Synthesis and Characterization of a New Class of Asymmetric Aqua-Acetate Bridged Dimers. Solid State Molecular Structures of the [M2(.mu.-H2O)(.mu.-OAc)2(OAc)3(Py)2]- Anions (M = Mn(II), Fe(II), Co(II)). A Structural Model for the Fe2 Site in Methane Monooxygenase

1995 ◽  
Vol 117 (28) ◽  
pp. 7570-7571 ◽  
Author(s):  
D. Coucouvanis ◽  
R. A. Reynolds ◽  
W. R. Dunham
Keyword(s):  
Solid State ◽  
Structural Model ◽  
Methane Monooxygenase ◽  
Molecular Structures ◽  
Synthesis And Characterization ◽  
New Class

Synthesis and Characterization of Ruteno-Cuprates by Solid State Reactions

2008 ◽  
Vol 591-593 ◽  
pp. 644-648
Author(s):  
J.M.A. Gimenez ◽  
Carlos Roberto Grandini ◽  
A.R. Jurelo
Keyword(s):  
Solid State ◽  
Low Temperatures ◽  
Magnetic Transition ◽  
Solid State Reactions ◽  
Synthesis And Characterization ◽  
Superconducting Properties ◽  
New Class ◽  
Preparation Conditions ◽  
Magnetic States

A new class of hybrid ruteno-cuprates – such as Ru-1212 and Ru-1222 – was discovered in 1995 by Bauerfeind and collaborators. These materials present superconducting and magnetic states at low temperatures, an atypical duality in other superconductors. The superconductivity is more easily observed in Ru-1222, while Ru-1212 is a more problematic case, due to the strong effects of the preparation details in its superconducting properties, becoming the material superconductor or not. Ru-1212 presents a critical temperature that can vary between 0 and 46 K, depending on the preparation conditions, and a temperature of magnetic transition of around 132 K. The samples were prepared through solid state reactions, by using a mixture of high purity powders, followed by calcination and sinterization in the nitrogen and oxygen atmospheres. This paper shows the preparation process of Ru-1212 samples, followed by their structural and magnetic characterization.

scholarly journals Synthesis and Characterization of New Cyclam-Based Zr(IV) Alkoxido Derivatives

Reactions ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 323-332
Author(s):  
Luis G. Alves ◽  
Ana M. Martins
Keyword(s):  
Carbon Dioxide ◽  
Solid State ◽  
Molecular Structures ◽  
Synthesis And Characterization ◽  
Metal Centers ◽  
Trigonal Prismatic

In this study, new mono- and di-alkoxido zirconium(IV) complexes supported by tetradentate dianionic cyclam ligands were synthesized and characterized. These compounds were obtained by reaction of the parent Zr(IV) dichlorido species with one or two equivalents of the corresponding lithium alkoxido, whereas (3,5-Me2Bn2Cyclam)Zr(OPh)2 was prepared by protonolysis of the orthometallated species (3,5-Me-C6H4CH2)2Cyclam)Zr with phenol. The solid-state molecular structures of (Bn2Cyclam)ZrCl(OtBu) and (4-tBuBn2Cyclam)Zr(OiPr)2 show a trigonal prismatic geometry around the metal centers. (Bn2Cyclam)Zr(SPh)(OtBu) and (Bn2Cyclam)ZrMe(OiPr) were prepared by reaction of (Bn2Cyclam)ZrCl(OR) (R = iPr, tBu) with one equivalent of LiSPh or MeMgCl, respectively. The reactions of (Bn2Cyclam)Zr(OiPr)2 and (4-tBuBn2Cyclam)Zr(OiPr)2 with carbon dioxide suggested the formation of species that correspond to the addition of four CO2 molecules.

Synthesis and characterization of intramolecularly coordinated alanes with new sterically demanding trisyl-based ligands

2007 ◽  
Vol 85 (7-8) ◽  
pp. 483-490 ◽  
Author(s):  
Clinton L Lund ◽  
Olimpiu Stanga ◽  
J Wilson Quail ◽  
Jens Müller
Keyword(s):  
Solid State ◽  
Molecular Structures ◽  
Synthesis And Characterization ◽  
Ortho Position ◽  
Donor Group ◽  
Pyridyl Group ◽  
X Ray ◽  
Sterically Demanding ◽  
Derivatives Of

Five new intramolecularly coordinated aluminum species, whose molecular structures have been elucidated in solution by NMR spectroscopy and in the solid state by single crystal X-ray analysis, are described. All species are equipped with a trisyl-based ligand with a pyridyl donor group [Pytsi stands for -C(SiMe3)2SiMe2(2-C5H4N)]. While the compound (Pytsi)AlMeCl was accessible either from Li(THF)(Pytsi) and MeAlCl2 or from (Pytsi)AlCl2 and LiMe, the tert-butyl derivative (Pytsi)AltBuCl could only be obtained from Li(THF)(Pytsi) and tBuAlCl2. Attempted synthesis of (Pytsi)AltBuCl from (Pytsi)AlCl2 and LitBu or from (Pytsi)AlCl2 and tBuMgCl failed. Three other compounds (3-5) were synthesized and can be described as derivatives of (Pytsi)AlMe2 with additional groups in the ortho position of the pyridyl group. Compound 3 carried a Me group in the ortho position, while compounds 4 and 5 were equipped with Ph and 2,6-diisopropylphenyl moieties, respectively.Key words: aluminum, trisyl ligands, methyl alanes.

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