Infrared spectra of transition metal complexes of pentamethylenetetrazole

1967 ◽  
Vol 6 (8) ◽  
pp. 1591-1594 ◽  
Author(s):  
Frank M. D'Itri ◽  
Alexander I. Popov
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Infrared Spectra

Synthesis and infrared spectra of some transition metal complexes of α-amino acid esters

1967 ◽  
Vol 20 (4) ◽  
pp. 675 ◽  
Author(s):  
RW Hay ◽  
LJ Porter
Keyword(s):  
Amino Acid ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Infrared Spectra ◽  
Metal Ion ◽  
Amino Acid Esters ◽  
Visible Spectra ◽  
Metal Ratio ◽  
Acid Esters

A variety of transition metal complexes of a-amino acid esters have been synthesized, and characterized by analysis, conductivity measurements, and infrared spectra. The complexes can be broadly divided into two groups: (a) complexes in which only a metal-nitrogen bond occurs with the α-amino group of the ester, and (b) complexes in which chelate ring formation occurs via secondary donor groups on the ligand. These latter complexes are found with methyl L-histidinate, methyl γ-glutamate, and methyl L-cysteinate. With the exception of a methyl tryptophanate complex, the infrared spectra show that there is no interaction between the carbonyl group of the ester and the metal ion. The visible spectra of aqueous solutions of the esters and copper(II) at a ligand/metal ratio of 5 : 1 have maxima in the 600-650 mμ range at pH 7 consistent with copper-nitrogen bonding only.

Carboxylic Esters as Ligands. II. Transition metal complexes of Diethyl Acetonedicarboxylate, Ethyl Acetoacetate, and Diethyl oxaloacetate

1967 ◽  
Vol 20 (9) ◽  
pp. 1829 ◽  
Author(s):  
RW Hay ◽  
BP Caughley
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Schiff Bases ◽  
Transition Metal Complexes ◽  
Infrared Spectra ◽  
Ethyl Acetoacetate ◽  
Magnetic Moments ◽  
Magnetic Data ◽  
Keto Esters ◽  
Metal Metal

The preparation, infrared spectra, magnetic data, and reactions of a variety of transition metal complexes of diethyl acetonedicarboxylate are described. The infrared spectra indicate chelate ring formation with a metal-oxygen bond with the carbonyl group of the ester. Transesterification reactions with alcohols occur much less readily with these complexes than with the corresponding metal oxaloacetates. Bis(ethyl acetoacetato)copper(II) undergoes methanolysis rather than trans-esterification on refluxing with methanol to give a bright blue methoxy-bridged polymer with an abnormally low magnetic moment (μeff 1.14 B.M. at 17�), presumably indicating metal-metal interaction. The magnetic moments of various transition metal complexes of ethyl acetoacetate and diethyl oxaloacetate have also been determined. The β-keto esters have been condensed with 1,2-diaminoethane to give N,N?-bis Schiff bases which exist predominantly as the enamine tautomer in the solid state and in solution. Attempts to prepare copper(II) complexes of these Schiff bases in aqueous ethanol have been unsuccessful as the ligands rapidly hydrolyse in the presence of copper(II) ions.

scholarly journals On the Infrared Spectra of Transition Metal Complexes of the Thiocyanate Ion in Pyridine.

1965 ◽  
Vol 19 ◽  
pp. 47-52 ◽  
Author(s):  
Ragnar Larsson ◽  
Atis Miezis ◽  
A. Kjekshus ◽  
Salo Gronowitz ◽  
Ragnar A. Hoffman ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Infrared Spectra ◽  
Thiocyanate Ion

Transition metal complexes of 1-substituted tetrazoline-5-thiones

1967 ◽  
Vol 45 (10) ◽  
pp. 1057-1062 ◽  
Author(s):  
Umesh Agarwala ◽  
V. A. Narayan ◽  
S. K. Dikshit
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Infrared Spectra ◽  
Gravimetric Determination ◽  
Analytical Applications

Transition metal complexes of a number of 1-substituted tetrazoline-5-thiones have been prepared and their infrared spectra examined in the 3 600 – 500 cm−1 region. The analytical applications of 1-substituted tetrazoline-5-thiones for the gravimetric determination of cadmium and palladium have been studied.

Transition metal complexes of diethyl Cyclopentanone-2,5-diglyoxylate

1969 ◽  
Vol 22 (3) ◽  
pp. 505 ◽  
Author(s):  
DP Graddon ◽  
IT Townsend
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Infrared Spectra ◽  
Near Infrared ◽  
Carbonyl Groups ◽  
Heterocyclic Base ◽  
Spin Configuration ◽  
Molecular Weights ◽  
Near Infrared Spectra

Diethyl cyclopentanone-2,5-diglyoxylate (ecgH2; IV) forms complexes of the type M(ecg)Bn with divalent transition metals, where M = Mn, Fe, Co, Ni, Cu, Zn; B = H2O or a heterocyclic base, and n = 1 (when M = Cu) or n = 2 (M = others). All complexes have the high-spin configuration. Infrared spectra show the presence of chelate β-diketone rings and free carbonyl groups. Visible and near-infrared spectra support octahedral stereochemistry for the nickel(II) and cobalt(II) complexes. Molecular weights show the complexes to be dimeric. These results are consistent with an oxygen-bridged structure, M2L2B2n, in which base molecules are added above and below a planar M2L2 unit (VI).

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