetically orders at 33 K. In contrast, [Ru2(O2CBu(t))4]3[Cr(CN)6] forms a 2-D layered lattice and orders at 37.5 K. Both exhibit hysteretic behavior, however, this is quite anomalous for the former cubic lattice. This as well as other anomalous magnetic behaviors is attributed to the presence of the second interpenetrating lattice.
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Affiliation(s)
- Joel S Miller
- Department of Chemistry, University of Utah, Salt Lake City, UT 84112-0850, USA.
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169
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Taliaferro ML, Palacio F, Miller JS. The magnetic behaviors of the metamagnetic and ferromagnetic phases of [Fe(C5Me5)2][TCNQ] (TCNQ = 7,7,8,8-tetracyano-p-quinodimethane). Determination of the phase diagram for the metamagnetic phase. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b603016e] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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170
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Ribas-Ariño J, Novoa JJ, Miller JS. Analysis of the magneto-structural correlations in the meso-tetraphenylporphyrinatomanganese(iii) tetracyanoethenide family of molecule-based magnets. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b604759a] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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171
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Kim J, Han S, Pokhodnya KI, Migliori JM, Miller JS. Cyano-Bridged Hexanuclear Fe4M2 (M = Ni, Co, Mn) Clusters: Spin-Canted Antiferromagnetic Ordering of Fe4Ni2 Cluster. Inorg Chem 2005; 44:6983-8. [PMID: 16180860 DOI: 10.1021/ic0500356] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Heterobimetallic hexanuclear cyano-bridged complexes, [{Fe(Tp)(CN)3}4{M(MeCN)(H2O)2}(2)].10H2O.2MeCN [M = Ni (1), Co (2), Mn (3); Tp = hydrotris(1-pyrazolyl)borate], have been synthesized in H2O-MeCN solution. Complexes 1-3 are isostructural and hexanuclear with [{Fe(Tp)(CN)3}4{M(MeCN)(H2O)2}2] units linked by hydrogen bonds to form a 2D-structure in the solid state. Complex 1 is a canted antiferromagnet that undergoes a field-induced spin-flop-like transition at approximately 1 T and 2 K. At 4.45 K 1 has a transition to paramagnetic state of noninteracting S = 4 magnetic clusters. However, 2 and 3 show antiferromagnetic intracluster coupling. Facile loss of solvent from 2 alters the local symmetry resulting in changing the intracluster interaction from antiferro- to ferromagnetic.
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Affiliation(s)
- Jinkwon Kim
- Department of Chemistry, Kongju National University, Chungnam, Korea.
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172
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Cherkasov VK, Grunova EV, Abakumov GA. ESR investigation of paramagnetic derivatives of [6-tert-butyl-4-(5-tert-butyl-2-methyl-3,4-dioxocyclohexa-1,5-dien-1-yl)-3-methylcatecholato]triphenylantimony(V). Russ Chem Bull 2005. [DOI: 10.1007/s11172-006-0078-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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173
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Shevchenko DV, Petrusenko SR, Kokozay VN, Zhigalko MV, Zubatyuk RI, Shishkin OV, Skelton BW, Raithby PR. Heterobimetallic M/Zn (M=Cu, Ni) complexes with open-chain N- and N,O-ligands: Template synthesis from metal powders and supramolecular crystal structures. Inorganica Chim Acta 2005. [DOI: 10.1016/j.ica.2005.06.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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174
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175
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Chen J, Liao DZ, Jiang ZH, Yan SP. A new heterospin complex from oxamide-bridged Cu(II) binuclear units and carboxy-phenyl-substituted nitronyl nitroxide. INORG CHEM COMMUN 2005. [DOI: 10.1016/j.inoche.2005.02.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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176
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Shvedenkov Y, Bushuev M, Romanenko G, Lavrenova L, Ikorskii V, Gaponik P, Larionov S. Magnetic Anisotropy of New Layered Copper(II) Bromide Complexes of 1-Substituted Tetrazoles. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400505] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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177
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Burdukov A, Shvedenkov Y, Pervukhina N, Reznikov V. New Layered Polymeric Metamagnet Based on Copper(
II
) Complex with3‐Imidazoline Nitroxide. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400589] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alexei Burdukov
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrent’ev Ave., 3, Novosibirsk 630090, Russia, Fax: +7‐3832‐344‐489
