Some Studies in Inorganic Complexes. V. Mercury(II)

1959 ◽  
Vol 12 (4) ◽  
pp. 637 ◽  
Author(s):  
GJ Sutton
Keyword(s):  
Molecular Weight ◽  
Absorption Spectra ◽  
Ultra Violet ◽  
Inorganic Complexes

A study has been made of mercury(II) complexes of ethylenediamine, 1,10-phenanthroline, and 2,2'-dipyridyl. By means of conductance and molecular weight measurements it has been shown that complexes of the type HgX2.B and HgY.B, in which B is the base, X is halogen or nitrite, and Y is oxalate or sulphate, are 4-covalent non-electrolytes. The absorption spectra of the halogen complexes in the near ultra-violet range are characteristic of the chelate with a shift of absorption to longer wavelengths. Bisphenanthroline and bisdipyridyl complexes of mercury(II) were also investigated.

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.

The ultra-violet absorption spectra of some methyl-substituted benziminazoles

1951 ◽  
Vol 4 (5) ◽  
pp. 338-347 ◽  
Author(s):  
G.H. Beaven ◽  
E.R. Holiday ◽  
E.A. Johnson
Keyword(s):  
Absorption Spectra ◽  
Ultra Violet

Some studies in inorganic complexes. XXV. Cobalt(II) and nickel(II) complexes of 2-Acetamidopyridine and 2-Aminomethyl-6-rnethylpyridine, and the cobalt(II) complex of 2-Methylpyridine-6-carboxylic acid

1969 ◽  
Vol 22 (9) ◽  
pp. 1841 ◽  
Author(s):  
KH Shaw ◽  
GJ Sutton
Keyword(s):  
Magnetic Properties ◽  
Carboxylic Acid ◽  
Absorption Spectra ◽  
Infrared Spectra ◽  
Reflectance Spectra ◽  
Inorganic Complexes

Complexes of cobalt(II) and nickel(II) with the ligands 2- acetamidopyridine (acpy) and 2-aminomethyl-6-methylpyridine (mepic) have been prepared and studied. They included [Co(acpy)2X2], [Co(mepic)2X2], [Ni(acpy)2X2], and [Ni-(mepic)2X2], in which X is Cl, Br, I, or NCS; [Co(acpy)2(NO3)2], [Co(mepic)2(NO3)2], [Ni(acpy)2(NO3)2], [Ni(mepic)3NO3]NO3, [Co(acpy)3](ClO4)2, [Co(mepic)3](ClO4)2, [Co(mepic)3](CoCl4), [Ni(acpy)2(H2O)2](ClO4)2, and [Ni(mepic)2(H2O)2](ClO4)2. The inner complex of 2-methylpyridine-6- carboxylic acid [Co(mepiac)2,2H2O)] was also isolated. In all cases, the magnetic properties, conductances, reflectance spectra, absorption spectra, and infrared spectra are in agreement with the concept that they are spin-free, six-coordinate octahedral complexes. The substance [Ni(mepic)2NO3]NO3 contains both bidentate and ionic nitrate.

Melting and crystal structure: association in nitrate melts

1965 ◽  
Vol 285 (1401) ◽  
pp. 263-274 ◽  
Keyword(s):  
Absorption Spectra ◽  
Freezing Point ◽  
Ultra Violet ◽  
Linear Variation ◽  
Univalent Cations ◽  
Electrical Conductivities ◽  
Alkaline Earths ◽  
Linear Effects ◽  
Nitrate Anions ◽  
Structure Association

By using various mixtures, properties of molten nitrates can be studied at temperatures well below the freezing points of any pure nitrates of alkalis or alkaline earths. Molar volumes, viscosities, electrical conductivities and ultra-violet absorption spectra have been investigated in this way for mixed nitrate melts down to 140°C. For a typical pair of uni-univalent cations, such as potassium and sodium, each of these properties shows practically linear variation for all mixtures down to the lowest temperatures studied. On the other hand, cations such as calcium with a higher polarizing power cause marked deviations from linearity in transport properties and absorption spectra in certain mixtures. However, even in such mixtures no excess volume is found, and temperature variation of the molar volume remains linear. Effects observed are discussed in terms of the closest approach between cations and the nitrate anions in these melts. As the temperature falls, there appears to be progressive formation of regions of increased packing density in the melt and corresponding irregular voids. These more densely packed regions may be termed ‘clusters’ or ‘associated’ groups of ions. Although probably smaller, such transient clusters have analogies with ‘flickering clusters’ proposed in some models for water near its freezing point.

Ultra-violet Absorption Spectra of the Diazines

Nature ◽  
1960 ◽  
Vol 187 (4736) ◽  
pp. 500-501 ◽  
Author(s):  
K. KEITH INNES ◽  
JAMES A. MERRITT ◽  
WAYNE C. TINCHER ◽  
SHELBY G. TILFORD
Keyword(s):  
Absorption Spectra ◽  
Ultra Violet
Sign in / Sign up

Export Citation Format

Share Document