Linear-chain ferromagnetism in the one-dimensional compounds CoCl2(pyrazole)2 and CoCl2(indazole)2

1979 ◽  
Vol 12 (1) ◽  
pp. 4-10 ◽  
Author(s):  
J.A.C. Van Ooijen ◽  
J. Reedijk
Keyword(s):  
Linear Chain ◽  
One Dimensional ◽  
The One

Electronic and Resonance Raman Spectra of Some New Mixed-Valence Compounds of Pt and Pd with a Metal-Halide Chain

1980 ◽  
Vol 35 (6) ◽  
pp. 676-679 ◽  
Author(s):  
G. C. Papavassiliou ◽  
D. Layek
Keyword(s):  
Raman Spectra ◽  
Linear Chain ◽  
Mixed Valence ◽  
Resonance Raman ◽  
Chain Structure ◽  
One Dimensional ◽  
Resonance Raman Spectra ◽  
The One ◽  
Mixed Valence Compounds ◽  
Linear Chain Structure

Abstract The electronic and resonance Raman spectra of new mixed-valence compounds of the type M2ʹ[M(L)X3][M(L)X5], where Mʹ = K, NH4, M = Pt or Pd, L = NH3 or pyridine, and X = Cl, Br or I, have been studied. The single-crystal polarized reflectance spectra indicate the one-dimensional semiconductor behaviour. The polarized resonance Raman spectra confirm the --M(II)--X-M(IV)-X linear chain structure, which is in accordance with the X-ray results. The polarization of M-N bands can be explained by the Snyder's theory (1971).

scholarly journals Renormalization Group Approach to a One-Dimensional Cooperative T–e Jahn-Teller System

1977 ◽  
Vol 32 (1) ◽  
pp. 111-112
Author(s):  
S. Brühl ◽  
E. Sigmund
Keyword(s):  
Free Energy ◽  
Renormalization Group ◽  
Ising Model ◽  
Linear Chain ◽  
Group Approach ◽  
One Dimensional ◽  
Renormalization Group Approach ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
The One

Abstract A linear chain of T-e molecules exhibiting the cooperative Jahn-Teller effect is considered. Following Nauenberg's1 treatment of the one-dimensional Ising model a renormalization group approach is used. The series-expansion of the free energy is put into a closed form.

Vibrational studies of, and model for, halogen-bridged linear-chain mixed-valence complexes

1985 ◽  
Vol 314 (1528) ◽  
pp. 131-144 ◽  
Keyword(s):  
Resonance Raman Spectroscopy ◽  
Linear Chain ◽  
Mixed Valence ◽  
Force Constants ◽  
One Dimensional ◽  
Moderate Resolution ◽  
Vibrational Studies ◽  
The One ◽  
Expected Increase ◽  
Chain Interaction

A number of complexes of the type [M II (LL) 2 ] [Pt IV (LL) 2 Cl 2 ] [ClO 4 ] 4 , where M = Ni, Pd or Pt and LL = 1,2-diaminoethane (en) or 1,2-diaminopropane (pn), as well as the monomers [Pt IV (LL) 2 Cl 2 ] Cl 2 and [M II (LL) 2 ] Cl 2 have been studied using Fourier transform infrared (f.t.i.r.) and resonance Raman spectroscopy. Under conditions of low tem perature and moderate resolution ( ca . 0.5 cm -1 ) it has proved possible to observe chlorine isotopic splitting in bands due to both the symmetric and the antisymmetric stretching modes of the linear Pt IV Cl 2 units in the chains. On the basis that the one-dimensional electronic properties of these chains are likely to be related to the in-chain Pt IV -Cl stretching force constants, a simple vibrational model is presented, which is able to reproduce the observed splitting patterns to well within experimental error. A comparative study of the Pt IV -Cl stretching force constants for the series of en complexes shows the trend: trans -[Pt IV (en) 2 Cl 2 ] Cl 2 (monomer) > Pd II - Pt IV > Ni II - Pt IV > Pt II −Pt lV . This trend is in line with that of the M II …Pt IV intervalence band maxima, namely Pd II - Pt IV (25000 cm -1 ) > Ni II - Pt IV (22200 cm -1 ) > Pt II - Pt IV (20800 cm -1 ), indicating an increase in M II … Cl chain interaction (and an expected increase in conductance) along the series.

scholarly journals Structure, phase transition and properties of the one-dimensional antiferromagnet Cu(2,6-dimethylpyrazine)Br2

RSC Advances ◽  
2021 ◽  
Vol 11 (37) ◽  
pp. 22565-22570
Author(s):  
Fei Ding ◽  
Chuanlu Yang ◽  
Xiangnan Gong ◽  
Hui Zheng ◽  
Xiaoyu Zhou ◽  
...  
Keyword(s):  
Phase Transition ◽  
Linear Chain ◽  
Chain Structure ◽  
One Dimensional ◽  
Structure Phase ◽  
Non Linear ◽  
Structure Phase Transition ◽  
The One ◽  
Linear Chain Structure

Novel transition from linear to non-linear chain structure was discovered in a one-dimensional magnet Cu(2,6-dimethylpyrazine)Br2.

