Speciation and transformation of Co(II)/Ni(II)–citrate–imidazole ternary system – synthesis, spectroscopic and structural studies

A series of nickel(ii) complexes of 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tpt) have been prepared and identified using crystallographic techniques. Changes in the reaction conditions result in complexes with metal–triazine ligand ratios of 2 : 1, 1 : 1, and 1 : 2 being isolated. The results of the structural studies show that different stereoisomers can be formed, and the structures have been examined in order to identify the stabilizing features that might have led to these particular compounds being formed in preference to others in such labile systems. Numerous π–π stacking and hydrogen-bonding interactions can be found within the lattices of the structures, but these are notably absent in the structure of [Ni(tpt)2](ClO4)2 7, the complex isolated when perchlorate ions are added to solutions of all the other compounds.

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Structural studies of the phase separation in the UO2–PuO2–Pu2O3 ternary system

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2012.07.034 ◽

2013 ◽

Vol 432 (1-3) ◽

pp. 378-387 ◽

Cited By ~ 31

Author(s):

Thibaut Truphémus ◽

Renaud C. Belin ◽

Jean-Christophe Richaud ◽

Muriel Reynaud ◽

Marie-Annick Martinez ◽

...

Keyword(s):

Phase Separation ◽

Ternary System ◽

Structural Studies

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A new nitrogen rich open chain diazine ligand system: synthesis coordination chemistry and magneto-structural studies

Dalton Transactions ◽

10.1039/c7dt03845c ◽

2018 ◽

Vol 47 (8) ◽

pp. 2511-2521 ◽

Cited By ~ 4

Author(s):

Muhammad U. Anwar ◽

Ahmed Al-Harrasi ◽

Emma L. Gavey ◽

Melanie Pilkington ◽

Jeremy M. Rawson ◽

...

Keyword(s):

Coordination Chemistry ◽

Strong Preference ◽

Structural Studies ◽

Open Chain ◽

System Synthesis ◽

Ligand System ◽

Oxygen Donors

A new series of open chain diazine ligands that have a central bipyridne unit with two side-arms offering a range of ketone/alkoxide oxygen donors, diazine and pyridine terminal groups show a strong preference for binding three metals.

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Diastereomeric atropisomers of the tricyclo[9.3.1.03,8]pentadecane ring system. Synthesis and structural studies

Journal of the American Chemical Society ◽

10.1021/ja00276a041 ◽

1986 ◽

Vol 108 (16) ◽

pp. 4953-4956 ◽

Cited By ~ 34

Author(s):

K. J. Shea ◽

Jeffrey W. Gilman ◽

Curt D. Haffner ◽

T. Kirk. Dougherty

Keyword(s):

Ring System ◽

Structural Studies ◽

System Synthesis

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Influence of Zr/Sn ratio on the Transverse Piezoelectric Coefficient [Inline formula] in Lanthanum-Doped Lead Zirconate Titanate Stannate Thin Films

Integrated Ferroelectrics ◽

10.1080/10584587.2019.1668693 ◽

2019 ◽

Vol 201 (1) ◽

pp. 86-93

Author(s):

S. Laxmi Priya ◽

V. Kumar ◽

Isaku Kanno

Keyword(s):

Thin Films ◽

Phase Transition ◽

Ternary System ◽

Lead Zirconate Titanate ◽

Piezoelectric Coefficient ◽

Sol Gel ◽

Lead Zirconate ◽

Silicon Substrates ◽

Structural Studies ◽

Piezoelectric Characteristics

In this study, we report the effect of Zr/Sn ratio on the Antiferroelectric (AFE) → Ferroelectric (FE) phase transition and transverse piezoelectric characteristics on AFE thin films of compositions having the general formula Pb0.97La0.02(Zr1-x+ySnxTiy)O3, where y = 0.10 and 0.10 ≤ x ≤ 0.15 along the phase boundary in the ternary system Pb(Zr0.50Ti0.50)O3-Pb(Zr0.50Sn0.50)O3-PbZrO3. Thin films having a thickness of 2.0 µm were fabricated on platinised silicon substrates by sol–gel method. Data obtained from dielectric, ferroelectric and structural studies have been combined to explain the mechanism of AFE → FE switching.

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Ribosome Structural Organization

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100051670 ◽

1974 ◽

Vol 32 ◽

pp. 332-333

Author(s):

James A. Lake

Keyword(s):

Ribosomal Proteins ◽

Structural Organization ◽

Three Dimensional ◽

Small Subunit ◽

Structural Studies ◽

X Ray Diffraction ◽

Specific Antibodies ◽

X Ray ◽

E Coli ◽

Complete Sequences

The understanding of ribosome structure has advanced considerably in the last several years. Biochemists have characterized the constituent proteins and rRNA's of ribosomes. Complete sequences have been determined for some ribosomal proteins and specific antibodies have been prepared against all E. coli small subunit proteins. In addition, a number of naturally occuring systems of three dimensional ribosome crystals which are suitable for structural studies have been observed in eukaryotes. Although the crystals are, in general, too small for X-ray diffraction, their size is ideal for electron microscopy.

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Structural Studies on Mitotic Spindle Fibres

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100070345 ◽

1978 ◽

Vol 36 (3) ◽

pp. 615-626

Author(s):

J.R. Mcintosh

Keyword(s):

Chemical Composition ◽

Mitotic Spindle ◽

Structural Studies ◽

Mitotic Apparatus ◽

Chemical Studies ◽

Medical Interest ◽

Spindle Fibres

The mitotic apparatus is a structure of obvious biological and medical interest, but it has proved to be a difficult cellular machine to understand. The chemical composition of the spindle is only slightly elucidated, largely because of the difficulties in preparing useful isolates of the structure. Chemical studies of the mitotic spindle have been reviewed elsewhere (Mcintosh, 1977), and will not be discussed further here. One would think that structural studies on the mitotic apparatus (MA) in situ would be straightforward, but even with this approach there is some disagreement in the results obtained with various methods and by different investigators. In this paper I will review briefly the approaches which have been used in structural studies of the MA, pointing out the strengths and problems of each approach. I will summarize the principal findings of the different methods, and identify what seem to be fruitful avenues for further work.

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Image registration with a computer driven S.T.E.M.

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100107630 ◽

1978 ◽

Vol 36 (1) ◽

pp. 98-99

Author(s):

A.M.H. Schepman ◽

J.A.P. van der Voort ◽

J.E. Mellema

Keyword(s):

Spot Size ◽

Scanning Transmission Electron Microscope ◽

Small Computer ◽

Structural Studies ◽

Area Of Interest ◽

Transmission Electron ◽

Scanning Transmission ◽

Specimen Area ◽

On Line ◽

Minimum Distances

A Scanning Transmission Electron Microscope (STEM) was coupled to a small computer. The system (see Fig. 1) has been built using a Philips EM400, equipped with a scanning attachment and a DEC PDP11/34 computer with 34K memory. The gun (Fig. 2) consists of a continuously renewed tip of radius 0.2 to 0.4 μm of a tungsten wire heated just below its melting point by a focussed laser beam (1). On-line operation procedures were developped aiming at the reduction of the amount of radiation of the specimen area of interest, while selecting the various imaging parameters and upon registration of the information content. Whereas the theoretical limiting spot size is 0.75 nm (2), routine resolution checks showed minimum distances in the order 1.2 to 1.5 nm between corresponding intensity maxima in successive scans. This value is sufficient for structural studies of regular biological material to test the performance of STEM over high resolution CTEM.

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