Nickel(II) complexes with substituted ureas

Bailey, R. A.; Feins, I R; Peterson, T. R.

doi:10.1139/v69-023

Cited by 10 publications

(6 citation statements)

References 6 publications

(8 reference statements)

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“…This is found here at 1625-1640 cm-'. The N-H stretching region near 3400 cm-' shows no shift to lower energy, and other bands behave similarly to those observed in other oxygen-bonded N-butylurea complexes (12).…”

Section: Infiared Spectrasupporting

confidence: 78%

“…Dq for the N,N1-dibutylurea complexes, 1640 cm-l, is slightly greater than the 1540 cm-l of N,Nf-dimethylurea given by Stonestreet et al (7). Substitutents on the urea ligands have some effect on the coordination strengths toward Cr(II1) as toward Ni(I1) (12).…”

Section: Electronic Spectramentioning

confidence: 61%

“…spectra of the coordinated ligands can be used to indicate the mode of bonding of the organic ligands in these compounds. For N-butylurea, comparison with other substituted ureas (12) suggests that the most distinctive change expected on coordination through oxygen is a decrease in the energy of the C=O stretching band at 1650 cm-'. This is found here at 1625-1640 cm-'.…”

Section: Infiared Spectramentioning

confidence: 99%

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Some substituted urea and thiourea complexes of Co(II), Mn(II), and Cr(III)

Askalani¹,

Bailey²

1969

Can. J. Chem.

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Complexes of Co(II), Mn(II), and Cr(II1) with N-butylurea, N-methylthiourea, and N,N1-dimethylthiourea, and C1-, Br-, NO3-, and C104-anions were prepared and characterized using infrared and visible spectroscopy, and magnetic susceptibility. The urea is bonded through oxygen, and the thioureas through sulfur in all cases. The Co-N-butylurea compounds are octahedral, mostly with CoLGXZ stoichiometries, but some compounds involving coordinated anions and possibly bridging butylurea ligands were found. The Co-thioureas are tetrahedral. Octahedral Cr(II1) con~pounds of the type CrL3X3 and CrLG(C104)3 were prepared, and the CrS, chromophore characterized. Mn(I1)-butylureas arc octahedral, while the thioureas show MnLGXz and MnL4X2 stoichiometries. X-ray diffraction established some of the latter to be isostructural with the analogous tetrahedral Co(I1) compounds. Ligand field parameters Dq and B have been evaluated for the Co(I1) and Cr(II1) con~pounds.

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Section: Infiared Spectrasupporting

confidence: 78%

Section: Electronic Spectramentioning

confidence: 61%

Section: Infiared Spectramentioning

confidence: 99%

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Some substituted urea and thiourea complexes of Co(II), Mn(II), and Cr(III)

Askalani¹,

Bailey²

1969

Can. J. Chem.

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“…In [Mn(DMU) 3 I 2 ], the Mn atom is coordinated by three O atoms of the DMU molecules and two iodido ligands (Delaunay & Hugel, 1986). Nickel complexes with DMU are octahedral (except for a thiocyanate-containing complex) (Bailey et al, 1969).…”

Section: Commentmentioning

confidence: 99%

Tris(1,3-dimethylurea)diiodidocadmium(II)

et al. 2007

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“…Ureas may act as ligands to transition metal systems 10 through the O-or the N-atoms: the h 1 -O, h 1 -N and h 2 -N,N¢ modes of bonding 11 have been demonstrated. [15][16][17] The renovated interest in metal complexes (Mn II , Co II , Ni II , Cu II , Zn II , lanthanides) with N,N¢-dimethylurea-DMU, O-bonded to the metal, was due to their ability to form supramolecular 2D structures. Metal complexes containing 2, 4, 6 molecules of urea itself, 10,12 either O-or N-bonded have been described and a rare example of a chelate h 2 -N,N¢ mode of bonding has recently been described.…”

Section: Introductionmentioning

confidence: 99%

The solid state structure and reactivity of NbCl5·(N,N′-dicyclohexylurea) in solution: evidence for co-ordinated urea dehydration to the relevant carbodiimide

et al. 2010

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NbCl(5) x (N,N'-dicyclohexylurea) 1a owns a distorted octahedral structure due to intramolecular NH...Cl bonding. The unit cell contains four units which are intermolecularly NH...Cl and NH...N bonded. An extended intramolecular network of H-bonding (N-H...Cl, CH...Cl, CH...N) causes the 3D self assembling of the units. Upon addition of base, the HCl release from 1a is observed with the transfer to Nb of the O-atom of the carbonylic function of the starting urea which is converted into the relevant carbodiimide CyN=C=NCy 4. The latter is quantitatively released by adding an excess of NEt(3) at 308 K (py and DBU are less efficient) with formation of the known NbOCl(3)(NEt(3))(2), isolated in quantitative yield. Increasing the temperature leads to a loss in selectivity as the formed DCC undergoes further reactions. At 350 K, the isocyanate CyN=C=O has been isolated in 60% yield besides a mixture of Nb-complexes. DFT calculations have been coupled to IR and NMR experiments for characterizing possible reaction intermediates and the behaviour of 1a. Several other MCl(x) species (ScCl(3), YCl(3), LaCl(3), TiCl(4), TaCl(5), AlCl(3), SnCl(4)) have been shown to be able to co-ordinate DCU but not all of them promote the conversion of urea into DCC.

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Nickel(II) complexes with substituted ureas

Cited by 10 publications

References 6 publications

Some substituted urea and thiourea complexes of Co(II), Mn(II), and Cr(III)

Some substituted urea and thiourea complexes of Co(II), Mn(II), and Cr(III)

Tris(1,3-dimethylurea)diiodidocadmium(II)

The solid state structure and reactivity of NbCl5·(N,N′-dicyclohexylurea) in solution: evidence for co-ordinated urea dehydration to the relevant carbodiimide

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