Conductivity Studies of Schiff Base Ligands Derived from O-Phenylenediamine and Their Co(II) and Zn(II) Complexes

2015 ◽  
Vol 12 (2) ◽  
pp. 13
Author(s):  
Muhamad Faridz Osman ◽  
Karimah Kassim
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Schiff Base ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Impedance Spectroscopy ◽  
Ftir Spectroscopy ◽  
Coordination Complexes ◽  
Frequency Range ◽  
Schiff Base Ligands

The coordination complexes of Co(II) and Zn(II) with Schiff bases derived from o-phenylenediamine and substituted 2-hydroxybenzaldehyde were prepared All compounds were characterized by Fourier transform infrared (FTIR) spectroscopy and Nuclear magnetic resonance (NMR) spectroscopy elemental analyzers. They were analyzed using impedance spectroscopy in the frequency range of 100Hz-1 MHz. LI and L2 showed higher conductivity compared to their metal complexes, which had values of 1.3 7 x 10-7 and 6.13 x 10-8 S/cm respectively. 

Conductivity Studies of Schiff Base Ligands Derived from O-Phenylenediamine and Their Co(II) and Zn(II) Complexes

2015 ◽  
Vol 12 (2) ◽  
pp. 13
Author(s):  
Muhamad Faridz Osman ◽  
Karimah Kassim
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Schiff Base ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Impedance Spectroscopy ◽  
Coordination Complexes ◽  
Frequency Range ◽  
Schiff Base Ligands ◽  
L1 And L2

The coordination complexes of Co(II) and Zn(II) with Schiff bases derived from o-pheny/enediamine and substituted 2-hydroxybenza/dehyde were prepared All compounds were characterized by Fourier transform infrared (FTIR) spectroscopy and Nuclear magnetic resonance (NMR.) spectroscopy elemental analyzers. They were analyzed using impedance spectroscopy in the frequency range of 100 Hz - 1 MHz. L1 and L2 showed higher conductivity compared to their metal complexes, which had values of 1.3 7 x 10-7 and 6.13 x 10-8 S/cm respectively.

Structure of poorly-ordered aluminosilicates

Clay Minerals ◽  
1986 ◽  
Vol 21 (5) ◽  
pp. 879-897 ◽  
Author(s):  
M. A. Wilson ◽  
S. A. McCarthy ◽  
P. M. Fredericks
Keyword(s):  
Electron Microscopy ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Ftir Spectroscopy ◽  
Driving Forces ◽  
Repulsive Forces

AbstractThe structure of synthetic aluminosilicates prepared at pH 6 has been investigated by 29Si and 27Al high-resolution solid-state nuclear magnetic resonance (NMR) spectroscopy. Fourier transform infrared (FTIR) spectroscopy and electron microscopy have also been used to characterize the products. The amount of Si and Al in protoimogolite, disordered allophane and other structures has been measured. There is a fair correlation between the intensity of the 349 cm−1 band in the FTIR spectra and the proportion by weight of protoimogolite Si measured by NMR. It is shown that disordered allophanes have similar structures to those proposed by van Reeuwijk and de Villiers (Soil Sci. Soc. Am. Proc. 32 (1968) 238–240), i.e. octahedral Al surrounding a tetrahedral core. Moreover, it is clear that at high Al:Si ratios (⩾1:1), protoimogolite can compete with disordered allophane precursors for aluminum. The driving forces for formation of protoimogolite rather than allophane appear to be long range Al-Al repulsive forces through oxygen.

Characterization of a Polyanhydride Series by Ftir

1993 ◽  
Vol 331 ◽  
Author(s):  
Mark R. Kreitz ◽  
Kathleen J. Pekarek ◽  
Edith Mathiowitz
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Ftir Spectroscopy ◽  
Powder Diffraction ◽  
Sebacic Acid ◽  
X Ray ◽  
Fingerprint Region

AbstractUsing Fourier-transform infrared (FTIR) spectroscopy we have characterized a polyanhydride copolymer series composed of various ratios of the diacids 1,3-bis(p -carboxyphenoxy)propane (CPP) and sebacic acid (SA). Typical peaks corresponding to the aliphatic-aliphatic (SA-SA), aromatic-aliphatic (CPP-SA), and aromatic-aromatic (CPP-CPP) diads were found in the 1820- 1710 cm−1 wavenumber range. Further peaks corresponding to the SA-SA diads were identified in the fingerprint region at 1382, 1360, 1307, and 1286 cm−1. These peak characterizations facilitate identification of bond distribution in the CPP-SA copolymer as well as other polyanhydride copolymers, and correlate well with previously presented information obtained with nuclear magnetic resonance (NMR) spectroscopy and X-ray powder diffraction.

