α-PYRIDONE COMPLEXES AND THEIR INFRARED SPECTRA

1965 ◽  
Vol 43 (4) ◽  
pp. 741-748 ◽  
Author(s):  
Denys Cook
Keyword(s):  
Complex Formation ◽  
Carbonyl Group ◽  
Infrared Spectra ◽  
Lewis Acids ◽  
Lewis Acidity

The infrared spectra of complexes of 1-methyl-2-pyridone and 1-methyl-2-quinolone with Lewis acids are consistent with interaction at the carbonyl group. The stretching frequency of this group, vco, is lowered on complex formation, the change being proportional to the Lewis acidity. Two other bands, at 1 670 and 1 380 cm−1 move to lower frequency in much smaller steps and are associated with ring modes.

INFRARED SPECTRA OF 2,6-DIMETHYL-4-PYRONE COMPLEXES

1961 ◽  
Vol 39 (6) ◽  
pp. 1184-1189 ◽  
Author(s):  
Denys Cook
Keyword(s):  
Complex Formation ◽  
Oxygen Atom ◽  
Carbonyl Group ◽  
Lewis Acid ◽  
Frequency Band ◽  
Infrared Spectra ◽  
Donor Site ◽  
Carbonyl Oxygen ◽  
Acid Strength ◽  
Group A

The infrared spectra of 2,6-dimethyl-4-pyrone in solution, and in complexes with HgCl2, ZnCl2, BF3, SbCl5, and HBr have been recorded. A band at 1639 cm−1 in the free pyrone moves to progressively lower frequencies in the complexes as the Lewis acid strength increases, identifying this band as the carbonyl stretching frequency and the donor site as the carbonyl group. A higher-frequency band, at 1678 cm−1 in the free pyrone, moves to lower frequency on complex formation, but to a much smaller extent, and is to be identified with a stretching mode of the ring. The site of protonation in 2,6-dimethyl-4-pyrone salts has been unequivocally shown to be the carbonyl oxygen atom.

INFRARED SPECTRA OF COMPLEXES OF 4-PYRIDONES

1963 ◽  
Vol 41 (2) ◽  
pp. 515-521 ◽  
Author(s):  
Denys Cook
Keyword(s):  
Nitrogen Atom ◽  
Carbonyl Group ◽  
Lewis Acid ◽  
Infrared Spectra ◽  
Lewis Acids ◽  
Donor Site ◽  
Acid Strength ◽  
Ring Mode ◽  
Lower Frequencies

The infrared spectra of many complexes of Lewis acids with some 4-pyridones have been recorded. Large shifts to lower frequencies of about 100 cm−1 have been observed in a band near 1560 cm−1 as the Lewis acid strength increased. Much smaller shifts of about 5 to 10 cm−1 in a band near 1640 cm−1 were noted. The former band has therefore been designated as the carbonyl frequency, and the latter as a ring mode involving CC stretching.The donor site of 4-pyridones is therefore the carbonyl group, and not the nitrogen atom. Protonated 4-pyridones have similar spectra, and are consistent with O-, not N-protonation.

ChemInform Abstract: Strong Lewis Acids of Air-Stable Metallocene Bis(perfluorooctanesulfonate)s as High-Efficiency Catalysts for Carbonyl-Group Transformation Reactions.

ChemInform ◽  
2012 ◽  
Vol 43 (41) ◽  
pp. no-no
Author(s):  
Renhua Qiu ◽  
Xinhua Xu ◽  
Lifeng Peng ◽  
Yalei Zhao ◽  
Ningbo Li ◽  
...  
Keyword(s):  
Carbonyl Group ◽  
Lewis Acids ◽  
High Efficiency ◽  
Group Transformation

ChemInform Abstract: INTERACTION OF CYCLOPENTADIENYL CARBONYL PHOSPHINE COMPLEXES OF MANGANESE WITH LEWIS ACIDS, INFRARED SPECTRA

1973 ◽  
Vol 4 (47) ◽  
pp. no-no
Author(s):  
A. G. GINZBURG ◽  
B. V. LOKSHIN ◽  
V. N. SETKINA ◽  
D. N. KURSANOV
Keyword(s):  
Infrared Spectra ◽  
Lewis Acids ◽  
Phosphine Complexes

Thio derivatives of β-diketones and their metal chelates. XXIII. Adducts of nickel(II) chelates of fluorinated Monothio-β-diketones with nitrogen heterocycles

1976 ◽  
Vol 29 (6) ◽  
pp. 1209 ◽  
Author(s):  
SE Livingstone ◽  
JH Mayfield ◽  
DS Moore
Keyword(s):  
Carbonyl Group ◽  
Infrared Spectra ◽  
Nitrogen Heterocycles ◽  
Metal Chelates ◽  
Derivatives Of

