Radially π-Extended Pyrrole-Fused Azacoronene: A Series of Crystal Structures of HPHAC with Various Oxidation States

2021 ◽  
Vol 86 (5) ◽  
pp. 4290-4295 ◽  
Author(s):  
Yoshiki Sasaki ◽  
Masayoshi Takase ◽  
Nagao Kobayashi ◽  
Shigeki Mori ◽  
Keishi Ohara ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Oxidation States

scholarly journals Spotlight on Alkali Metals: The Structural Chemistry of Alkali Metal Thallides

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1013
Author(s):  
Stefanie Gärtner
Keyword(s):  
Crystal Structure ◽  
Alkali Metal ◽  
Crystal Structures ◽  
Alkali Metals ◽  
Valence Electron ◽  
Oxidation States ◽  
Valence Electron Concentration ◽  
Base Metals ◽  
Charge Balancing

Alkali metal thallides go back to the investigative works of Eduard Zintl about base metals in negative oxidation states. In 1932, he described the crystal structure of NaTl as the first representative for this class of compounds. Since then, a bunch of versatile crystal structures has been reported for thallium as electronegative element in intermetallic solid state compounds. For combinations of thallium with alkali metals as electropositive counterparts, a broad range of different unique structure types has been observed. Interestingly, various thallium substructures at the same or very similar valence electron concentration (VEC) are obtained. This in return emphasizes that the role of the alkali metals on structure formation goes far beyond ancillary filling atoms, which are present only due to charge balancing reasons. In this review, the alkali metals are in focus and the local surroundings of the latter are discussed in terms of their crystallographic sites in the corresponding crystal structures.

Synthesis, characterization, and crystal structures of uranyl compounds containing mixed chromium oxidation states

2012 ◽  
Vol 191 ◽  
pp. 162-166 ◽  
Author(s):  
Daniel K. Unruh ◽  
Andrew Quicksall ◽  
Laura Pressprich ◽  
Megan Stoffer ◽  
Jie Qiu ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Oxidation States ◽  
Uranyl Compounds ◽  
Chromium Oxidation

scholarly journals Reduction of hypervalent iodine by coordination to iron(iii) and the crystal structures of PhIO and PhIO2

2016 ◽  
Vol 45 (44) ◽  
pp. 17714-17722 ◽  
Author(s):  
Christina Wegeberg ◽  
Christian Grundahl Frankær ◽  
Christine J. McKenzie
Keyword(s):  
Crystal Structures ◽  
Oxidation States ◽  
Hypervalent Iodine

Iodine L3-edge XANES spectra using reference compounds with formal iodine oxidation states spanning −1 to +7 show that iodine in an Fe(iii) coordinated iodosylbenzene (PhIO) is reduced compared to parent hypervalent PhIO which has been structurally characterized.

scholarly journals Synthesis, Crystal Structures, and Spectroscopic Properties of Novel Gadolinium and Erbium Triphenylsiloxide Coordination Entities

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 147
Author(s):  
Patrycja Wytrych ◽  
Józef Utko ◽  
Julia Kłak ◽  
Maciej Ptak ◽  
Mariusz Stefanski ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Variable Temperature ◽  
Magnetic Interaction ◽  
Spectroscopic Properties ◽  
Lanthanide Ions ◽  
Oxidation States ◽  
Crystal Field Effect ◽  
Spectroscopy Studies ◽  
Behavior Characteristics

In alkali metal and lanthanide coordination chemistry, triphenylsiloxides seem to be unduly underappreciated ligands. This is as surprising as that such substituents play a crucial role, among others, in stabilizing rare oxidation states of lanthanide ions, taking a part of intramolecular and molecular interactions stabilizing metal-oxygen cores and many others. This paper reports the synthesis and characterization of new lithium [Li4(OSiPh3)4(THF)2] (1), and sodium [Na4(OSiPh3)4] (2) species, which were later used in obtaining novel gadolinium [Gd(OSiPh3)3(THF)3]·THF (3), and erbium [Er(OSiPh3)3(THF)3]·THF (4) triphenylsiloxides. Crystal structures were determined for all 1–4 compounds, and in addition, IR, Raman, absorption spectroscopy studies were conducted for 3 and 4 lanthanide compounds. Furthermore, direct current (dc) variable-temperature magnetic susceptibility measurements on polycrystalline samples of 3 and 4 were carried out in the temperature range 1.8–300 K. The 3 shows behavior characteristics for the paramagnetism of the Gd3+ ion. In contrast, the magnetic properties of 4 are dominated by the crystal field effect on the Er3+ ion, masking the magnetic interaction between magnetic centers of neighboring molecules.

Crystal structures of benzoxazolyl–copper(iii,ii,i) complexes and investigation of Cu(ii)-mediated aryl carbon–hydrogen bromination

2015 ◽  
Vol 44 (21) ◽  
pp. 9921-9926 ◽  
Author(s):  
Lianke Wang ◽  
Hongping Zhou ◽  
Jieying Wu ◽  
Yupeng Tian
Keyword(s):  
Crystal Structures ◽  
Copper Complexes ◽  
Oxidation States ◽  
System P

We report three new copper complexes with different oxidation states based on the phenylbenzoxazole system.

scholarly journals Single crystal structures and theoretical calculations of uranium endohedral metallofullerenes (U@C2n, 2n = 74, 82) show cage isomer dependent oxidation states for U

2017 ◽  
Vol 8 (8) ◽  
pp. 5282-5290 ◽  
Author(s):  
Wenting Cai ◽  
Roser Morales-Martínez ◽  
Xingxing Zhang ◽  
Daniel Najera ◽  
Elkin L. Romero ◽  
...  
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Oxidation State ◽  
Theoretical Calculations ◽  
State Dependence ◽  
Oxidation States ◽  
Metal Oxidation ◽  
X Ray ◽  
Endohedral Metallofullerenes ◽  
Single Crystal Structures

First X-ray structures and metal oxidation state dependence on cage isomerism for U-EMFs.

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