The crystal structure of the low-temperature phase of (NO)2SnCl6 and ordering of the NO+ ions
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Henning Henke
Abstract
At ambient conditions (NO)2SnCl6 is isostructural with the corresponding titanium and vanadium salts which all crystallize in space group P4/mnc (Z = 2) and display a fourfold disorder of the NO+ ions. Below Tc = 229 K the diffraction pattern splits into the components of a quadruplet twin, but unlike for (NO)2VCl6 remarkable discontinuities of the lattice parameters are not observed.
The transition from P4/mnc to space group P21/n (Z = 2) occurs in only one step which at Tc = 153 K, the temperature of the crystal structure determination, consists of an adaptive tilt (5.3°) of the SnCl62– octahedra leading to a reduction of the cationic disorder from four to merely two N—O alignments, which are differently populated. Despite of the continuously proceeding transition, the phase change from the high- to the low-temperature regime has to be classified as a 1st order process.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- The crystal structure of the low-temperature phase of (NO)2SnCl6 and ordering of the NO+ ions
- Solvothermal synthesis, crystal structure and properties of a novel zinc porphyrin
- Iridium(III) products isolated in a reaction of IrCl3 with phenyl 2-pyridyl ketoxime
- Tautomers and polymorphs of pyrazolinone derivatives, generated from reactions of arylhydrazines, ArNHNH2, with 1,3-dicarbonyl compounds
- Synthesis and characterization of Tetrakis-μ-[N-phenylanthranilato](O,O′)-bis[(4-vinylpyridine copper(II)] complex
- Two dimensional cyano-bridged heteropolynuclear complex containing Pd ···π interactions
- The twinning of two closely related phenylisoxazoles interpreted according to order-disorder theory
