Synthesis, crystal structures and luminescence properties of lanthanide oxalatophosphonates with a three-dimensional framework structure

2009 ◽  
Vol 33 (1) ◽  
pp. 119-124 ◽  
Author(s):  
Yanyu Zhu ◽  
Zhengang Sun ◽  
Yan Zhao ◽  
Jing Zhang ◽  
Xin Lu ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Three Dimensional ◽  
Luminescence Properties ◽  
Framework Structure

Crystal chemistry of zirconosilicates and their analogs: topological classification of MT frameworks and suprapolyhedral invariants

2002 ◽  
Vol 58 (2) ◽  
pp. 198-218 ◽  
Author(s):  
G. D. Ilyushin ◽  
V. A. Blatov
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Crystal Chemistry ◽  
Three Dimensional ◽  
Geometrical Interpretation ◽  
Topological Classification ◽  
Hierarchical Analysis ◽  
Framework Structure ◽  
Coordination Spheres

The first attempt is undertaken to consider systematically topological structures of zirconosilicates and their analogs (60 minerals and 34 synthetic phases), where the simplest structure units are MO6 octahedra and TO4 tetrahedra united by vertices ([TO4]:[MO6] = 1:1–6:1). A method of analysis and classification of mixed three-dimensional MT frameworks by topological types with coordination sequences {N k } is developed, which is based on the representation of crystal structure as a finite `reduced' graph. The method is optimized for the frameworks of any composition and complexity and implemented within the TOPOS3.2 program package. A procedure of hierarchical analysis of MT-framework structure organization is proposed, which is based on the concept of polyhedral microensemble (PME) being a geometrical interpretation of coordination sequences of M and T nodes. All 12 theoretically possible PMEs of MT 6 polyhedral composition are considered where T is a separate and/or connected tetrahedron. Using this methodology the MT frameworks in crystal structures of zirconosilicates and their analogs were analyzed within the first 12 coordination spheres of M and T nodes and related to 41 topological types. The structural correlations were revealed between rosenbuschite, lavenite, hiortdahlite, woehlerite, siedozerite and the minerals of the eudialyte family.

scholarly journals Complex cobalt silicates and germanates crystallizing in a porous three-dimensional framework structure

CrystEngComm ◽  
2020 ◽  
Vol 22 (6) ◽  
pp. 1112-1119 ◽  
Author(s):  
Mohammad Usman ◽  
Mark D. Smith ◽  
Vancho Kocevski ◽  
Theodore Besmann ◽  
Hans-Conrad zur Loye
Keyword(s):  
Magnetic Properties ◽  
Dft Calculations ◽  
Single Crystals ◽  
Crystal Structures ◽  
Three Dimensional ◽  
Framework Structure ◽  
Electronic And Magnetic Properties

Single crystals of new cesium cobalt silicates and germanates exhibiting three-dimensional, ion-exchangeable crystal structures were grown from a mixed CsCl–CsF flux, and their electronic and magnetic properties were studied using DFT calculations.

scholarly journals Crystal structures of the recreational drug N-(4-methoxyphenyl)piperazine (MeOPP) and three of its salts

2020 ◽  
Vol 76 (4) ◽  
pp. 488-495 ◽  
Author(s):  
Haruvegowda Kiran Kumar ◽  
Hemmige S. Yathirajan ◽  
Chayanna Harish Chinthal ◽  
Sabine Foro ◽  
Christopher Glidewell
Keyword(s):  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Negative Charge ◽  
Three Dimensional ◽  
Recreational Drug ◽  
Framework Structure ◽  
Piperazine Ring ◽  
Related Compounds

Crystal structures are reported for N-(4-methoxyphenyl)piperazine (MeOPP), (I), and for its 3,5-dinitrobenzoate, 2,4,6-trinitrophenolate (picrate) and 4-aminobenzoate salts, (II)–(IV), the last of which crystallizes as a monohydrate. In MeOPP, C11H16N2O, (I), the 4-methoxyphenyl group is nearly planar and it occupies an equatorial site on the piperazine ring: the molecules are linked into simple C(10) chains by N—H...O hydrogen bonds. In each of the salts, i.e., C11H17N2O+·C7H3N2O6 −, (II), C11H17N2O+·C6H2N3O7 −, (III), and C11H17N2O+·C7H6NO2 −·H2O, (IV), the effectively planar 4-methoxyphenyl substituent again occupies an equatorial site on the piperazine ring. In (II), two of the nitro groups are disordered over two sets of atomic sites and the bond distances in the anion indicate considerable delocalization of the negative charge over the C atoms of the ring. The ions in (II) are linked by two N—H...O hydrogen bonds to form a cyclic, centrosymmetric four-ion aggregate; those in (III) are linked by a combination of N—H...O and C—H...π(arene) hydrogen bonds to form sheets; and the components of (IV) are linked by N—H...O, O—H...O and C—H...π(arene) hydrogen bonds to form a three-dimensional framework structure. Comparisons are made with the structures of some related compounds.

scholarly journals Crystal structures of Na2SeO4·1.5H2O and Na2SeO4·10H2O

2014 ◽  
Vol 70 (8) ◽  
pp. 54-57 ◽  
Author(s):  
Matthias Weil ◽  
Barbara Bonneau
Keyword(s):  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Three Dimensional ◽  
Sodium Selenate ◽  
Water Molecules ◽  
Asymmetric Unit ◽  
Framework Structure ◽  
Rotation Symmetry ◽  
Coordination Polyhedra ◽  
Medium Strength

The crystal structures of Na2SeO4·1.5H2O (sodium selenate sesquihydrate) and Na2SeO4·10H2O (sodium selenate decahydrate) are isotypic with those of Na2CrO4·1.5H2O and Na2XSeO4·10H2O (X= S, Cr), respectively. The asymmetric unit of the sesquihydrate contains two Na+cations, one SeO4tetrahedron and one and a half water molecules, the other half being generated by twofold rotation symmetry. The coordination polyhedra of the cations are a distorted monocapped octahedron and a square pyramid; these [NaOx] polyhedra are linked through common edges and corners into a three-dimensional framework structure, the voids of which are filled with the Se atoms of the SeO4tetrahedra. The structure is consolidated by O—H...O hydrogen bonds between coordinating water molecules and framework O atoms. The asymmetric unit of the decahydrate consists of two Na+cations, one SeO4tetrahedron and ten water molecules. Both Na+cations are octahedrally surrounded by water molecules and by edge-sharing condensed into zigzag chains extending parallel to [001]. The SeO4tetrahedra and two uncoordinating water molecules are situated between the chains and are connected to the chains through an intricate network of medium-strength O—H...O hydrogen bonds.

Two novel cadmium(ii) carboxyphosphonates with 3D framework structure: synthesis, crystal structures, luminescence and molecular recognition properties

RSC Advances ◽  
2015 ◽  
Vol 5 (96) ◽  
pp. 79041-79049 ◽  
Author(s):  
Chao Ma ◽  
Cheng-Qi Jiao ◽  
Zhen-Gang Sun ◽  
Yan-Yu Zhu ◽  
Xiao-Wen Zhang ◽  
...  
Keyword(s):  
Molecular Recognition ◽  
Crystal Structures ◽  
Luminescence Properties ◽  
Framework Structure ◽  
Hydrothermal Conditions ◽  
Structure Synthesis ◽  
3D Framework

Two novel cadmium(ii) carboxyphosphonates with 3D framework structure have been synthesized under hydrothermal conditions. The luminescence properties and molecular recognition properties of the compounds have been investigated.

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