A Family of Three-Dimensional Molecular Framework Materials Containing the Three-Connecting Ligands 2,4,6-Tris(n'-pyridyl)-1,3,5-triazine: 3-tpt and 4-tpt

2013 ◽  
Vol 66 (4) ◽  
pp. 452 ◽  
Author(s):  
Suzanne M. Neville ◽  
Gregory J. Halder ◽  
Keith S. Murray ◽  
Boujemaa Moubaraki ◽  
Cameron J. Kepert
Keyword(s):  
Magnetic Properties ◽  
Spin Crossover ◽  
Three Dimensional ◽  
High Dimensional ◽  
Magnetic Susceptibilities ◽  
Framework Materials ◽  
The One ◽  
3D Framework ◽  
Molecular Framework ◽  
3D Networks

Three-dimensional (3D) framework materials containing the ligands 2,4,6-tris(4′-pyridyl)-1,3,5-triazine (4-tpt) and 2,4,6-tris(3′-pyridyl)-1,3,5-triazine (3-tpt) have been prepared and their structure and magnetic properties investigated. The [MII(NCS)2(py)4] (MII = Fe, Co, py = 3-tpt, and 4-tpt) coordination environments in these materials have been targeted in an effort to prepare high-dimensional coordination polymers which contain spin crossover (SCO) centres. Using FeII, two isotopological cubic 3D materials [Fe(NCS)2(4-tpt)4/3]·n(BzOH,ac) (1a(Bz,ac)) and [Fe(NCS)2(3-tpt)4/3]·n(BzOH,ac) (1b(Bz,ac)) were formed. However, with CoII a different 3D framework topology results, [Co(NCS)2(3-tpt)4/3]·(BzOH,ac) (2(Bz,ac)). Further synthetic variation leads to the isostructural 3D materials trans-[MII(NCS)2(4-tpt)4/3]cis-[MII(NCS)2(4-tpt)2]·n(tce, EtOH) (Fe: 3a(Tce,Et) and Co: 3b(Tce,Et)) which form 3D networks outside Wellsian classification – and for which uniquely both two- and three-connecting modes of 4-tpt are present in the one complex. Despite having the metal coordination environments for which SCO has previously been observed, magnetic susceptibilities of this family of materials reveal a high spin nature.

A Three-Dimensional Metal-Organic Framework Displaying Guest-Dependent Spin-Crossover Behaviour

2018 ◽  
Vol 779 ◽  
pp. 110-114
Author(s):  
Feng Shao ◽  
Jia Jia Zhuang ◽  
Gang Luo ◽  
Ke Zhang ◽  
Chang Jiang Li ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Organic Complex ◽  
Single Crystal Diffraction ◽  
Guest Molecules ◽  
X Ray ◽  
Metal Organic Complex ◽  
Metal Organic ◽  
3D Framework

A new three-dimensional metal-organic complex, [{Fe (NCSe)2}3(TPB)4]x(guest), was prepared with the ligand of TPB (1,3,5-tris (4-pyridyl) benzene). The X-ray single crystal diffraction studied in 100 K and 173 K shown the change of bonds and angles of the framework. The guest exchange and magnetic properties indicated that the 3D framework can be responsible to the solvent guest molecules and shows guest-dependent spin-crossover behaviour.

scholarly journals DECONFINEMENT AND COLD ATOMS IN OPTICAL LATTICES

2006 ◽  
Vol 20 (30n31) ◽  
pp. 5169-5178
Author(s):  
M. A CAZALILLA ◽  
A. F. HO ◽  
T. GIAMARCHI
Keyword(s):  
Optical Lattices ◽  
Cold Atoms ◽  
Three Dimensional ◽  
Optical Traps ◽  
High Dimensional ◽  
Interacting Particles ◽  
Controllable System ◽  
One Dimensional ◽  
Physical Systems ◽  
The One

Despite the fact that by now one dimensional and three dimensional systems of interacting particles are reasonably well understood, very little is known on how to go from the one dimensional physics to the three dimensional one. This is in particular true in a quasi-one dimensional geometry where the hopping of particles between one dimensional chains or tubes can lead to a dimensional crossover between a Luttinger liquid and more conventional high dimensional states. Such a situation is relevant to many physical systems. Recently cold atoms in optical traps have provided a unique and controllable system in which to investigate this physics. We thus analyze a system made of coupled one dimensional tubes of interacting fermions. We explore the observable consequences, such as the phase diagram for isolated tubes, and the possibility to realize unusual superfluid phases in coupled tubes systems.

Magnetic Properties of the Random Mixture of Ising Spins

1974 ◽  
Vol 52 (2) ◽  
pp. 120-130 ◽  
Author(s):  
Shigetoshi Katsura ◽  
Fumitaka Matsubara
Keyword(s):  
Magnetic Properties ◽  
Binary Mixture ◽  
Three Dimensional ◽  
Bethe Lattice ◽  
Experimental Result ◽  
Specific Heats ◽  
Random Mixture ◽  
The One ◽  
Critical Lines ◽  
Ising Spins

A method of obtaining the magnetic properties of the random mixture of plural kinds of magnetic atoms (including nonmagnetic atoms) in both the site and the bond problems is presented. The specific heats and the susceptibilities of the one-dimensional binary mixture and the binary Bethe lattice are exactly given. The phase transitions of both the Bethe lattice and the ordinary two- and three-dimensional lattices are also discussed. It is shown that the phase boundary of an ordinary binary mixture in the site problem is rather similar to that in the bond problem when JAAJBB > 0 and JαJβ > 0, while they are quite different when JAAJBB < 0 and JαJβ < 0. In the latter case, the two critical lines of ordinary lattice, on which the uniform or the staggered susceptibility diverges, cross at some value of concentration of magnetic atoms, while they are separated by the paramagnetic phase in the bond problem. The experimental result for (MnxCr1−x)Sb is similar to the former and that for Co(SxSe1−x)2 is similar to the latter.

