Yttrium(III) and lanthanide(III) perchlorate complexes with the 2,2,6,6- tetramethylpiperidine nitroxide free radical

Mikulski, Chester M.; GELFAND, L. S.; Pytlewski, L.L.; Skryantz, John S.; Karayannis, Nicholas M.

doi:10.1007/bf01393568

Cited by 7 publications

(1 citation statement)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only a few iron complexes with nitroxide radicals are known. , The iron complex 2 gave a magnetic moment μ = 1.81 μ B at 293 K, which decreases to 1.0 μ B at 60 K (Figure ). We assume that iron has the oxidation state +II and is low spin d 6 ( S = 0).…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Structure, and Magnetic Properties of Transition Metal Complexes of the Nitroxide 2,5-Dihydro-4,5,5-trimethyl-2,2-bis(2-pyridyl)imidazole-1-oxyl

et al. 1996

View full text Add to dashboard Cite

With the radical 2,5-dihydro-4,5,5-trimethyl-2,2-bis(2-pyridyl)imidazole-1-oxyl (L) a series of transition metal complexes have been prepared: [ML(2)](SbF(6))(2) with M(2+) = Mn(2+) (1), Fe(2+) (2), Co(2+) (3), Ni(2+) (4), Cu(2+) (5), and Zn(2+) (6), Cu(L)(Cl)(2)(MeOH) (7), and Cu(L)SO(4).H(2)O (8). The structures of 1, 3, and 6 were determined by X-ray structural analyses. In these compounds the tridendate L is coordinated to the metal ion by the two pyridine nitrogen donors and by the oxygen atom of the nitroxide group. The N-O bond distances are 1.25(2) Å (1), 1.267(13) Å (3), and 1.260(11) Å (6). The M-O-N angles are 117.0(10) degrees (1), 114.5(8) degrees (3), and 114.2(7) degrees (6). Crystal data: space group P2(1)/n, for 1, 3, and 6; compound 1, a = 10.806(3) Å, b = 14.101(6) Å, c = 14.253(4) Å, beta = 108.82(2) degrees, V = 2055.7(12) Å(3), Z = 2, R(1) = 0.0677, wR(2) = 0.1512. Compound 3, a = 10.761(4) Å, b = 14.253(6) Å, c = 14.108(5) Å, beta = 111.16(3) degrees, V = 2017.9(13) Å(3), Z = 2, R(1) = 0.0702, wR(2) = 0.1460; compound 6, a = 10.788(2) Å, b = 14.147(3) Å, c = 14.196(3) Å, beta = 109.93(3) degrees, V = 2036.8(7) Å(3), Z = 2, R(1) = 0.0573, wR(2) = 0.1194. Magnetic measurements of 1, 2, 5, and 8 show strong antiferromagnetic interaction between the spin of the metal ion and the spin of the radical which increases at lower temperatures. For 6 the magnetic moment corresponds to two noninteracting spins in the temperature range 60-300 K.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis, Structure, and Magnetic Properties of Transition Metal Complexes of the Nitroxide 2,5-Dihydro-4,5,5-trimethyl-2,2-bis(2-pyridyl)imidazole-1-oxyl

et al. 1996

View full text Add to dashboard Cite

show abstract

Metal–Nitroxide Complexes: Synthesis and Magnetostructural Correlations

Овчаренко¹

2010

Stable Radicals

View full text Add to dashboard Cite

IntroductionInteractions between the paramagnetic ions of transition metals and stable radicals are convenient and effective methods for the synthesis of multispin molecules. These metal-nitroxide systems are often called heterospin systems because they contain paramagnetic centers with both d (or f) odd electrons and centers with p electrons. Paramagnetic centers can differ in the electron spin, g factor, the character of electron spin density delocalization, and heat capacity. The presence of several paramagnetic centers in heterospin molecules has stirred growing interest in their magnetic properties because these compounds are convenient objects for studying the subtle peculiarities of exchange interactions and revealing valuable magnetostructural correlations. That is why coordination chemistry of transition metals with stable nitroxides is an actively developing direction in modern chemistry that contributes to problem solving in the field of molecular magnetism. The results of studies on the synthesis and properties of metal complexes with nitroxides have been considered from different viewpoints and at different times in many monographs and reviews. 1 -19 Importantly, this approach offers the potential for control over the structure of the designed heterospin molecule and the character of interactions between the odd electrons of paramagnetic centers, which is necessary for constructing justifiable magnetostructural correlations. This is one of the factors responsible for the continuous growth of the number of new metal-nitroxide complexes. The Cambridge Structural Database alone contains more than one thousand structurally defined metal-nitroxide systems. 20 Therefore, currently it is impossible and not necessary to collect all available literature data on the synthesis and properties of metal-nitroxide systems in one publication. In any account, a comprehensive review of this kind will already have become incomplete by the time of its publication because new heterospin compounds based on transition metal compounds with nitroxides are being added daily to the list. However, the Stable Radicals: Fundamentals and Applied Aspects of Odd-Electron CompoundsEdited by Robin G. Hicks

show abstract

ChemInform Abstract: YTTRIUM(III) AND LANTHANIDE(III) PERCHLORATE COMPLEXES WITH THE 2,2,6,6‐TETRAMETHYLPIPERIDINE NITROXIDE FREE RADICAL

Mikulski

GELFAND

Pytlewski

et al. 1979

Chemischer Informationsdienst

View full text Add to dashboard Cite

show abstract

Yttrium(III) and lanthanide(III) perchlorate complexes with the 2,2,6,6- tetramethylpiperidine nitroxide free radical

Cited by 7 publications

References 58 publications

Synthesis, Structure, and Magnetic Properties of Transition Metal Complexes of the Nitroxide 2,5-Dihydro-4,5,5-trimethyl-2,2-bis(2-pyridyl)imidazole-1-oxyl

Synthesis, Structure, and Magnetic Properties of Transition Metal Complexes of the Nitroxide 2,5-Dihydro-4,5,5-trimethyl-2,2-bis(2-pyridyl)imidazole-1-oxyl

Metal–Nitroxide Complexes: Synthesis and Magnetostructural Correlations

ChemInform Abstract: YTTRIUM(III) AND LANTHANIDE(III) PERCHLORATE COMPLEXES WITH THE 2,2,6,6‐TETRAMETHYLPIPERIDINE NITROXIDE FREE RADICAL

Contact Info

Product

Resources

About