| | - Yurii Shvedenkov
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrent’ev Ave., 3, Novosibirsk 630090, Russia, Fax: +7‐3832‐344‐489
| | - Natalie Pervukhina
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrent’ev Ave., 3, Novosibirsk 630090, Russia, Fax: +7‐3832‐344‐489
| | - Vladimir Reznikov
- Vorozhtzov Institute of Organic Chemistry SB RAS, Lavrent’ev Ave., 7, Novosibirsk 630090, Russia
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178
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Vos TE, Miller JS. Building Blocks for 2D Molecule-Based Magnets: The Diruthenium Tetrapivalate Monocation [RuII/III2(O2CtBu)4]+. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200462546] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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179
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Vos TE, Miller JS. Building Blocks for 2D Molecule-Based Magnets: The Diruthenium Tetrapivalate Monocation [RuII/III2(O2CtBu)4]+. Angew Chem Int Ed Engl 2005; 44:2416-9. [PMID: 15761895 DOI: 10.1002/anie.200462546] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Thomas E Vos
- Department of Chemistry, University of Utah, Salt Lake City, 84112-0850, USA
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180
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Sharma RP, Sharma R, Bala R, Rychlewska U, Warżajtis B. Layered solids based on second-sphere coordination interactions: synthesis, spectroscopic characterization, crystal structure and packing of two copper(II) naphthalene-2-sulfonates. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2004.12.038] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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181
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Hirel C, Pécaut J, Choua S, Turek P, Amabilino D, Veciana J, Rey P. Enantiopure and Racemic Chiral Nitronyl Nitroxide Free Radicals: Synthesis and Characterization. European J Org Chem 2005. [DOI: 10.1002/ejoc.200400454] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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182
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Burdukov AB, Guschin DA, Pervukhina NV, Shvedenkov YG, Reznikov VA. Copper-nitroxide coordination polymers with CrB4 topology. J STRUCT CHEM+ 2005. [DOI: 10.1007/s10947-006-0166-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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183
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Uraev AI, Vasilchenko IS, Ikorskii VN, Shestakova TA, Burlov AS, Lyssenko KA, Vlasenko VG, Kuz’menko TA, Divaeva LN, Pirog IV, Borodkin GS, Uflyand IE, Antipin MY, Ovcharenko VI, Garnovskii AD, Minkin VI. Copper(II) dimers with ferromagnetic intra- and intermolecular exchange interactions. MENDELEEV COMMUNICATIONS 2005. [DOI: 10.1070/mc2005v015n04abeh002144] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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184
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Liu Z, Lü Z, Zhang D, Jiang Z, Li L, Liu C, Zhu D. New Types of Heterospin Complexes from trans-Oxamido-Bridged Copper(II) Binuclear Units and Nitronyl Nitroxide Radicals: Crystal Structure and Magnetic Characterization. Inorg Chem 2004; 43:6620-7. [PMID: 15476359 DOI: 10.1021/ic049247d] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Three new heterospin complexes derived from trans-oxamido-bridged copper(II) binuclear units [Cu(2)(oxen), oxen = N,N-bis(2-aminoethyl)oxamide] and pyridine-substituted nitronyl nitroxides (o-, m-, and p-PYNN) were synthesized and characterized structurally and magnetically. Complexes 1 and 2 are four-spin complexes. Interestingly, it is found that in complex 3, the Cu(II) ions and m-PYNN units are arranged to form 1D double-stranded helical chains, which to the best of our knowledge is the first example of a metal nitronyl nitroxide complex with such a 1D helical structure. The temperature dependencies of the magnetic susceptibilities of 1 and 2 were fitted to the four-spin model with the Hamiltonian H = -2Js(Cu1)s(Cu2) - 2j(s(Cu1)s(rad1) - s(Cu2)s(rad2)), leading to J = -150.5 cm(-)(1) and j = 47.2 cm(-)(1) for complex 1 and J = -191.7 cm(-)(1) and j = -18.9 cm(-)(1) for complex 2. The temperature dependence of the magnetic susceptibility of complex 3 was approximately simulated with a simple model composed of a dimer of Cu(II) ions and two m-PYNN molecules. The best fitting leads to the values of J = -183.0 cm(-)(1) and zJ' = -0.55 cm(-)(1) for the magnetic exchange of two Cu(II) ions through the oxamide bridge and that between the dimer of Cu(II) ions and two m-PYNN molecules, respectively. The antiferromagnetic exchange of oxamido-bridged Cu(II) ions in complexes 1-3 is strong. The strength of such antiferromagnetic interactions is also similar for the three complexes.
