Building 3D materials from adjustable 2D-units; towards the Design of new Bi-based compounds

2011 ◽  
Vol 1309 ◽  
Author(s):  
M. Colmont ◽  
D. Endara ◽  
M. Huvé ◽  
S.V. Krivovichev ◽  
O. Mentré
Keyword(s):  
Crystal Structure ◽  
Continuous Series ◽  
Infinite Plane ◽  
Single Chain ◽  
Crystallographic Form ◽  
Zinc Compounds

ABSTRACTIn the Bi2O3-MO-P2O5 diagram, on the basis of previous compounds based on 2D-ribbon like units, we have predicted and prepared the infinite term. It contains [Bi2O2]2+ planes arranged within a never-observed crystallographic form. In this series, the ribbons-like units are polycations built on the linkage of n O(Bi,M)4 tetrahedra along their width and infinite in a perpendicular dimension. Hence, this novel form completes the continuous series of analogue compounds, whose building units now extend from the single chain to the infinite plane, via a number of discrete n values (2,3,4,5,6,7,8,9,10,11). The presented materials of formulae Bi4MP2O12 (M= Zn and Mg) roughly show the same crystal structure. However different arrangements of the groups located between the [Bi2O2]2+ planes are at the origin of a complex superstructure in the case of the zinc compounds.

scholarly journals Crystal structure of chain silicate Cs3LuSi3O9

2021 ◽  
Vol 77 (12) ◽  
Author(s):  
Hiromitsu Kimura ◽  
Hisanori Yamane
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Title Compound ◽  
Three Dimensional ◽  
Unit Cell ◽  
Single Chain ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Chain Silicate ◽  
A Chain

A caesium lutetium(III) silicate, Cs3LuSi3O9, was synthesized by heating a pelletized mixture of Cs2CO3, Lu2O3 and SiO2 at 1273 K. Single crystals of the title compound were grown in a melted area of the pellet. Cs3LuSi3O9 is a single-chain silicate (orthorhombic space group Pna21) with a chain periodicity of six and is isostructural with Cs3 RE IIIGe3O9 (RE = Pr, Nd and Sm–Yb). The two symmetry-dependent [Si6O18]12− chains in the unit cell lie parallel to the [011] direction. The Lu3+ ions are octahedrally coordinated by O atoms of the silicate chains, generating a three-dimensional framework. Cs+ ions are located in the voids in the framework.

Pb-bearing hollandite-type titanates: A first natural occurrence and reconnaissance synthesis study

2003 ◽  
Vol 67 (5) ◽  
pp. 957-965 ◽  
Author(s):  
E. P. Reguir ◽  
A. R. Chakhmouradian ◽  
R. H. Mitchell
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Electron Microprobe ◽  
Rietveld Method ◽  
Continuous Series ◽  
Natural Occurrence ◽  
Alkaline Complex ◽  
Maximum Proportion ◽  
End Members ◽  
Intermediate Member

AbstractSome samples of hollandite-type titanates from the Murun alkaline complex (Yakutia, Russia) contain appreciable amounts of Pb (up to 12.5 wt.% PbO). These titanates occur in a pegmatitic K-feldsparaegirine rock containing subordinate K-rich batisite, titanite, wadeite and other minerals. The Pb-bearing crystals coexist with hollandite-type phases devoid of detectable Pb and zoned from a Kdominant (priderite) core to a Ba-dominant (henrymeyerite) rim. Recalculation of the microprobe analyses on the stoichiometric basis indicates that most of the Fe occurs in this mineral in trivalent form, suggesting the existence of a solid solution between the Ba(Ti6Fe)O16, K2(Ti6Fe)O16 and Pb(Ti6Fe)O16 end-members. The maximum proportion of the latter end-member in the Murun titanates is ∽45 mol.%. The Ba-free compositions [Pb1.0–1.3(Ti,Fe)8O16] and intermediate members of the (Ba1–xPbx)(Ti6Fe)O16 series were synthesized at 1050 –1100ºC. The synthesis products comprise tetragonal hollandites of various stoichiometry intermixed with rutile, a pseudobrookite-type phase and (for the Ba-free compositions) minor macedonite. Electron microprobe analyses of the hollandites indicate that there is a continuous series of compositions between the two hexatitanate end-members, Ba(Ti6Fe)O16 and Pb(Ti6Fe)O16. The crystal structure of one intermediate member was refined by the Rietveld method in space group I4/m, and found to differ from the hollandite archetype (i.e. Pb-bearing Ba manganate) in that Pb is preferentially partitioned into the 2b tunnel site at (0,0,½), whereas Ba is partitioned into the larger 4e site at (0,0,∽0.8).

Oxazoline chemistry — Part IV: Synthesis and characterization of oxazoline complexes of the zinc halides

2003 ◽  
Vol 81 (12) ◽  
pp. 1482-1491 ◽  
Author(s):  
Tosha M Barclay ◽  
Ignacio del Río ◽  
Robert A Gossage ◽  
Sarah M Jackson
Keyword(s):  
Crystal Structure ◽  
Structural Diversity ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Metal Centre ◽  
Zinc Compounds ◽  
X Ray ◽  
H Nmr ◽  
Oxazoline Ligands

The synthesis and characterization of 11 zinc halide derivatives that contain monodentate oxazoline ligands is described. The treatment of ether solutions of [ZnX2] (X = Cl, Br, I) with 2-aryl- or 2-methyl-2-oxazolines results in the formation of mildly hygroscopic complexes of the general formulae [ZnX2(ox)2] (ox = 2-methyl-2-oxazoline (1), 2,4,4-trimethyl-2-oxazoline (2), 2-phenyl-2-oxazoline (3), or 4,4-dimethyl-2-phenyl-2-oxazoline (4)), except in the case of ZnI2, which does not form an isolable complex — likely for steric reasons — with oxazoline 4. Treatment of [ZnBr2(4)2] with 1 reveals (1H NMR) that 1 only sluggishly displaces coordinated 4 at temperatures below 50 °C. The structural characterization, via single crystal X-ray diffraction, of six of the complexes, viz. [ZnI2(1)2], [ZnI2(2)2], [ZnX2(3)2] (X = Cl, Br, or I), and [ZnBr2(4)2], is also reported. All of these structurally characterized complexes are mononuclear zinc compounds with an overall distorted tetrahedral arrangement of the two halide and two oxazoline ligands around the zinc metal centre. The oxazoline series of complexes reported herein show little structural diversity, a facet which is in contrast to their substituted pyridine analogues.Key words: oxazoline, zinc, X-ray crystal structure, coordination complex, NMR spectroscopy, Zn(II).

scholarly journals Crystal structure of the complex between a single chain antibody and neuraminidase: a basis for rational protein engineering

1993 ◽  
Vol 49 (s1) ◽  
pp. c110-c110
Author(s):  
R. L. Malby ◽  
M. C. Lawrence ◽  
W. R. Tulip ◽  
V. R. Harley ◽  
R. G. Webster ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Protein Engineering ◽  
Single Chain ◽  
Single Chain Antibody
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