Structural Analysis of a Potent Seed Germination Stimulant

2005 ◽  
Vol 58 (7) ◽  
pp. 505 ◽  
Author(s):  
Gavin R. Flematti ◽  
Emilio L. Ghisalberti ◽  
Kingsley W. Dixon ◽  
Robert D. Trengove ◽  
Brian W. Skelton ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Seed Germination ◽  
Single Crystal ◽  
X Ray ◽  
Germination Stimulant ◽  
Crystallographic Study

A single-crystal X-ray crystallographic study of a seed germination stimulant isolated from plant-derived smoke confirms it to be 3-methyl-2H-furo[2,3-c]pyran-2-one 1.

scholarly journals Phase transformations in cucurbituril host-guest complexes

2014 ◽  
Vol 70 (a1) ◽  
pp. C646-C646
Author(s):  
Oksana Danylyuk ◽  
Karolina Kedra-Krolik ◽  
Marta Worzakowska ◽  
Joanna Osypiuk-Tomasik ◽  
Vladimir Fedin
Keyword(s):  
Single Crystal ◽  
Crystal Lattice ◽  
Supramolecular Assembly ◽  
Water Molecules ◽  
Guest Molecules ◽  
X Ray ◽  
Host Guest Complex ◽  
Crystallographic Study ◽  
Partial Dehydration ◽  
Structure Changes

The retention of crystallinity upon desolvation of molecular crystals is not common, as the molecules are rigidly and densely packed in the crystals and the original framework usually collapses once solvent is removed from the structure. However, in rare cases the host framework remains substantially unaffected by solvent (guest) removal yielding structure with open channels or discrete lattice voids that can show permanent porosity. [1] Furthermore, sometimes happens, the desolvation process proceeds as single-crystal to single-crystal transformation resulting in distortion and sliding of the structure, changes in conformation, coordination modes and/or space group. Here we would like to present crystallographic study and thermal analysis on the dehydration process of the crystalline supramolecular complex between macrocyclic host cucurbit[6]uril and dopamine. In the solid state the 1:1 host-guest complex assembles into hexameric tubes with water-filled interior channels. Another set of water channels is created between three neighboring tubes in the crystal lattice. The crystals of such supramolecular assembly are not stable when out from mother solution and immediately start to loose water upon exposure to air. However, despite severe cracking the crystals dried in air maintained their integrity and still gave satisfactory diffraction pattern. The X-ray analysis showed significant decrease in the unit cell volume of the partially dehydrated crystals that corresponds to the liberation of some of the water molecules from the channels. Moreover, the reorganization of dopamine guest molecules has occurred in the crystal lattice as a response to the escape of water molecules from the structure. The partial dehydration and reorganization of the supramolecular framework proceeds via a single-crystal to single-crystal mechanism.

scholarly journals Single Crystal X-ray Structural Analysis and Electronic Theory of Sugar Molecules

2020 ◽  
Vol 835 ◽  
pp. 012023
Author(s):  
Norito Taniguchi ◽  
Tomohiko Ishii ◽  
Bui Quoc Huy ◽  
Genta Sakane
Keyword(s):  
Structural Analysis ◽  
Single Crystal ◽  
X Ray ◽  
Electronic Theory

scholarly journals Single-Crystal X-Ray Structural Analysis and Electronic Structures Calculation of Rare Sugar

2020 ◽  
Vol 835 ◽  
pp. 012015
Author(s):  
Bui Quoc Huy ◽  
Tomohiko Ishii ◽  
Norito Taniguchi ◽  
Natsumi Nagayama ◽  
Genta Sakane
Keyword(s):  
Structural Analysis ◽  
Single Crystal ◽  
Electronic Structures ◽  
Rare Sugar ◽  
X Ray

Triterpenoid Constituents in the Bark of Balanops australiana

2000 ◽  
Vol 53 (9) ◽  
pp. 809 ◽  
Author(s):  
William N. Setzer ◽  
Mary C. Setzer ◽  
R. Lynton Peppers ◽  
Michael B. McFerrin ◽  
Edward J. Meehan ◽  
...  
Keyword(s):  
Natural Products ◽  
Spectral Analysis ◽  
Structural Analysis ◽  
Single Crystal ◽  
Betulinic Acid ◽  
Bark Extract ◽  
X Ray

Two new triterpenoid natural products (friedelane-3,21α-diol and friedelane-3α,28,29-triol) have been isolated from the chloroform bark extract of Balanops australiana from Paluma, north Queensland, Australia. The known triterpenoids betulinic acid, friedelin, canophyllol, zeylanol and 21α-hydroxyfriedelan-3-one were also isolated. The structures of the compounds were elucidated on the basis of spectral analysis. A single-crystal X-ray structural analysis has been carried out on 21α-hydroxyfriedelan-3-one.

