Ferromagnetic behavior of nickel(II)-imino nitroxide derivatives

Luneau, Dominique; Rey, P.; Laugier, J; Bélorizky, E.; Cogne, A.

doi:10.1021/ic00043a018

Cited by 91 publications

(53 citation statements)

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“…With respect to the symmetry of the complex, the distortion is very limited and the geometrical parameters are found to be comparable to those previously reported for similar complexes [35][36][37][38]. Strong intramolecular H-bonds between the uncoordinated carboxylic oxygen of the Nphthaloylglycinate ligand and the O-H group of methanol were observed in the complex, Table 7, O21Á Á ÁO102 = 2.639(4) Å , H21Á Á ÁO102 = 1.81(4) Å ; O21-H12Á Á ÁO102 = 163(4)°.…”

Section: Crystal Structure Of [Co(mimi) 2 (N-phthgly) 2 ] Ae H 2 O (1)supporting

confidence: 85%

Novel ternary cobalt(II) and nickel(II) complexes of N-phthaloylglycinate. Synthesis, characterization and X-ray crystal structure

Abdel‐Rahman

2006

Transition Met Chem

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A new series of N-phthaloylglycineate (N-phthgly) ternary complexes of cobalt(II) and nickel(II) with imidazole (imi), N-methylimidazole (mimi) and 2,2¢-bipyridyl (bipy) have been synthesized and characterized by elementary analyses, IR spectroscopy, thermogravimetric analysis. X-ray crystal structure analyses of the three complexes of [Co(mimi) 2 (N-phthgly) 2 ] (1), [Co(bipy)(OH 2 ) 4 ](N-phthgly) 2 (2) and [Ni(imi) 2 (N-phthgly) 2 (OHCH 3 ) 2 ] (3) were also carried out. In complex (1), the Co(II) exists in a distorted tetrahedral enviroment, where two nitrogen atoms of two methylimidazole molecules and two oxygen atoms of the carboxylate group of two N-phthaloylglycinate molecules are coordinated. On the other hand, in complex (2) the cobalt atom coordinates a 2,2¢-bipyridine molecule and four water oxygen atoms forming a distorted octahedral conformation. A molecule of N-phthaloylglycinate is connected by van der waals contact and H-bonds. For complex (3), the nickel atom is surrounded by four oxygens (two oxygens of two different N-phthaloylglycinate molecules and two of methanol ligand) in the basal plane of octahedron along with two imidazole nitrogen atoms at the apical positions. Strong intramolecular H-bond exists between the uncoordinated carboxylic oxygen of the N-phthaloylglycinate ligand and the O-H of the methanol group.

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Section: Crystal Structure Of [Co(mimi) 2 (N-phthgly) 2 ] Ae H 2 O (1)supporting

confidence: 85%

Novel ternary cobalt(II) and nickel(II) complexes of N-phthaloylglycinate. Synthesis, characterization and X-ray crystal structure

Abdel‐Rahman

2006

Transition Met Chem

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“…[46] Water molecules are known to mediate both ferro-and antiferromagnetic interactions through hydrogen bonding between different spin carriers, including copper(II), [47] nitronylnitroxide radicals, [48] chromiumA C H T U N G T R E N N U N G (III), [49] and mixed nickel(II)-radical systems. [50] The [Au(CN) 2 ] À unit has been observed to medi- www.chemeurj.org ate magnetic interactions between several first-row transition metals at low temperature. [19,27] A deeper understanding of the magnetic behavior of 1 and 2 can be gained by combining the SQUID magnetometry and ZF-mSR results, and some magneto-structural correlations can be drawn.…”

Section: Magnetic Properties Of Nia C H T U N G T R E N N U N G (M-ohmentioning

confidence: 99%

A New Basic Motif in Cyanometallate Coordination Polymers: Structure and Magnetic Behavior of M(μ‐OH₂)₂[Au(CN)₂]₂(M=Cu, Ni)

