scholarly journals Refined structure of c-phycocyanin from the cyanobacterium Synechococcus vulcanus at 1.6 Å: insights into the role of solvent molecules in thermal stability and co-factor structure

2002 ◽  
Vol 1556 (2-3) ◽  
pp. 168-174 ◽  
Author(s):  
Noam Adir ◽  
Radion Vainer ◽  
Natalia Lerner
Keyword(s):  
Thermal Stability ◽  
Factor Structure ◽  
Solvent Molecules ◽  
Role Of Solvent ◽  
Synechococcus Vulcanus

Lamotriginium crotonate and lamotriginium salicylate ethanol monosolvate: the role of solvent molecules in the packing organization

2017 ◽  
Vol 73 (7) ◽  
pp. 563-568
Author(s):  
Eleonora Freire ◽  
Gustavo A. Echeverría ◽  
Ricardo Baggio
Keyword(s):  
Crystal Structure ◽  
Building Blocks ◽  
Solvent Molecules ◽  
Role Of Solvent ◽  
The Way ◽  
Hydrogen Bonded

Two lamotriginium salts, namely lamotriginium crotonate [systematic name: 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazin-2-ium but-2-enoate, C9H8Cl2N5 +·C4H5O2 −, (III)] and lamotriginium salicylate [systematic name: 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazin-2-ium 2-hydroxybenzoate ethanol monosolvate, C9H8Cl2N5 +·C7H5O3 −·C2H5OH, (IV)] present extremely similar centrosymmetric hydrogen-bonded A...L...L...A packing building blocks (L is lamotriginium and A is the anion). The fact that salicylate salt (IV) is (ethanol) solvated, while crotonate salt (III) is not, has a profound effect on the way these elemental units aggregate to generate the final crystal structure. Possible reasons for this behaviour are analyzed and the hypothesis raised checked against similar structures in the literature.

Crystal structures of ecdysteroids: the role of solvent molecules in hydrogen bonding and isostructurality

2002 ◽  
Vol 58 (4) ◽  
pp. 710-720 ◽  
Author(s):  
László Fábián ◽  
Gyula Argay ◽  
Alajos Kálmán ◽  
Mária Báthori
Keyword(s):  
Cell Volume ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
Crystal Forms ◽  
Hydrogen Bond Networks ◽  
Solvent Molecules ◽  
Dihydroxy Derivative ◽  
Role Of Solvent

Three crystal forms of the steroid 20-hydroxyecdysone were identified by single-crystal X-ray diffraction analysis: a solvent-free modification, a methanol solvate hydrate and a trihydrate. The structure of a closely related steroid, polypodine B (the 5,20-dihydroxy derivative of ecdysone), was determined in its monohydrate form. Since the unit-cell volume of unsolvated 20-hydroxyecdysone was found to be considerably smaller than that of ecdysone [Huber & Hoppe (1965). Chem. Ber. 98, 2403–2424], a new structure determination of ecdysone was performed, which confirmed the unexpected difference between the unit-cell volumes. The crystals of ecdysone and 20-hydroxyecdysone are isostructural, while the mixed solvate of 20-hydroxyecdysone is homostructural with the hydrate of polypodine B. A detailed analysis of the hydrogen-bond networks in these closely related crystal pairs highlights their packing similarities, demonstrates the role of solvent molecules, and explains the unexpectedly small cell volume of 20-hydroxyecdysone.

scholarly journals The role of the substrate on the mechanical and thermal stability of Pd thin films during hydrogen (de)sorption

2021 ◽  
Vol 46 (5) ◽  
pp. 4137-4153
Author(s):  
Neha Verma ◽  
Rob Delhez ◽  
Niek M. van der Pers ◽  
Frans D. Tichelaar ◽  
Amarante J. Böttger
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Thermal Stability Of

Mossbauer Study of the Role of Aluminum and Chromium in Nitrogen Implanted Iron

1991 ◽  
Vol 235 ◽  
Author(s):  
M. Kopcewicz ◽  
J. Jagielski ◽  
A. Turos ◽  
D. L. Williamson
Keyword(s):  
Thermal Stability ◽  
Ion Implantation ◽  
Metallic Iron ◽  
Conversion Electron ◽  
Alloying Elements ◽  
Mössbauer Study ◽  
Conversion Electron Mössbauer Spectroscopy ◽  
Conversion Electron Mossbauer Spectroscopy ◽  
Thermal Stability Of

ABSTRACTThe role of alloying elements such as Cr and Al in the formation and stability of the nitride phases formed due to N ion implantation into metallic iron was studied by conversion electron Mössbauer spectroscopy (CEMS). The thermal stability of nitride phases upon 1 h annealing was greatly increased as a result of co-implanting either Cr or Al with N as compared to pure α-Fe implanted only with N.

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