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Affiliation(s)
- Zhiliang Liu
- Organic Solids Laboratory, Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PRC
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185
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Vos TE, Liao Y, Shum WW, Her JH, Stephens PW, Reiff WM, Miller JS. Diruthenium Tetraacetate Monocation, [RuII/III2(O2CMe)4]+, Building Blocks for 3-D Molecule-Based Magnets. J Am Chem Soc 2004; 126:11630-9. [PMID: 15366910 DOI: 10.1021/ja048135i] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diruthenium tetracarboxylates monocations are utilized as building blocks for cubic 3-D network structured molecule-based magnets. [Ru(II/III)(2)(O(2)CMe)(4)](3)[M(III)(CN)(6)] [M = Cr (1a), Fe (2), Co (3)] were prepared in aqueous solution. Powder X-ray diffraction indicates that they have body-centered cubic structures (space group = Imm, a = 13.34, 13.30, and 13.10 A for 1a, 2, and 3, respectively), which was confirmed for 1a by Reitveld analysis of the synchrotron powder data [a = 13.3756(5) A]. [Ru(2)(O(2)CMe)(4)](3)[M(III)(CN)(6)].xMeCN [M = Cr, x = 1.8 (1b); M = Mn, x = 3.3 (4)] were prepared from acetonitrile. The magnetic ordering of 1a (33 K), 1b (34.5 K), 2 (2.1 K), and 4 (9.6 K) was determined from the temperature dependencies of the in-phase (chi') alternating current (AC) susceptibility. The field dependence of the magnetization, M(H), at 2 K for 1a showed an unusual constricted hysteresis loop with a coercive field, H(cr), of 470 Oe while the M(H) data for 1b, 2, and 4 showed a normal hysteresis loop with a coercive field of 1670, 10, and 990 Oe, respectively. The (57)Fe Mössbauer spectrum of 2 is consistent with the presence of low spin Fe(III) (delta = -0.05 mm/s; DeltaE = 0.33 mm/s) at room temperature, and the onset of 3-D magnetic ordering at lower temperature (<2 K). The effects of M(III) in [M(III)(CN)(6)](3-), and the large zero-field splitting (D) of diruthenium tetracarboxylates are discussed. The increasing critical temperatures T(c), with increasing S could not be accounted for by mean field models without significantly different J values for 1a, 4, and 2. By fitting the T(c) data with mean field models [H = -2JS(Ru).(S(M) - micro(B)(g(Ru)S(Ru) + g(M)S(M))H], J/k(B) are 4.46, 1.90, and 0.70 K for 1a, 4, and 2, respectively.
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Affiliation(s)
- Thomas E Vos
- Contribution from the Department of Chemistry, University of Utah, 315 S. 1400 E. RM 2124, Salt Lake City, Utah 84112-0850, USA
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186
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Dong W, Zhu LN, Song HB, Liao DZ, Jiang ZH, Yan SP, Cheng P, Gao S. A Prussian-Blue Type Ferrimagnet Na[MnCr(CN)6]: Single Crystal Structure and Magnetic Properties. Inorg Chem 2004; 43:2465-7. [PMID: 15074961 DOI: 10.1021/ic0352710] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel Prussian-blue type ferrimagnet Na[MnCr(CN)(6)] has been prepared and characterized by single crystal X-ray analysis and magnetic measurements. The complex has a face-centered cubic lattice and shows ferrimagnetic ordering below 60 K.
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Affiliation(s)
- Wen Dong
- Department of Chemistry, Nankai University, Tianjin 300071, China
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187
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Vickers EB, Selby TD, Miller JS. Magnetically Ordered (Tc = 200 K) Bis(tetracyanopyrazine)vanadium, V[TCNP]2·yCH2Cl2. J Am Chem Soc 2004; 126:3716-7. [PMID: 15038716 DOI: 10.1021/ja0397308] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new organic-based magnet, V[TCNP]2.yCH2Cl2 (TCNP = tetracyanopyrazine), has been synthesized, and its magnetic properties have been examined. The amorphous nature of V[TCNP]2.yCH2Cl2 makes it difficult to determine the structure of the material; however, ac and dc magnetic measurements indicate that it is a ferrimagnet below 200 K with a small coercive field of 8 Oe at 5 K.