Synthesis and Characterization of Some Dibasic Tridentate Schiff Base Ligands

1975 ◽  
Vol 53 (6) ◽  
pp. 939-944 ◽  
Author(s):  
Elmer C. Alyea ◽  
Abdul Malek
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Schiff Base ◽  
Magnetic Resonance ◽  
Synthesis And Characterization ◽  
Mass Spectral Data ◽  
Schiff Base Ligands ◽  
Mass Spectral ◽  
Structural Formulas ◽  
Tridentate Schiff Base

The synthesis and characterisation of several dibasic tridentate Schiff base ligands (H2SB) are described. Structural formulas for the isolated ligands are suggested on the basis of infrared, nuclear magnetic resonance, and mass spectral data.

scholarly journals Fourier Transform Infrared and Solid State 13C Nuclear Magnetic Resonance Spectroscopic Characterization of Defatted Cottonseed Meal-Based Biochars

2021 ◽  
Vol 15 (1) ◽  
pp. 108
Author(s):  
Zhongqi He ◽  
Mingxin Guo ◽  
Chanel Fortier ◽  
Xiaoyan Cao ◽  
Klaus Schmidt-Rohr
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Cottonseed Meal ◽  
Pyrolysis Temperature ◽  
Fourier Transform Infrared ◽  
13C Nuclear Magnetic Resonance ◽  
Ft Ir

Conversion to biochar may be a value-added approach to recycle defatted cottonseed meal, a major byproduct from the cotton industry. In this work, complete slow pyrolysis at seven peak temperatures ranging from 300 to 600°C in batch reactors was implemented to process cottonseed meal into biochar products. Elemental analysis, attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy and quantitative solid state 13C nuclear magnetic resonance (NMR) spectroscopy were applied to characterize raw meal and its derived biochar products. The biochar yield and organic C and total N recoveries decreased as the peak pyrolysis temperatures was elevated. However, most of the mineral elements including P in cottonseed meal were retained during pyrolysis and became enriched in biochar as a result of the decreased mass yield. The spectral data showed that pyrolysis removed the functional groups of biopolymers in cottonseed meal, producing highly aromatic structures in biochars. With increasing pyrolysis temperature, alkyl structures decreased progressively in the biochar products and became negligible at higher temperatures (550 and 600°C). Quantitative analysis of FT IR data revealed that the values of a simple 3-band (1800,1700, and 650 cm-1)-based R reading of the biochars were linearly related to the pyrolysis temperature, and showed strong correlations with decreasing aromaticity and increasing alkyl, aliphatic C-O/N and carbonyl signal intensities in the 13C NMR spectra. Therefore, the cheaper and faster FT-IR measurement could be used as a routine conversion indicator of pyrolysis of lignocellulosic biomass instead of the more expensive and time-consuming NMR spectroscopy.

Synthesis and studies of electrochemical properties of lophine derivatives

RSC Advances ◽  
2014 ◽  
Vol 4 (97) ◽  
pp. 54740-54746 ◽  
Author(s):  
A. Hariharasubramanian ◽  
Y. Dominic Ravichandran
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Liquid Chromatography ◽  
Infrared Spectroscopy ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Electrochemical Properties ◽  
Fourier Transform Infrared Spectroscopy ◽  
Liquid Chromatography Mass Spectrometry

A versatile series of lophine derivatives (1–13) were synthesized and characterized, Fourier transform infrared spectroscopy (FTIR), Liquid Chromatography-Mass Spectrometry (LC-MS), and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy.

Applications of Computerized Nuclear Magnetic Resonance and Infrared Spectroscopic Techniques to Rubber Analyses

1982 ◽  
Vol 55 (3) ◽  
pp. 913-930 ◽  
Author(s):  
Robert C. Hirst
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Small Computer ◽  
Spectroscopic Techniques ◽  
Special Effect ◽  
Ir Instrumentation ◽  
Nuclear Magnetic

Abstract Fourier transform spectroscopy is without doubt one of the most important developments in spectroscopy in the last few years. Although the basic principle had been known for many years, its applications in spectroscopy became practical only because of advances in small computer technology. In the case of nuclear magnetic resonance and infrared spectroscopy, the digital computer has had a special effect, in that it has caused, or at least made possible, the total redesign of NMR and IR instrumentation based on the Fourier transform (FT) concept. Because of its advantages over conventional methods, the FT method has caused great changes in NMR and IR spectroscopy, and FT instruments have made possible the solutions to many problems which previously were technically too difficult. NMR spectroscopy was reviewed in this Journal in 1976 and infrared spectroscopy was reviewed in 1972. Developments since those reviews will be emphasized here. In a short, selective review of this type, it is necessary to omit references to many excellent contributions in the literature. For very comprehensive listings of literature references, the reader may wish to consult the biennial reviews in “Analytical Chemistry” on NMR spectroscopy, infrared spectroscopy, rubber, analysis of high polymers, and coatings.

Steam explosion treatments of technical hydrolysis lignin

Holzforschung ◽  
2017 ◽  
Vol 71 (7-8) ◽  
pp. 571-574 ◽  
Author(s):  
Stepan Krutov ◽  
Elena Ipatova ◽  
Aleksander Vasilyev
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Solid State ◽  
Magnetic Resonance ◽  
Ftir Spectroscopy ◽  
Steam Explosion ◽  
Chemical Properties ◽  
Fourier Transform Infrared ◽  
Hydrolysis Lignin ◽  
And Chemical Properties

AbstractTechnical hydrolysis lignins, both freshly obtained and stored longterm under atmosphere conditions, were treated by steam explosion (SE, 235°C/3.2 MPa) for 1, 2, and 3 min. The SE treated lignins were characterized by means of solid-state13C nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy. It was found that SE leads to significant changes in morphological and chemical properties of lignin due to oxidation, condensation and hydrolytic destruction.

Sign in / Sign up

Export Citation Format

Share Document