Highest Connectivity in a Purely Inorganic 3D Compound Based on Paradodecatungstate-B Clusters: Synthesis and Magnetic Properties

2009 ◽  
Vol 64 (7) ◽  
pp. 809-814 ◽  
Author(s):  
Chun-Jing Zhang ◽  
Hai-Jun Pang ◽  
Ya-Guang Chen
Keyword(s):  
Magnetic Properties ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Uv Spectroscopy ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Simulation Procedure ◽  
3D Framework ◽  
Ir And Uv Spectroscopy

A new paradodecatungstate-B compound, [{Co(H2O)4}4(H4W12O42)]·10H2O (1) of the polyoxometalate series has been synthesized and characterized by elemental analysis, IR and UV spectroscopy, TG analysis, and single-crystal X-ray diffraction. Compound 1 exhibits a unique 8- connected three-dimensional (3D) framework with a (42 · 820 · 126) topology. Moreover, 1 displays antiferromagnetic interactions in the 2 - 300 K temperature range, well reproduced by a simulation procedure.

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.

The Magnetic Properties of Mixed Ferrimagnetic Spin System

2010 ◽  
Vol 148-149 ◽  
pp. 1036-1041
Author(s):  
Shuang Juan Shen ◽  
Li Qin Jiang ◽  
Ke Hua Zhong ◽  
Zhi Gao Chen ◽  
Zhi Gao Huang
Keyword(s):  
Magnetic Properties ◽  
Spin System ◽  
Three Dimensional ◽  
Simple Calculation ◽  
Anisotropy Constant ◽  
Mixed System ◽  
One Dimensional ◽  
Mc Simulation ◽  
The One ◽  
Magnetization Behavior

Based on Monte Carlo (MC) simulation, the magnetization behavior of mixed ferrimagnetic spin system with single-ion anisotropy under external field is investigated. It is assumed that the element of the mixed system is composed of spin-1 and spin-3/2 by turns. The simulated results indicate that there exist the magnetization curves at the ground state on the one-dimensional spin chain, two-dimensional spin system as well as three-dimensional spin system. It found that the size, anisotropy constant and spin configurations influence evidently the magnetic properties of the mixed system. Moreover, the magnetic plateaus and the phase diagrams of the systems can be well interpreted in terms of the simple calculation of energy.

Diffraction contrast of dislocations in icosahedral quasicrystals

1990 ◽  
Vol 48 (4) ◽  
pp. 454-455
Author(s):  
K. Urban ◽  
Z. Zhang ◽  
M. Wollgarten ◽  
D. Gratias
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Complete Characterization ◽  
Extinction Condition ◽  
Burgers Vector ◽  
Diffraction Contrast ◽  
Lattice Geometry ◽  
Reference Space ◽  
Icosahedral Quasicrystals ◽  
The One

Recently dislocations have been observed by electron microscopy in the icosahedral quasicrystalline (IQ) phase of Al65Cu20Fe15. These dislocations exhibit diffraction contrast similar to that known for dislocations in conventional crystals. The contrast becomes extinct for certain diffraction vectors g. In the following the basis of electron diffraction contrast of dislocations in the IQ phase is described. Taking account of the six-dimensional nature of the Burgers vector a “strong” and a “weak” extinction condition are found.Dislocations in quasicrystals canot be described on the basis of simple shear or insertion of a lattice plane only. In order to achieve a complete characterization of these dislocations it is advantageous to make use of the one to one correspondence of the lattice geometry in our three-dimensional space (R3) and that in the six-dimensional reference space (R6) where full periodicity is recovered . Therefore the contrast extinction condition has to be written as gpbp + gobo = 0 (1). The diffraction vector g and the Burgers vector b decompose into two vectors gp, bp and go, bo in, respectively, the physical and the orthogonal three-dimensional sub-spaces of R6.

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.

Sea Urchins and Circuses: The Modernist Natural Histories of Jean Painlevé and Alexander Calder

2018 ◽  
Vol 13 (2) ◽  
pp. 187-211
Author(s):  
Patricia E. Chu
Keyword(s):  
New Media ◽  
Sea Urchins ◽  
Life Sciences ◽  
Three Dimensional ◽  
Machine Age ◽  
Avant Garde ◽  
History Of ◽  
And Performance ◽  
The One ◽  
Natural Historian

The Paris avant-garde milieu from which both Cirque Calder/Calder's Circus and Painlevé’s early films emerged was a cultural intersection of art and the twentieth-century life sciences. In turning to the style of current scientific journals, the Paris surrealists can be understood as engaging the (life) sciences not simply as a provider of normative categories of materiality to be dismissed, but as a companion in apprehending the “reality” of a world beneath the surface just as real as the one visible to the naked eye. I will focus in this essay on two modernist practices in new media in the context of the history of the life sciences: Jean Painlevé’s (1902–1989) science films and Alexander Calder's (1898–1976) work in three-dimensional moving art and performance—the Circus. In analyzing Painlevé’s work, I discuss it as exemplary of a moment when life sciences and avant-garde technical methods and philosophies created each other rather than being classified as separate categories of epistemological work. In moving from Painlevé’s films to Alexander Calder's Circus, Painlevé’s cinematography remains at the forefront; I use his film of one of Calder's performances of the Circus, a collaboration the men had taken two decades to complete. Painlevé’s depiction allows us to see the elements of Calder's work that mark it as akin to Painlevé’s own interest in a modern experimental organicism as central to the so-called machine-age. Calder's work can be understood as similarly developing an avant-garde practice along the line between the bestiary of the natural historian and the bestiary of the modern life scientist.

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