scholarly journals Pressure-induced phase transitions in organic molecular crystals: a combination of x-ray single-crystal and powder diffraction, raman and IR-spectroscopy

2008 ◽  
Vol 121 (2) ◽  
pp. 022023 ◽  
Author(s):  
E V Boldyreva ◽  
H Sowa ◽  
H Ahsbahs ◽  
S V Goryainov ◽  
V V Chernyshev ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Ir Spectroscopy ◽  
Single Crystal ◽  
Powder Diffraction ◽  
Molecular Crystals ◽  
X Ray ◽  
Organic Molecular Crystals ◽  
Raman And Ir Spectroscopy

Phase Diagram Studies on Neopentylglycol and Pentaerythritol-Thermal Energy Storage Materials

1989 ◽  
Vol 33 ◽  
pp. 445-452 ◽  
Author(s):  
Dhanesh Chandra ◽  
Renee A. Lynch ◽  
Wei Ding ◽  
John J. Tomlinson
Keyword(s):  
Phase Diagram ◽  
Phase Transitions ◽  
Molecular Crystals ◽  
Energy Storage Materials ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Two Phase ◽  
X Ray ◽  
Organic Molecular Crystals ◽  
Chain Type

AbstractPentaerythritol (PE) and neopentylglycol (NPG) are organic molecular crystals which have hydrogen-bonded lattices with layered- and chain-type structures, respectively. The PE undergoes solid-state phase transitions at 416K, from tetragonal to a cubic (γ’) structure and NPG also undergoes this transition at 317K from a monoclinic to a cubic (γ) structure. The phase transitions in binary PE-NPG solid solutions show more than one solid-solid transition in which the NPG-rich β transforms to γ at a constant temperature but the transition of the PE-rich a phase to γ’ passes through a two-phase field at a temperature that varies as a function of composition. Structural analyses by high-temperature x-ray diffractometry have revealed some new, interesting transitions. A phase diagram has been constructed for 0-30 mol% NPG in the PE-NPG system, using x-ray diffraction and differential scanning calorimetry results, and work is in progress to complete this diagram. The variation of lattice parameters as a function of temperature in the α, γ and γ’ phases for PE+20 mol% NPG are presented here, together with a discussion of phase transitions for certain compositions.

scholarly journals Pentanuclear Hetero-bimetallic 3d-4f Complexes of the Ln2Ni3 type: Pr2Ni3 and Gd2Ni3

2018 ◽  
Author(s):  
Jana König ◽  
Alexandra Kelling ◽  
Uwe Schilde ◽  
Peter Strauch ◽  
Andreas Taubert
Keyword(s):  
Aqueous Solution ◽  
Ir Spectroscopy ◽  
Single Crystal ◽  
Structure Analysis ◽  
Powder Diffraction ◽  
Lanthanide Ions ◽  
Bimetallic Complexes ◽  
Space Group ◽  
X Ray

In aqueous solution planar bis(1,2-dithiooxalato)nickelates(II), [Ni(dto)2]2- react with lanthanide ions (Ln3+) to form pentanuclear, hetero-bimetallic complexes of the general composition [{Ln(H2O)n}2{Ni(dto)2}3] · x H2O (n = 4 or 5; x = 9 - 12). Two complexes of this series, [{Pr(H2O)5}2{Ni(dto)2}3] · 11 H2O, Pr2Ni3 1 and [{Gd(H2O)5}2{Ni(dto)2}3] · 11 H2O, Gd2Ni3 2 were synthesized and characterized by single crystal X-ray structure analysis, X-ray powder diffraction, and IR spectroscopy. All Ln2Ni3 complexes crystallize as monoclinic crystals in the space group P21/c.

scholarly journals Synthesis, Structure, and Antiproliferative Activity of Three Gallium(III) Azole Complexes

2010 ◽  
Vol 2010 ◽  
pp. 1-10 ◽  
Author(s):  
Stergios Zanias ◽  
Giannis S. Papaefstathiou ◽  
Catherine P. Raptopoulou ◽  
Konstantinos T. Papazisis ◽  
Vasiliki Vala ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Single Crystal ◽  
Antiproliferative Activity ◽  
Bioinorganic Chemistry ◽  
Anionic Complex ◽  
X Ray ◽  
X Ray Crystallography ◽  
Mononuclear Complexes ◽  
Human And Mouse ◽  
Antiproliferative Activities

As part of our interest into the bioinorganic chemistry of gallium, gallium(III) complexes of the azole ligands 2,1,3-benzothiadiazole (btd), 1,2,3-benzotriazole (btaH), and 1-methyl-4,5-diphenylimidazole (L) have been isolated. Reaction of btaH or btd withGaBr3orGaCl3resulted in the mononuclear complexes[GaBr3(btaH)2](1) and[GaCl3(btd)2](2), respectively, while treatment ofGaCl3with L resulted in the anionic complex(LH)2[GaCl4](3). All three complexes were characterized by single-crystal X-ray crystallography and IR spectroscopy, while their antiproliferative activities were investigated against a series of human and mouse cancer cell lines.

Helical chain Ag(I) complexes with a tridentate N-donor ligand: syntheses, structural characterization, and properties

2015 ◽  
Vol 70 (12) ◽  
pp. 851-856 ◽  
Author(s):  
Chun-Hua Dai ◽  
Fu-Lin Mao
Keyword(s):  
Ir Spectroscopy ◽  
Single Crystal ◽  
Structural Characterization ◽  
Fluorescence Properties ◽  
Helical Chain ◽  
Donor Ligand ◽  
Thermogravimetric Analyses ◽  
X Ray

AbstractThe tridentate N-donor ligand 2,6-di(2-oxazolyl)pyridine (L) reacts with AgClO4 and AgPF6 to yield two new complexes, {[Ag5(L)5](ClO4)5}n (1) and {[Ag5(L)5](PF6)5}n (2), which have been characterized by single-crystal and powder X-ray diffractions, IR spectroscopy, and elemental and thermogravimetric analyses. Complexes 1 and 2 are isotypic, displaying helical chain structures. The fluorescence properties of 1 and 2 were investigated.

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