Infrared Spectra of Metal Chelate Compounds. II. Infrared Spectra of Acetylacetonates of Trivalent Metals 1

Chemical shift data and conductivities of acetylacetonates of some group IA, IlA, and lIIA metals in dimethylsulfoxide are recorded. I t is concluded that nuclear magnetic resonance spectra cannot give definite information on T-bonding in these complexes, though the results for the group 111 elements are consistent with the presence of such bonds, as is the evidence from related spectroscopic studies.

Section: Nz~clear Magnetic Resonancementioning

confidence: 81%

Nuclear Magnetic Resonance Spectra and Conductivities of Some Metal Acetylacetonates

Carty¹,

Tuck²,

Bullock³

1965

“…Other regions of the infrared spectra were generally less informative; however, there are features in the 450-600 cm-' region, where angle bending modes of the C,P02 groups normally occur (13,(16)(17)(18)(19)(20)(21), which also group the P forms with the butyl and hexyl derivatives. These compounds all exhibit two relatively strong bands around 555 and 520 cm-' with differing numbers of weaker bands depending on R. The a forms also exhibit two relatively strong bands but at higher frequencies (-585 and 550 cm-I), as well as a number of weaker bands depending on R. In this instance the ethyl derivative is somewhat unique, exhibiting two medium intensity absorptions at lower energy than observed in the P forms (2).…”

Section: Infrared Spectramentioning

confidence: 99%

Magnetic concentration and polymorphism in di-n-octyl-, di-n-decyl-, and di-n-dodecylphosphinates of copper(II)

Haynes¹,

Oliver²,

Thompson³

1985

. Can. J. Chem. 63, I1 l l (1985). Phosphinates of copper(l1) of the type C U ( R~P O~)~ where R is n-octyl, n-decyl, and n-dodecyl have been synthesized and characterized by differential scanning calorimetry, vibrational and electronic spectroscopy, and variable temperature (300 to 4.2 K) magnetic susceptibility studies. Each of these compounds was obtained in distinct a and P structural forms. All materials appear to have the double phosphinate bridged extended chain structure and the magnetic data have been successfully analyzed according to the isotropic Heisenberg model for linear chains. The a forms exhibit antiferromagnetic behaviour with J values of -25, -29, and -29 cm-' for the octyl, decyl, and dodecyl derivatives respectively. The P forms are ferromagnetic and have corresponding J values of 1.8, 2

“…The weak band in the region 40W75 cm-' (for which there are no corresponding ligand bands) is assigned to pure Fe-0 stretching vibration. Nakamoto et al (18,19) also observed a weak band for M-0 stretching frequency and gave the assignment for this band in the region 430490 cm-l. The band in the region 538-585 cm-l has been assigned as a combination band of metaloxygen stretching frequency and C-C bending vibration (18,19), or 0-C-0 bending (34), or N-C-0 bending (16).…”

Section: Infrared Study Amide Complexesmentioning

confidence: 90%

Reactions of iron carbonyls with various ligands in the presence of chloroform. A new method for the preparation of iron halide complexes

Singh¹,

Rivest²

1968

Iron halidecomplexes ofthe type FeCI2.2L (L = CH3CONH2, HCONH2, HCONHCH3) and FeC13.L (L = (C6HS)3P, (C6H5)3A~, CsH5NH2, C6H5CONH2) have been prepared by the reaction of iron carbonyls with various ligands in chloroform as solvent. The mechanism of the reaction and the effect of other solvents have also been studied. The magnetic susceptibility measurements and infrared spectral study (4000-200 cm-') suggest that these complexes have tetrahedral configuration. The possible site of bonding in ligands and infrared assignments for Fe-0, Fe-Cl, Fe-N, Fe-P, Fe-As bands have been given. The relative Fe-0 bond strengths in various amide complexes have been determined on the basis of metal-oxygen stretching frequency and of shifts in carbonyl stretching frequency.