ABSORPTION SPECTRA AND CONFIGURATION OF SOME AMINE COMPLEXES OF COPPER (II) ACETATE

1966 ◽  
Vol 44 (8) ◽  
pp. 895-898 ◽  
Author(s):  
Gopal Narain
Keyword(s):  
Molecular Weight ◽  
Absorption Spectra ◽  
Coordination Complexes ◽  
Single Band ◽  
Aliphatic Amines ◽  
Conductivity Measurements ◽  
Visible Absorption ◽  
Amine Complexes ◽  
Constituent Elements ◽  
Absorption Measurements

Coordination complexes of copper(II) acetate, ammonia, aliphatic amines, and pyridine have been prepared. Molecular formulae on the basis of percentage of constituent elements were found to be Cu(OAc)2(am)2, where OAc represents acetate ion and am any amine used. Conductivity measurements in nitrobenzene and formamide indicate that the complexes are nonelectrolytes and thus it is suggested that acetate ions are also coordinated. Molecular weight measurements in the same solvents confirm this. Visible absorption measurements in formamide show a single band at about 635 mμ.

Inorganic coordination complexes of manganese(II) phthalimide with primary and secondary aliphatic amines

1967 ◽  
Vol 20 (2) ◽  
pp. 227 ◽  
Author(s):  
G Narain ◽  
P Shukla
Keyword(s):  
General Formula ◽  
Analytical Data ◽  
Coordination Complexes ◽  
Aliphatic Amines ◽  
Conductivity Measurements ◽  
Visible Absorption

A series of complexes of manganese(II) phthalimide with aliphatic amines has been prepared. The general formula Mn(C8H4O2N)2(amine)4 is indicated by the analytical data. Conductivity measurements in nitrobenzene indicate the complexes to be non-electrolytes. Infrared and visible absorption spectrophotometric measurements have been made and a possible interpretation of the data has been presented.

Coordination complexes of amino acids: Preparation and properties of some Amino-acidatobis(acetylacetonato)cobalt(III) and Bis(amino-acidato)(acetylacetonato)cobalt(III) complexes

1968 ◽  
Vol 21 (3) ◽  
pp. 679 ◽  
Author(s):  
SH Laurie
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Absorption Band ◽  
Absorption Spectra ◽  
Coordination Complexes ◽  
Optically Active ◽  
Ultraviolet Absorption ◽  
Visible Absorption ◽  
Molecular Weights ◽  
Cotton Effects

Complexes of the type [Co(acac)2(aa)] have been synthesized, in which the amino acid is DL- and L-phenylalanine, L-valine, L-leucine, L-proline, DL-, L-,and D-alanine, and glycine. The complexes were characterized by means of analyses, molecular weights, and their infrared, visible, and ultraviolet absorption spectra. During the syntheses several of the bis(amino-acidato) complexes, [Co(acac)(aa)2], were also formed; the L-phenylalanine and glycine complexes were isolated and characterized. The complexes prepared from the optically active amino acids exhibited Cotton effects in the region of the visible absorption band (lA1g, + 1T1g). These effects have been attributed to induced asymmetry rather than stereoselectivity. Amino acids of the same configuration gave rise to Cotton effects of the same sign, ie. (-)590-[Co(acac)2(L-aa)], (-)6590-[Co(acac)(L-aa)2], and (+)590-[Co(acac),(D-aa)].