A Series of Enthalpy/Entropy-Driven Reversible Dissolution/Reorganization Equilibriums in the System of Cu(NO3)2–HL–GdX3–H2O (HL=5-methylpyrazine-2-carboxylic acid; X=Cl, Br, NO3, ClO4)

2014 ◽  
Vol 67 (11) ◽  
pp. 1679
Author(s):  
Sheng Zhang ◽  
Qi Yang ◽  
Xiangyu Liu ◽  
Gang Xie ◽  
Qing Wei ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Magnetic Property ◽  
Structural Analysis ◽  
Carboxylic Acid ◽  
Single Crystal ◽  
Coordination Polymers ◽  
X Ray Diffraction ◽  
X Ray ◽  
2D Network ◽  
Thermal Stability Of

Five coordination polymers, [Cu(L)2]n (1), {[Cu(L)(Cl)(H2O)]·H2O}2n (2), [KCu(L)(μ-Cl)2]n (3), [Cu(L)(Br)H2O]n (4), and {[Cu0.5(HL)(H2O)](NO3)·H2O}2n (5) (HL = 5-methylpyrazine-2-carboxylic acid) were obtained by reactions of a pyramidal CuII-containing ligand, {[Cu(L)2(H2O)]·3H2O}n (LCu), with Gd(ClO4)3·6H2O, GdCl3·6H2O, GdCl3·6H2O/KCl, GdBr3·6H2O, or Gd(NO3)3·6H2O in water. Structural analysis reveals that the structures of these compounds range from a 0D block to a 2D network with modification of the environment of the CuII ions compared with LCu. Interestingly, there occurred a series of reversible dissolution/reorganization equilibriums between the initial reactants and the final products 1–5, which were determined as enthalpy/entropy driven chemical equilibriums by single crystal X-ray diffraction and microcalorimetry. In addition, the thermal stability of 1–4 and the magnetic property of 2 are discussed.

scholarly journals 2P025 Preliminary neutron crystallographic study and X-ray structural analysis of mutant Transthyretin(The 48th Annual Meeting of the Biophysical Society of Japan)

2010 ◽  
Vol 50 (supplement2) ◽  
pp. S86
Author(s):  
Takeshi Yokoyama ◽  
Yuko Nabeshima ◽  
Takaaki Hosoya ◽  
Takashi Ohara ◽  
Kazuo Kurihara ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Annual Meeting ◽  
X Ray ◽  
Crystallographic Study ◽  
Biophysical Society

scholarly journals A C-shaped p-sulfonatocalix[4]arene-based supermolecule exhibiting mutual-inclusion and bilayer insertion of dipicolinate

CrystEngComm ◽  
2014 ◽  
Vol 16 (18) ◽  
pp. 3749-3757 ◽  
Author(s):  
Ahmad Husain ◽  
Clive L. Oliver
Keyword(s):  
Structural Analysis ◽  
Single Crystal ◽  
Thermal Methods ◽  
X Ray ◽  
Hot Stage Microscopy ◽  
Hirshfeld Analysis

A p-sulfonatocalix[4]arene-based, C-shaped supermolecule, [Ce3(PDA)4(C4AS)2·13H2O](NO3)·25H2O 1 was prepared and characterized by single crystal X-ray structural analysis, thermal methods (TG, DSC and hot-stage microscopy) and Hirshfeld analysis.

Structural analysis of and selective CO2 adsorption in mixed-ligand hydroxamate-based metal–organic frameworks

2020 ◽  
Vol 49 (29) ◽  
pp. 9948-9952 ◽  
Author(s):  
Koh Sugamata ◽  
Chikaze Takagi ◽  
Keiko Awano ◽  
Teruyuki Iihama ◽  
Mao Minoura
Keyword(s):  
Structural Analysis ◽  
Single Crystal ◽  
Co2 Adsorption ◽  
Isonicotinic Acid ◽  
Metal Organic Frameworks ◽  
Mixed Ligand ◽  
Gas Sorption ◽  
X Ray ◽  
X Ray Crystallography ◽  
Metal Organic

Two mixed-ligand metal–organic frameworks using benzene-1,4-dihydroxamic acid and isonicotinic acid were synthesized and fully characterized by single-crystal X-ray crystallography as well as N2, H2, and CO2 gas-sorption measurements.

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