Synthesis, crystal structure and magnetism of centrosymmetric linear trinuclear copper(II) complex of pyridine nitronyl nitroxide derivative

Chandrasekar, Rajadurai; Ostrovsky, Serghei; Falk, Karsten; Enkelmann, Volker; Haase, Wolfgang; Baumgarten, Martin

doi:10.1016/j.ica.2003.08.017

Cited by 25 publications

(16 citation statements)

References 20 publications

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“…[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][33][34][35] As expected, the complexes reported herein contain chelating κ 2 -O,O'-bonded F 6 acac formally anionic groups with Cu-O bond lengths which are of the typical range (1.9-2.2 Å). The oxazoline ligand, predictably N-bonded, 4,5,[7][8][9][10][11][12]31 occupies a basal position with one of the F 6 acac O-atoms occupying the formal equatorial position of an idealised square pyramidal ligand arrangement.…”

Section: Compoundsupporting

confidence: 61%

“…This copper containing starting material has been extensively studied in coordination chemistry and materials science due to its ability to coordinate a variety of N-donor ligands which includes organic radicals, heterocycles, primary amines, etc. A wide variety of structural bonding motifs [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] have been observed in the resulting coordination compounds. …”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterisation of the First Oxazoline Coordination Compounds Containing the Cu(F6acac)2 Unit: X-ray Diffraction Studies of Cu(kappa2-O,O'-F6acac)2(kappa1-N-Meox) and Cu(kappa2-O,O'-F6acac)2(kappa1-N-Etox)

Yadav

Barclay

Gossage

2013

J. Nepal Chem. Soc.

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Section: Compoundsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterisation of the First Oxazoline Coordination Compounds Containing the Cu(F6acac)2 Unit: X-ray Diffraction Studies of Cu(kappa2-O,O'-F6acac)2(kappa1-N-Meox) and Cu(kappa2-O,O'-F6acac)2(kappa1-N-Etox)

Yadav

Barclay

Gossage

2013

J. Nepal Chem. Soc.

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“…The synthesis of the doublet monoradical PyNN has been described earlier 9 . Re-crystallization of PyNN from the mixed solvents of dichloromethane: hexane (1:1) yielded blue needle-shaped single crystals.…”

Section: Synthesis and Crystal Structurementioning

confidence: 99%

A supramolecular network of 2‐(4,4,5,5‐tetramethyl‐3‐oxylimidazoline‐1‐oxide)‐5‐bromopyridine built through π–π stacking and hydrogen bonding interactions

Chandrasekar

Fuhr²,

Enkelmann

et al. 2006

J of Physical Organic Chem

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The X-ray study of 2-(4,4,5,5-tetramethyl-3-oxylimidazoline-1-oxide)-5-bromopyridine (PyNN) shows an unusual 3-D supramolecular assembly formed by the combined non-covalent interactions of p-p stacking and H-bonding forces. The mean p-p stacking distance between two pyridine units is $3.64 Å . The angle between the plane of the pyridine ring and the stack column axis (c-axis) is 7.468. The H-bonding distance between the oxygen atom of the water and the nitronyl nitroxide (NN) oxygen [HÁÁÁO-N] is 1.891 Å . Two potential short N-OÁÁÁO-N contacts are found (N-O1ÁÁÁO1-N ¼ 3.673 Å and N-O1ÁÁÁO2-N ¼ 3.695 Å ) along the stacked column. Four water molecules through H-bonding with four different radical oxygens form a perfect square in the a, b plane which extends as a tubular cage along the stack axis. Experimental spin densities of PyNN estimated from the 1 H-NMR spectroscopy and its bulk magnetic property have been correlated with the X-ray structure in an attempt to understand the possible magnetic exchange interactions. The observed low temperature antiferromagnetic interaction is analyzed on the basis of McConnell's model I (spin polarization approach) and this magnetic behavior is probably due to the dominant N-OÁÁÁO-N close contacts along the chain surpassing the stacking, H-bonding and other interactions.

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“…[15,16]. Bond distances and angles in the hfac molecules are in the normal range for this kind of compound [17,18].…”

Section: Crystal Structure Of (2)mentioning

confidence: 89%

Syntheses, crystal structures and magnetic properties of a new thienyl-substituted nitronyl nitroxide and its copper(II) complex

Jiang

Wang

et al. 2008

Journal of Coordination Chemistry

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2008) Syntheses, crystal structures and magnetic properties of a new thienyl-substituted nitronyl nitroxide and its copper(II) complex, Journal of Coordination Chemistry, 61:3, 410-418To link to this article: http://dx.A new building block for molecule-based magnetic materials À thiophene-substituted nitronyl nitroxide, NIT2-thp, [1, NIT2-thp ¼ 4,4,5,5-tetramethyl-2-(thiophenal-2-yl)imidazoline-1-oxyl-3-oxide] and its copper(II) complex [Cu(hfac) 2 ] 3 (NIT2-thp) 2 (2) (hfac ¼ hexafluoroacetylacetonate) have been synthesized and characterized structurally and magnetically. For 1, dimers were formed and arranged through intermolecular interactions, the shortest contact between nitroxide groups is 4.115 Å among adjacent dimers. In 2 two types of copper interaction with 1 give three colinear Cu(II) ions linked by two -1,4 bridging nitroxide ligands. The central metal ion is in a distorted octahedron, axially coordinated by two nitroxide oxygen atoms, while the two external metal ions are in distorted square-pyramidal environments with the nitroxide oxygen atom coordinated in the basal plane. Magnetic susceptibility data for 1 and 2 have been measured in the range 3-300 K. There are antiferromagnetic interactions (J ¼ À3.89 cm À1 ) between the dimers of 1 and also ferromagnetic interactions in 2. The magnetic properties of 1 and 2 are discussed in connection with their crystal structures.

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Synthesis, crystal structure and magnetism of centrosymmetric linear trinuclear copper(II) complex of pyridine nitronyl nitroxide derivative

Cited by 25 publications

References 20 publications

Synthesis and Characterisation of the First Oxazoline Coordination Compounds Containing the Cu(F6acac)2 Unit: X-ray Diffraction Studies of Cu(kappa2-O,O'-F6acac)2(kappa1-N-Meox) and Cu(kappa2-O,O'-F6acac)2(kappa1-N-Etox)

Synthesis and Characterisation of the First Oxazoline Coordination Compounds Containing the Cu(F6acac)2 Unit: X-ray Diffraction Studies of Cu(kappa2-O,O'-F6acac)2(kappa1-N-Meox) and Cu(kappa2-O,O'-F6acac)2(kappa1-N-Etox)

A supramolecular network of 2‐(4,4,5,5‐tetramethyl‐3‐oxylimidazoline‐1‐oxide)‐5‐bromopyridine built through π–π stacking and hydrogen bonding interactions

Syntheses, crystal structures and magnetic properties of a new thienyl-substituted nitronyl nitroxide and its copper(II) complex

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