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Affiliation(s)
- Elaine B Vickers
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, USA
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188
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Tretyakov EV, Koreneva OV, Romanenko GV, Shvedenkov YG, Ovcharenko VI. Synthesis, structure and magnetism of M(hfac)2 complexes with spin labelled amides. Polyhedron 2004. [DOI: 10.1016/j.poly.2003.11.054] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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189
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Fokin S, Ovcharenko V, Romanenko G, Ikorskii V. Problem of a Wide Variety of Products in the Cu(hfac)2−Nitroxide System. Inorg Chem 2004; 43:969-77. [PMID: 14753818 DOI: 10.1021/ic034964d] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The stereochemically flexible Cu(hfac)(2) metal-ligand system when combined with polyfunctional nitroxides leads to a variety of solids with varying structure and composition. While investigating the products of Cu(hfac)(2) interaction with spin-labeled pyrazole 4,4,5,5-tetramethyl-2-(1-methyl-1H-pyrazol-4-yl)-imidazoline-3-oxide-1-oxyl, we have isolated a family of (12) heterospin compounds differing in structure and composition in the solid state. In synthetic systems, these compounds often cocrystallize and must be separated mechanically. It is also shown that minor variation of the structure of the solid heterospin complex can substantially change the magnetic properties of compounds.
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Affiliation(s)
- Sergei Fokin
- International Tomography Center, Russian Academy of Sciences, Institutskaya 3a, 630090 Novosibirsk, Russia
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190
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Tretyakov EV, Romanenko GV, Ovcharenko VI. Syntheses and structures of azol-1-yl derivatives of nitronyl and imino nitroxides. Tetrahedron 2004. [DOI: 10.1016/j.tet.2003.10.087] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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191
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Batten SR, Murray KS. Structure and magnetism of coordination polymers containing dicyanamide and tricyanomethanide. Coord Chem Rev 2003. [DOI: 10.1016/s0010-8545(03)00119-x] [Citation(s) in RCA: 933] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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192
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Larue B, Tran LT, Luneau D, Reber C. Crystal structures, magnetic properties, and absorption spectra of nickel(II) thiocyanato complexes: a comparison of different coordination geometries. CAN J CHEM 2003. [DOI: 10.1139/v03-114] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Thiocyanatonickel(II) compounds with composition {(AsPh4)2[Ni(NCS)4]} 1, {(Cat)[Ni(NCS)4]} 2, {(AsPh4)4 [Ni2(NCS)8]} 3, {(Cat)2[Ni2(NCS)8]·2CH3NO2} 4, and {(Et4N)4[Ni(NCS)6]} 5 (Cat2+ = (p-xylylenebis(triphenyphosphonium))2+) were prepared. The crystal structures of compounds 1, 3, and 4 were determined. Compound 1 crystallizes in the monoclinic C2/c space group with a = 22.761(2) Å, b = 15.055(1) Å, c = 15.054(1) Å, β = 108.915(1)°, V = 4879.9(6) Å3, and Z = 4. Compound 3 crystallizes in the triclinic P1 space group with a = 11.2183(6) Å, b = 14.2551(8) Å, c = 16.629(1) Å, α = 79.326(1)°, β = 73.605(1)°, γ = 75.496(1)°, V = 2451.0(2) Å3, Z = 2. Compound 4 crystallizes in the monoclinic P21/n space group with a = 13.1148(9) Å, b = 27.128(2) Å, c = 14.882(1) Å, β = 114.056(2)°, V = 4834.8(6) Å3, Z = 4. The magnetic properties of compounds 1-4 were studied over the 2300 K temperature range. Compounds 1 and 2 with monometallic [Ni(NCS)4]2 complex units have similar magnetic properties, in agreement with nickel(II) ions in pseudo-tetrahedral environments. Compounds 3 and 4 with bimetallic [Ni2(NCS)8]4 complex units exhibit magnetic properties, which are indicative of Ni(II)Ni(II) ferromagnetic interactions with zero-field splitting effects caused by the pseudo-square-pyramidal or pseudo-trigonal-bipyramidal coordination environments of the nickel(II) ion in compounds 3 and 4, respectively. The structures and magnetic results for all compounds are correlated with NIRUVvis absorption spectra.Key words: nickel(II) thiocyanato complexes, crystal structures, paramagnetism, molecular magnetism, exchange coupling, absorption spectroscopy.
