Lipophilic cage ligands containing two tightly connected 1,7-dioxa-4,10-diazacyclododecane rings: synthesis and x-ray structure of a sodium perchlorate complex

1988 ◽  
Vol 53 (22) ◽  
pp. 5292-5298 ◽  
Author(s):  
Pier Lucio Anelli ◽  
Fernando Montanari ◽  
Silvio Quici ◽  
Gianfranco Ciani ◽  
Angelo Sironi
Keyword(s):  
Sodium Perchlorate ◽  
X Ray ◽  
Perchlorate Complex

The sodium perchlorate complex of cis-syn-cis dicyclohexano-24-crown-8 ether. X-ray crystal structure and solution conformations as studied by variable temperature 13C NMR spectroscopy at 125 MHz. An example of eight-coordinate sodium

1992 ◽  
Vol 70 (6) ◽  
pp. 1688-1695 ◽  
Author(s):  
G. W. Buchanan ◽  
Y. Lear ◽  
C. Bensimon
Keyword(s):  
Crystal Structure ◽  
Variable Temperature ◽  
Sodium Perchlorate ◽  
13C Nmr Spectroscopy ◽  
Ring Inversion ◽  
X Ray ◽  
Free Energy Of Activation ◽  
Perchlorate Complex ◽  
C Nmr ◽  
Coalescence Temperature

The major isomer obtained by hydrogenation of dibenzo-24-crown-8 ether is shown to have the cis-syn-cis configuration as determined from the crystal structure of its sodium perchlorate complex. This material possesses eight-coordinate sodium with Na—O distances ranging from 2.54 to 2.78 Å. The complex is shown to exist in a single asymmetric conformation below 240 K as determined by 13C NMR at 125 MHz. From NMR coalescence temperature measurement, the free energy of activation for cyclohexane ring inversion in this complex has been determined to be 51.0 ± 0.6 kJ/mol.

scholarly journals Zn(II) Complex for Highly Sensitive and Selective Detection of Acetone at Room Temperature

2019 ◽  
Author(s):  
Mohd. Muddassir ◽  
Abdullah Alarifi ◽  
Mohammad Usman
Keyword(s):  
Room Temperature ◽  
High Selectivity ◽  
Resonance Spectroscopy ◽  
Monoclinic Space Group ◽  
Selective Detection ◽  
X Ray ◽  
X Ray Crystallography ◽  
Highly Sensitive ◽  
Vis Spectroscopy ◽  
Perchlorate Complex

A Zn(II) perchlorate complex has been prepared and characterized by single X-ray crystallography, nuclear magnetic resonance spectroscopy, thermogravimetric analysis, infrared spectroscopy, elemental analysis, and UV-vis spectroscopy. The complex crystallizes in the monoclinic space group P21/c (Z = 4) with a pentacoordinated zinc center. Interestingly, the Zn complex was found be to a potential fluorophore that could sense acetone and other ketones with high selectivity and sensitivity.

scholarly journals Self-Propagating High-Temperature Synthesis of Chromium Substituted Lanthanide – Barium – Copper Oxides, LnBa2Cu3-xCrxO7-y (Ln = Y; La; Nd; Sm and Yb)

2017 ◽  
Vol 4 (2) ◽  
pp. 73 ◽  
Author(s):  
Maxim V. Kuznetsov ◽  
Ivan P. Parkin ◽  
Yuri G. Morozov ◽  
Alexander G. Merzhanov
Keyword(s):  
Magnetic Susceptibility ◽  
High Temperature ◽  
Sodium Perchlorate ◽  
Earth Metal ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Barium Copper ◽  
Chromium Substitution

<p>A series of MBa<sub>2</sub>Cu<sub>3-x</sub>CrxO<sub>7-y</sub> (M = Y; La; Nd; Sm and Yb; <em>x </em>= 0, 0.05, 0.15, 0.25) materials were synthesized in air by self-propagating high-temperature synthesis (SHS) involving reaction of stoichiometric mixtures of rare-earth metal (III) oxide, barium peroxide, copper metal, chromium (III) oxide and sodium perchlorate. All the SHS processes were followed by sintering in oxygen at 950 °C for 2h. The products were characterized by SEM, X-ray powder diffraction, UV, superconductive transition temperatures (T<sub>c</sub>) and magnetic susceptibility (χ) measurements. X-ray diffraction data showed that single phase orthorhombic (or tetragonal for M = Nd) materials were produced. All series of materials showed a systematic increase in lattice parameters and unit cell volume with chromium content (M = Y: <em>x </em>= 0, <em>V </em>= 174.25 Å3; <em>x </em>= 0.25, <em>V </em>= 175.10 Å3). Thermal stability of all the SHS prepared materials increased with <em>x</em>. Oxygen content of all the samples increased with <em>x</em>, but did not exceed 7.0. Superconductivity transition temperature decreased with chromium substitution in all systems (98-77 K). Magnetic susceptibility decreased with chromium substitution.</p>

13C and1H two-dimensional NMR characterization of the sodium perchlorate complex of a new tetraoxatetraaza lipophilic cage ligand

1986 ◽  
Vol 24 (8) ◽  
pp. 692-698 ◽  
Author(s):  
P. L. Anelli ◽  
F. Montanari ◽  
H. Molinari ◽  
S. Quici ◽  
T. Beringhelli
Keyword(s):  
Sodium Perchlorate ◽  
Two Dimensional ◽  
Nmr Characterization ◽  
Perchlorate Complex
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