The polymeric nature of Bis(acetylacetonato)-, Bis(trifluoroacetylacetonato)-, Bis(hexafluoroacetylacetonato)-, and Bis(2,2,6,6-tetramethylheptane-3,5-dionato)-iron(II)

1967 ◽  
Vol 20 (2) ◽  
pp. 281 ◽  
Author(s):  
DA Buckingham ◽  
RC Gorges ◽  
JT Henry
Keyword(s):  
Molecular Weight ◽  
Absorption Spectra ◽  
Visible Absorption ◽  
Polymeric Nature ◽  
Weight Data

The preparations of bis(acetylacetonato)iron(II), Fe aca2; bis(trifluoroacetylacetonato)iron(II), Fe tfa2; bis(hexafluoroacetylacetonato)iron(II), Fe hfa2; and bis(2,2,6,6- tetramethylheptane-3,5-dionato)iron(II), Fe dpm2, are described. Cryoscopic and ebullioscopic molecular weight measurements show that these complexes are monomeric in dilute benzene solutions. Fe aca2 approaches a hexamer at 5� in concentrated benzene solutions, with Fe tfa2 and Fe hfa2 having maximum polymerization numbers of 1.63 and 1.5 respectively. Visible absorption spectra support the molecular weight data. Powder photographs show that Fe dpm2 is a tetrahedral monomer and that Fe tfa2 and Fe hfa2 are isomorphous.

Coordination compounds of substituted 1,10-phenanthrolines and related dipyridyls. X. Complexes of iron, cobalt, and nickel, and 4,6,4',6'-Tetramethyl-2,2'-bipyridine

1966 ◽  
Vol 19 (2) ◽  
pp. 201 ◽  
Author(s):  
JR Hall ◽  
MR Litzow ◽  
RA Plowman
Keyword(s):  
Magnetic Susceptibility ◽  
Absorption Spectra ◽  
Coordination Compounds ◽  
Conductivity Measurements ◽  
Visible Absorption ◽  
Iron Cobalt ◽  
Cobalt And Nickel

The following complexes of 4,6,4',6'-tetramethyl-2,2'-bipyridine (tmb) have been prepared: MCl2 tmb, where M = Fe, Co, and Ni; M(NO3)2 tmb,H2O, where M = Fe and Co; [CoNO3 tmb2]ClO4; and Ni tmb2 (NO3)2,H2O. The structures of these compounds have been determined, as far as possible, by means of magnetic susceptibility and conductivity measurements, and by studies of their infrared and visible absorption spectra.

NIR and Upconversion Luminescence Properties of Nd3+ Doped in Gd2O3-CaO-SiO2-B2O3 Glass System

2014 ◽  
Vol 548-549 ◽  
pp. 124-128 ◽  
Author(s):  
S. Insiripong ◽  
S. Kaewjeang ◽  
U. Maghanemi ◽  
H.J. Kim ◽  
N. Chanthima ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Upconversion Luminescence ◽  
Emission Spectra ◽  
Concentration Quenching ◽  
Luminescence Spectra ◽  
Optical Absorption Spectra ◽  
Glass Matrices ◽  
Nir Luminescence

In this work, properties of Nd3+ in Gd2O3-CaO-SiO2-B2O3 glass systems with composition 25Gd2O3-10CaO-10SiO2-(55-x)B2O3-xNd2O3 where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol% were investigated. The optical absorption spectra show peaks at 4F3/2 (877 nm) , 4F5/2+2H9/2 (802 nm), 4F7/2+4S3/2 (743 nm), 4F9/2 (682 nm), 2H11/2 (627 nm), 2G7/2 +4G5/2 (582 nm), 4G7/2 +2K13/2 (527 nm), 4G11/2 (481 nm), 2P1/2 (427 nm) and 2L15/2 + 4D1/2 + 1I11/2+ 4D5/2+ 4D3/2 (355 nm) reflecting the Nd3+ ions in glass matrices. The densities were increased with increasing of Nd2O3 concentration. This indicates the increase of the molecular weight by the replacement of B2O3 with a heavier Nd2O3 oxide in the glass. The upconversion luminescence spectra show bands at 393 nm for all Nd2O3 concentration and the strongest intensity from 2.5 % mol of Nd2O3 was obtained. For NIR luminescence, the intensity of Nd3+ emission spectra increases with increasing concentrations of Nd3+ up to 1.5 mol% and beyond 1.5 mol% the concentration quenching is observed.

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