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193
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A pentanuclear complex derived from manganese(III) Schiff-based complex and hexacyanoferrate(III): synthesis, structure and magnetic properties. INORG CHEM COMMUN 2003. [DOI: 10.1016/s1387-7003(03)00203-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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194
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Price DJ, Batten SR, Moubaraki B, Murray KS. Synthesis, structure and magnetism of {[Mn(μ-OH)(μ-OAc) 2 ]·HOAc·H 2 O} n and the facilitation of long-range magnetic order through hydrogen bonding. Polyhedron 2003. [DOI: 10.1016/s0277-5387(03)00180-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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195
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Tretyakov EV, Fokin SV, Romanenko GV, Ovcharenko VI. Nitronyl nitroxides containing tetrazole substituents and metal complexes with spin-labeled tetrazole. Polyhedron 2003. [DOI: 10.1016/s0277-5387(03)00157-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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196
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197
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Stroh C, Belorizky E, Turek P, Bolvin H, Ziessel R. Aminomethyl-bipyridine bearing two flexible nitronyl-nitroxide arms: a new podand for complexation of transition metals in a facial or meridional conformation. Inorg Chem 2003; 42:2938-49. [PMID: 12716186 DOI: 10.1021/ic020484v] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Transition metal complexes of 6-aminomethyl-bis[methyl-2-(4,5-dihydro-4,4,5,5- tetramethylimidazolinyl-3-oxide-l-oxy)]-2,2'-bipyridine, bpyN(NIT)(2), 1, have been synthesized and characterized by FAB-MS, UV-vis, FT-IR, and EPR spectroscopies, elemental analysis, and susceptibility measurements. Single-crystal X-ray diffraction studies have been performed on all compounds giving the following crystal data: bpyN(NIT)(2), 1, triclinic, P(-)1, Z = 2, a = 10.7224(4) A, b = 11.0995(4) A, c = 13.1134(3) A, alpha = 114.101(9) degrees, beta = 97.476(9) degrees, gamma = 99.667(9) degrees; ZnbpyN(NIT)(2), 2, hexagonal, P3(2), Z = 3, a = 15.4545(3) A, b = 15.4545(3) A, c = 13.5594(3) A; NibpyN(NIT)(2), 3, hexagonal, P3(2), Z = 3, a = 15.2867(1) A, b = 15.2867(1) A, c = 13.7160(1) A; CubpyN(NIT)(2), 4, triclinic, P(-)l, Z = 2, a = 11.8640(4) A, b = 13.2023(4) A, c = 13.2661(5) A, alpha = 90.539(9) degrees, beta = 104.983(9) degrees, gamma = 113.252(9) degrees. The two radicals of the free ligand 1 are almost perpendicular to one another in the solid state, favoring a weak ferromagnetic interaction (J/k(B) = 8.8 K). The complexes obtained by wrapping the ligand around a single metal center gave rise to two different coordination schemes where the two radicals of 1 adopt a ON(3)O meridional (with Ni and Zn) or a ON(3)O facial conformation (with Cu), which strongly affects the magnetic and electronic properties (O accounts for the coordinated oxygen atoms of the nitroxide radicals and N(3) accounts for the tertiary amine). For 2, a model of a dimer has been used giving rise to a weak antiferromagnetic interaction between the radicals (J/k(B) = -5.3 K). For 3, a very strong intramolecular antiferromagnetic coupling has been found and estimated at J/k(B) = -230 K and J'/k(B) = -110 K between the nickel and each radical using an asymmetric model of a trimer. For 4, an unusual magnetic behavior is observed, dominated by antiferromagnetic interactions with a residual plateau at chiT = 0.63 emu.K.mol(-)(1). Molecular modeling at the CASSCF level is in keeping with an antiferromagnetic coupling of the radical bound with the Cu(II) in the equatorial position. The combined structural, electronic, and magnetic characteristics suggest that the use of a flexible molecule provide an additional approach for fine-tuning magnetic interactions.
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Affiliation(s)
- Christophe Stroh
- Laboratoire de Chimie Moléculaire, Ecole de Chimie, Polymères et Matériaux (ECPM), UMR 7008, Université Louis Pasteur (ULP), 25 rue Becquerel, F-67087 Strasbourg Cedex 2, France
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198
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Brough P, Chiarelli R, Pécaut J, Rassat A, Rey P. A versatile synthesis of new pyrimidinyl nitronyl nitroxides. Chem Commun (Camb) 2003:2722-3. [PMID: 14649829 DOI: 10.1039/b309786b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pyrimidinyl nitronyl nitroxides where the bis-N-oxy fragment is included in a six-membered ring were prepared from diacetonamine by a sequence of reactions including a Grignard reaction, a Ritter reaction and oxidation of the intermediate pyrimidine; the properties of the 2-phenyl-substituted representative are fully described.