Paramagnetic adducts of the nickel(11) chelates of the fluorinated monothio-β-diketones RC(SH)=CHCOCF3 (R = β-naphthyl, p-ClC6H4, m-ClC6H4, m-BrC6H4, m-MeC6H4, 3,4-Cl2C6H3) have been obtained with pyridine, y-picoline, 2,2'-bipyridyl, and 1,l0-phenanthroline. They are of the type NiL2(base)2 (L = RCS=CHCOCF3; base = py, γpic, �bpy, �phen). With 2,2',2"-terpyridyl two types of adduct were isolated: (a) mononuclear NiL2(trpy) and (b) trinuclear Ni3L6(trpy)2. The infrared spectra of all the adducts display v(C-O) in the range 1552-1580 cm-l; this band is characteristic of a bidentate monothio-β-diketonato ligand. The spectra of the mononuclear terpyridyl adducts display in addition a v(C=O) band at c. 1650 cm-1, indicating that one carbonyl group is not coordinated.

scholarly journals Solid-State Synthesis, Characterization, and Biological Activity of the Bioinorganic Complex of Aspartic Acid and Arsenic Triiodide

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Guo-Qing Zhong ◽  
Wen-Wei Zhong ◽  
Rong-Rong Jia ◽  
Yu-Qing Jia
Keyword(s):  
Crystal Structure ◽  
Biological Activity ◽  
Solid State ◽  
Complex Formation ◽  
Aspartic Acid ◽  
Infrared Spectra ◽  
Room Temperature ◽  
Biological Test ◽  
Bridge Structure ◽  
Monoclinic System

The bioinorganic complex of aspartic acid and arsenic triiodide was synthesized by a solid-state reaction at room temperature. The formula of the complex is AsI3[HOOCCH2CH(NH2)COOH]2.5. The crystal structure of the complex belongs to monoclinic system with lattice parameters:a=1.0019 nm,b=1.5118 nm,c=2.1971 nm, andβ=100.28°. The infrared spectra can demonstrate the complex formation between the arsenic ion and aspartic acid, and the complex may be a dimer with bridge structure. The result of primary biological test indicates that the complex possesses better biological activity for the HL-60 cells of the leukemia than arsenic triiodide.

1-Iodoacétylènes. IV. Relations structure–réactivité pour la complexation des 1-iodoacétylènes substitués avec des bases de Lewis

1983 ◽  
Vol 61 (1) ◽  
pp. 135-138 ◽  
Author(s):  
Christian Laurence ◽  
Michèle Queignec-Cabanetos ◽  
Bruno Wojtkowiak
Keyword(s):  
Complex Formation ◽  
Triple Bond ◽  
Vibrational Frequency ◽  
Chemical Shifts ◽  
Structural Parameters ◽  
Equilibrium Constants ◽  
Lewis Acidity ◽  
Frequency Shifts ◽  
Substituent Constants ◽  
Substituted 1

The equilibrium constants for complex formation between the substituted 1-iodoacetylènes 1–8 and the vibrational frequency shifts induced by complex formation are related to the electronic substituent constants. The 13C chemical shifts of the triple bond are also useful structural parameters for predicting the Lewis acidity of iodoalkynes.

Halogeno-und Pseudohalogeno-tris(pentahaptocyclopentadienyl)uran(IV)- Komplexe als Lewis-Säuren: Darstellung und Struktur trigonal-bipyramidaler Uran-Organyle des Typs [(η5 -C5H5)3UXL] / Tris(pentahaptocyclopentadienyl)uranium(IV) Halides and Pseudohalides as Lewis-Acids: Preparation and Structure of Uranium Organyls [(η5 -C5H5)3UXL] with Trigonal-Bipyramidal Coordination

1978 ◽  
Vol 33 (12) ◽  
pp. 1393-1397 ◽  
Author(s):  
R. D. Fischer ◽  
E. Klähne ◽  
J. Kopf
Keyword(s):  
Structure Analysis ◽  
Lewis Acids ◽  
Lewis Base ◽  
Lewis Acidity ◽  
X Ray ◽  
Trigonal Bipyramidal Coordination ◽  
Trigonal Bipyramidal ◽  
Linear Alignment ◽  
Specific Reactions

Abstract The first two examples of a novel series of organo-actinide complexes, [Cp3UXL] (Cp = η5 -C5H5, X = halide or pseudohalide anion, L = uncharged Lewis base), are described. The X-ray structure analysis of the system with X = NCS and L = CH3CN confirms an almost linear alignment (H3)CCNUNCS along with the coplanarity of the three Cp ring normals. The remarkable Lewis acidity of certain Cp3UX-compounds appears to be essential for the formation of oligomeric species [Cp3UX]∞ as well as for specific reactions of monomeric CP3UX.

THE PREPARATION OF SOME THIOSEMICARBAZONES AND THEIR COPPER COMPLEXES. PART I

1960 ◽  
Vol 38 (5) ◽  
pp. 712-719 ◽  
Author(s):  
B. A. Gingras ◽  
R. W. Hornal ◽  
C. H. Bayley
Keyword(s):  
Complex Formation ◽  
Aromatic Aldehyde ◽  
Infrared Spectra ◽  
Copper Complexes ◽  
Chemical Evidence

A number of thiosemicarbazones and their 1:1 copper complexes are described and the possible structures of the latter are discussed. Formation of copper complexes from aromatic aldehyde and ketone thiosemicarbazones results in a loss of one H atom as indicated by infrared spectra. In the aliphatic series, no loss of H atom is apparent upon complex formation. It is reasonable to assume that different processes are involved resulting in two possible structures for the aromatic and the aliphatic copper complexes. Some chemical evidence supports this view.

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