Synthons and design in metal phosphates and oxalates with open architectures

2001 ◽  
Vol 57 (1) ◽  
pp. 1-12 ◽  
Author(s):  
C. N. R. Rao ◽  
Srinivasan Natarajan ◽  
Amitava Choudhury ◽  
S. Neeraj ◽  
R. Vaidhyanathan
Keyword(s):  
Linear Chain ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Ladder Structure ◽  
One Dimensional ◽  
Metal Phosphates ◽  
Open Framework ◽  
Framework Materials ◽  
Layer Structures ◽  
The One

We briefly describe the structures of open-framework metal phosphates with different dimensionalities, such as the one-dimensional linear-chain and ladder structures, two-dimensional layer structures and three-dimensional structures with channels. We demonstrate the role of the zero-dimensional four-membered ring monomer and of the one-dimensional ladder structure as the starting building units or synthons involved in the formation of the complex architectures. Thus, we show how the one-dimensional ladder structure transforms to two- and three-dimensional structures under mild conditions. The two-dimensional layer structures also transform to three-dimensional structures, while the zero-dimensional monomer transforms to layered and three-dimensional structures under ordinary reaction conditions. These transformations provide an insight into the possible pathways involved in the building up of the complex structures of metal phosphates. The isolation of amine phosphates during the hydrothermal synthesis of metal phosphates and also the facile reactions between amine phosphates and metal ions to yield a variety of open-framework materials have thrown light on the mechanism of formation and design of these structures. The existence of a hierarchy of open-framework metal oxalates and their ready formation by employing amine oxalates as intermediates provides additional support to the observations made earlier with regard to the phosphates.

Antiferromagnetism

1955 ◽  
Vol 232 (1188) ◽  
pp. 48-68 ◽  
Keyword(s):  
Variational Method ◽  
Ground State ◽  
Linear Chain ◽  
Ground States ◽  
Variational Calculation ◽  
Statistical Problem ◽  
One Dimensional ◽  
Nearest Neighbours ◽  
The One ◽  
Chain Problem

The ground state of a lattice with one electron per atom and antiferromagnetic interactions between nearest neighbours only is examined by a variational method similar in principle to the treatments by Hulthén (1938) and Kasteleijn (1952) of the linear-chain problem. The calculation involves a statistical problem which is shown to be exactly equivalent to the Ising ferromagnetic problem. This cannot be solved exactly, except in the one-dimensional case, and so the Bethe–Peierls method is used to solve it approximately. In complete contradiction to the Kubo (1953) variational calculation it is concluded that all lattices have disordered ground states. The energy differences between ordered and disordered states are small and so the nature of the ground state is likely to be sensitive to small additional ordering forces.

Exploring the Multidimensional Facets of Authoritarianism: Authoritarian Aggression and Social Dominance Orientation

2008 ◽  
Vol 67 (1) ◽  
pp. 51-60 ◽  
Author(s):  
Stefano Passini
Keyword(s):  
Social Dominance ◽  
Factor Model ◽  
Three Dimensional ◽  
Social Dominance Orientation ◽  
Model Fit ◽  
Regression Analyses ◽  
One Dimensional ◽  
Confirmatory Factor ◽  
The One ◽  
Better Than

The relation between authoritarianism and social dominance orientation was analyzed, with authoritarianism measured using a three-dimensional scale. The implicit multidimensional structure (authoritarian submission, conventionalism, authoritarian aggression) of Altemeyer’s (1981, 1988) conceptualization of authoritarianism is inconsistent with its one-dimensional methodological operationalization. The dimensionality of authoritarianism was investigated using confirmatory factor analysis in a sample of 713 university students. As hypothesized, the three-factor model fit the data significantly better than the one-factor model. Regression analyses revealed that only authoritarian aggression was related to social dominance orientation. That is, only intolerance of deviance was related to high social dominance, whereas submissiveness was not.

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