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Affiliation(s)
- P Brough
- Département de Recherche Fondamentale sur la Matiére Condensée, Service de Chimie Inorganique et Biologique, (UMR CNRS 5046), 17 Rue des Martyrs F38054, Grenoble Cedex 09, France
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199
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Lescop C, Luneau D, Rey P, Bussière G, Reber C. Synthesis, structures, and magnetic and optical properties of a series of europium(III) and gadolinium(III) complexes with chelating nitronyl and imino nitroxide free radicals. Inorg Chem 2002; 41:5566-74. [PMID: 12377055 DOI: 10.1021/ic0257928] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper reports the synthesis, structures, and magnetic and optical properties of a series of gadolinium(III) (1a-4a) and europium(III) (1b-4b) complexes with nitronyl or imino nitroxide radicals. The crystal structures of compounds 1a and 1b consist of [Ln(III)(radical)(2)(NO(3))(3)] entities in which the gadolinium(III) (1a) or europium(III) ion (1b) is 10-coordinated to two nitronyl nitroxide radicals and three nitrato ligands. The crystal structures of compounds 2a-4a and 2b-4b consist of [Ln(III)(hfac)(3)(radical)] entities in which the gadolinium(III) (2a-4a) or europium(III) ion (2b-4b) is 8-coordinated to one nitronyl (2a and 2b) or one imino (3a, 4a and 3b, 4b) nitroxide radical and three hexafluoroacetylacetonato ligands. The gadolinium(III) complexes (1a-4a) are isostructural with their europium(III) analogues (1b-4b). The magnetic properties of the gadolinium complexes were studied. Along the series 1a-4a only compound 2a exhibits a ferromagnetic Gd(III)-radical coupling (J(Gd-rad) = +1.7 cm(-1)), while for the others this coupling is antiferromagnetic (1a: J(Gd-rad1) = -4.05 cm(-1) and J(Gd-rad2) = -0.80 cm(-1); 3a: J(Gd-rad) = -2.6 cm(-1); 4a: J(Gd-rad) = -1.9 cm(-1)). The first full luminescence spectra of lanthanide complexes with free radical ligands are reported between 650 and 1200 nm. The rich vibronic structure in luminescence and absorption spectra indicates that several excited states define the absorption spectra between 400 and 800 nm. Qualitative trends can be established between magnetic ground state properties and the energies and fine structure of the title compounds.
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Affiliation(s)
- Christophe Lescop
- Laboratoire de Chimie Inorganique et Biologique (UMR 5046), DRFMC, CEA-Grenoble, 17 Rue des Martyrs, 38054 Grenoble Cedex 09, France
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200
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Liao Y, Shum WW, Miller JS. Synthesis and magnetic properties of 3-D [Ru(II/III)(2)(O(2)CMe)(4)](3)[M(III)(CN)(6)] (M = Cr, Fe, Co). J Am Chem Soc 2002; 124:9336-7. [PMID: 12167004 DOI: 10.1021/ja020552c] [Citation(s) in RCA: 135] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Three-dimensional network structures of [Ru(II/III)(2)(O(2)CMe)(4)](3)[M(III)(CN)(6)] (M = Cr, Fe, Co) composition have been formed and their magnetic properties characterized. [Ru(II/III)(2)(O(2)CMe)(4)](3)[M(III)(CN)(6)] (M = Cr, Fe, Co) have nu(CN) IR absorptions at 2138, 2116, and 2125 cm(-1) and have body-centered unit cells (a = 13.34, 13.30, and 13.10 A, respectively) with -M-Ctbd1;N-Ru=Ru-Ntbd1;C-M- linkages along all three Cartesian axes. [Ru(II/III)(2)(O(2)CMe)(4)](3)[Cr(III)(CN)(6)] magnetically orders as a ferrimagnet (T(c) = 33 K) and has an unusual constricted hysteresis loop.
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Affiliation(s)
- Yi Liao
- Department of Chemistry, University of Utah, 315 South 1400 East Room 2124, Salt Lake City 84112-0850, USA
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