Lefebvre

Callaghan

Katz

et al. 2006

Chemistry A European J

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The structures of two cyanoaurate-based coordination polymers, M(mu-OH(2))(2)[Au(CN)(2)](2) (M=Cu, Ni), were determined by using a combination of powder and single-crystal X-ray diffraction techniques. The basic structural motif for both polymers contains rarely observed M(mu-OH(2))(2)M double aqua-bridges, which generate an infinite chain; two trans [Au(CN)(2)](-) units also dangle from each metal center. The chains form ribbons that interact three dimensionally through CNH hydrogen bonding. The magnetic properties of both compounds and of the dehydrated analogue Cu[Au(CN)(2)](2) were investigated by direct current (dc) and alternating current (ac) magnetometry; muon spin-relaxation data was also obtained to probe their magnetic properties in zero-field. In M(mu-OH(2))(2)[Au(CN)(2)](2), ferromagnetic chains of M(mu-OH(2))(2)M are present below 20 K. Interchain magnetic interactions mediated through hydrogen bonding, involving water and cyanoaurate units, yield a long-range magnetically ordered system in Cu(mu-OH(2))(2)[Au(CN)(2)](2) below 0.20 K, as indicated by precession in the muon spin polarization decay. Ni(mu-OH(2))(2)[Au(CN)(2)](2) undergoes a transition to a spin-glass state in zero-field at 3.6 K, as indicated by a combination of muon spin-relaxation and ac-susceptibility data. This transition is probably due to competing interactions that lead to spin frustration. A phase transition to a paramagnetic state is possible for Ni(mu-OH(2))(2)[Au(CN)(2)](2) upon application of an external field; the critical field was determined to be 700 Oe at 1.8 K. The dehydrated compound Cu[Au(CN)(2)](2) shows weak antiferromagnetic interactions at low temperatures.

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“…The cobalt(II) atom has two magnetic orbitals (d x 2 Ày 2 and d z 2 ) with r symmetry and one magnetic orbital (either of d xy , d xz , d yz ) with p symmetry. Thus, the imino radical ligand and metal magnetic orbitals are orthogonal, which results in ferromagnetic coupling as observed in complex 1 [33,34]. The observed weak ferromagnetic coupling can be attributed to the overlap of the p* orbital and another magnetic orbital of cobalt(II) (either of d xy , d xz , d yz ) leading to antiferromagnetic coupling.…”

Section: Bond Distancesmentioning

confidence: 88%

Synthesis, crystal structure and magnetism of two cobalt(II) complexes with imino and nitronyl nitroxides

Zhang

2015

Transition Met Chem

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Two new cobalt-radical complexes, namely [Co(IM-5-Br-2Py) 2 (N 3 ) 2 ]ÁMeOH (1) and [Co(NIT-5-Br2Py) 2 (N 3 ) 2 ] (2) (IM-5-Br-2Py = 2-(5-bromo-2-pyridyl)-4,4,5,5-tetramethyl-limidazoline-1-oxyl, NIT-5-Br-2Py = 2-(5-bromo-2-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) have been synthesized and characterized by magnetic and single-crystal X-ray diffraction studies. X-ray diffraction analysis indicates that both complexes possess mononuclear structures, in which two radical ligands coordinate to the Co(II) atom in chelating fashion and two azides act as terminal ligands. The magnetic properties for complexes 1 and 2 have been investigated in the temperature range 2-300 K. DC magnetic measurements show that the Co(II) atom of complex 1 interacts ferromagnetically with the directly bonding imino nitroxide, while the Co(II) atom strongly antiferromagnetically couples with the directly coordinated N-O group in complex 2.

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Ferromagnetic behavior of nickel(II)-imino nitroxide derivatives

Cited by 91 publications

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Novel ternary cobalt(II) and nickel(II) complexes of N-phthaloylglycinate. Synthesis, characterization and X-ray crystal structure

Novel ternary cobalt(II) and nickel(II) complexes of N-phthaloylglycinate. Synthesis, characterization and X-ray crystal structure

A New Basic Motif in Cyanometallate Coordination Polymers: Structure and Magnetic Behavior of M(μ‐OH₂)₂[Au(CN)₂]₂(M=Cu, Ni)

Synthesis, crystal structure and magnetism of two cobalt(II) complexes with imino and nitronyl nitroxides

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Ferromagnetic behavior of nickel(II)-imino nitroxide derivatives

Cited by 91 publications

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Novel ternary cobalt(II) and nickel(II) complexes of N-phthaloylglycinate. Synthesis, characterization and X-ray crystal structure

Novel ternary cobalt(II) and nickel(II) complexes of N-phthaloylglycinate. Synthesis, characterization and X-ray crystal structure

A New Basic Motif in Cyanometallate Coordination Polymers: Structure and Magnetic Behavior of M(μ‐OH2)2[Au(CN)2]2(M=Cu, Ni)

Synthesis, crystal structure and magnetism of two cobalt(II) complexes with imino and nitronyl nitroxides

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A New Basic Motif in Cyanometallate Coordination Polymers: Structure and Magnetic Behavior of M(μ‐OH₂)₂[Au(CN)₂]₂(M=Cu, Ni)