Some studies in inorganic complexes. XXIII. Reactions of copper(II) with chelating heterocyclic bases

1969 ◽  
Vol 22 (2) ◽  
pp. 373 ◽  
Author(s):  
AR Nicholson ◽  
GJ Sutton
Keyword(s):  
Visible Absorption ◽  
Physical Methods ◽  
Absorption Spectrophotometry ◽  
Metal Metal ◽  
Inorganic Complexes ◽  
Halide Complexes ◽  
Anion Attachment ◽  
Heterocyclic Bases ◽  
First Time ◽  
Solid Complexes

Studies have been made of copper(II) complexes of the ligands 2- aminomethyl-pyridine, 2-methylaminomethylpyridine, 2-aminomethyl-6- methylpyridine, and 2-(2-aminoethyl)pyridine. Various hydrated and anhydrous copper(II) complexes with the anions sulphate, nitrate, halide, and perchlorate were obtained with copper(II) ion to ligand in stoicheiometric ratios of 1 : 1 and 1 : 2 and several instances of water molecule and anion attachment to the coordination sphere are reported. Certain sulphate complexes are considered to be of the bridged type, others have sulphate coordinated to the� copper(II) atom by unidentate attachment, and some of the halide complexes are thought most probably to be dimers based upon double halogen to copper bridging. But there are no instances of bridging by metal-metal bonding between adjacent copper atoms since all magnetic moment values for the copper atoms in the complexes are either normal or only very slightly lower than normal. Physical methods used in the elucidation of structures included measurements of molecular conductances in suitable organic solvents, solubility observations, infrared and visible absorption spectrophotometry, pyrolysis methods, and measurements of magnetic susceptibility. Complex cations in aqueous solution were characterized by visible spectrophotometry. ��� A majority of the solid complexes isolated are described for the first time; where complexes have previously been recorded additional physical investigations have been made.

Some studies in inorganic complexes. XXII. Reactions of nickel(II) with chelating heterocyclic bases

1969 ◽  
Vol 22 (1) ◽  
pp. 59 ◽  
Author(s):  
AR Nicholoson ◽  
GJ Sutton
Keyword(s):  
Aqueous Solution ◽  
Near Infrared ◽  
Mixed Ligand ◽  
Infrared Spectrophotometry ◽  
Heterocyclic Ligands ◽  
Nickel Ion ◽  
Physical Measurements ◽  
Inorganic Complexes ◽  
Heterocyclic Bases ◽  
Solid Complexes

Spin-free six-coordinate complexes of nickel(II) and the heterocyclic ligands 2-aminomethylpyridine, 2-methylaminomethylpyridine, 2-(2- aminoethyl)pyridine, and 2-aminomethyl-6-methylpyridine have been prepared and studied. Various hydrated and anhydrous nickel(II) complexes with the anions sulphate, nitrate, halide, and perchlorate were obtained with nickel ion to ligand stoicheiometric ratios of 1 : 1, 1 : 2, and 1 : 3, and in a number of instances water molecule and anion attachments to the coordination sphere are reported; the sulphate complexes are considered to be of the bridged type. Also, certain mixed-ligand solid complexes and mixed-ligand cationic species in aqueous solution were prepared. Physical measurements used to elucidate structures included molecular conductances in suitable solvents, solubility observations, infrared spectrophotometry, pyrolysis methods, and measurements of magnetic susceptibility. Complex cations in aqueous solution were characterized by visible and near-infrared spectrophotometry.

Studies of metal halides. Magnetic properties of some molybdenum(III) binuclear complex halides

1969 ◽  
Vol 22 (1) ◽  
pp. 121 ◽  
Author(s):  
IE Grey ◽  
PW Smith
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Binuclear Complex ◽  
Magnetic Behaviour ◽  
Metal Halides ◽  
Metal Interaction ◽  
Metal Metal ◽  
Halide Complexes

The variation of magnetic susceptibility with temperature for a number of binuclear halide complexes of molybdenum of formula A3IMo2X9 (A = Cs, Et4N, Et3NH; X = Cl, Br) has been studied over the range 90-400�K. The magnetic behaviour is consistent with that expected for magnetically isolated exchange-coupled pairs of molybdenum atoms. The coupling is interpreted as occurring mainly by direct metal-metal interaction rather than superexchange.

scholarly journals Direct observation of o-benzyne formation in photochemical hexadehydro-Diels–Alder (hν-HDDA) reactions

2020 ◽  
Vol 11 (34) ◽  
pp. 9198-9208 ◽  
Author(s):  
Xiaonan Ma ◽  
Jan Maier ◽  
Michael Wenzel ◽  
Alexandra Friedrich ◽  
Andreas Steffen ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Direct Observation ◽  
Diels Alder ◽  
Visible Absorption Spectrum ◽  
Visible Absorption ◽  
First Time

We report the transient ultraviolet/visible absorption spectrum of an o-benzyne species in solution for the first time.

Modeling of functionally graded materials to estimate effective thermo-mechanical properties

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Royal Madan ◽  
Shubhankar Bhowmick
Keyword(s):  
Experimental Data ◽  
Functionally Graded Materials ◽  
Coefficient Of Thermal Expansion ◽  
Functionally Graded ◽  
Graded Materials ◽  
Content Type ◽  
Wide Range ◽  
Metal Metal ◽  
Novel Material ◽  
First Time

Purpose Functionally graded materials are a special class of composites in which material are graded either continuously or layered wise depending upon its applications. With such variations of materials, the properties of structure vary either lengthwise or thickness wise. This paper aims to investigate models for effective estimation of material properties, as it is necessary for industries to identify the properties of composites or functionally graded materials (FGM’s) before manufacturing and also to develop novel material combinations. Design/methodology/approach Available models were compared for different material combinations and tested with experimental data for properties such as Young’s modulus, density, coefficient of thermal expansion (CTE) and thermal conductivity. Combinations of metal–ceramic and metal–metal were selected such that their ratios cover a wide range of materials. Findings This study reveals different models will be required depending on the material used and properties to be identified. Practical implications The results of the present work will help researchers in the effective modeling of composites or FGM’s for any analysis. Originality/value This paper presents a comparison and review of various analytical methods with experimental data graphically to find out the best suitable method. For the first time, the Halpin-Tsai model was extended in the analysis of the CTE which shows good approximations.

scholarly journals Development and validation of analytical methodology for quantification of total flavonoids of Morus nigra by ultraviolet-visible absorption spectrophotometry

2018 ◽  
Vol 17 (23) ◽  
pp. 724-729
Author(s):  
Alves Sampaio Pedrita ◽  
Andreysa Pereira Teixeira Hyany ◽  
Andrezza Carvalho de Souza Nathalia ◽  
Marcos Teixeira de Alencar-Filho Jose ◽  
Rocha Souza Grasielly ◽  
...  
Keyword(s):  
Total Flavonoids ◽  
Visible Absorption ◽  
Analytical Methodology ◽  
Absorption Spectrophotometry ◽  
Morus Nigra ◽  
Development And Validation

The Infra-Red Absorption Spectra of the Addition Complexes of Quinoline with Copper Salts

1964 ◽  
Vol 19 (3) ◽  
pp. 363-370
Author(s):  
C. S. Williams ◽  
K. F. Fouché
Keyword(s):  
Absorption Spectra ◽  
Copper Salts ◽  
Frequency Shifts ◽  
Infra Red ◽  
Halide Complexes ◽  
First Time

The infra-red spectra of a number of halide, acetate and thiocyanate quinoline and quinolinium complexes of copper have been recorded for the first time. The significance of the frequency shifts of the quinoline bands in the complexes and the influence of the electronegativity of the halide ion on the frequency shifts in the monoquinoline cuprous halide complexes are discussed. Evidence is presented that the Cu (NCS) 2.2 Q complex is probably binuclear.

SYNTHESIS AND CHARACTERIZATION OF DYE (PHENOSAFRANINE) SENSITIZED FLOWER-TYPE ZnO NANORODS

2010 ◽  
Vol 24 (10) ◽  
pp. 1289-1298 ◽  
Author(s):  
N. RAJKUMAR ◽  
R. N. MARIAMMAL ◽  
K. RAMACHANDRAN
Keyword(s):  
Zno Nanorods ◽  
Synthesis And Characterization ◽  
Absorption Analysis ◽  
Photoluminescence Spectra ◽  
Visible Absorption ◽  
Dye Sensitized ◽  
Temperature Solution ◽  
Flower Type ◽  
First Time

Flower-type ZnO nanorods were synthesized by two-step low temperature solution growth and dye-sensitized with phenosafranine for the first time. The scanning electron microscope result shows that the diameter and the length of a single rod of the flower-type nanostructures depend on the method of synthesis. Optical absorption analysis shows a visible absorption at 517 nm, which was otherwise absent in nano ZnO . The photoluminescence spectra of ZnO and dye-sensitized ZnO nano flowers were also analyzed.

Sign in / Sign up

Export Citation Format

Share Document