The crystal and molecular structures of sodium and barium complexes of dibenzo-24-crown-8 ether
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Uwe Schilde
Abstract
The sodium and barium isothiocyanate complexes of 6,7,9,10,12,13,20,21,23,24,26,27-dodecahydro-dibenzo[b,n]-1,4,7,10,13,16,19,22-octaoxacyclotetracosin (dibenzo-24-crown-8 ether=DB24C8) were synthesized and analyzed by X-ray diffraction.
The sodium complex, [Na(DB24C8)(NCS)(H2O)] 1, crystallizes in the orthorhombic space group Fdd2 with 16 molecules in the unit cell. The coordination number of Na is 6 and the central ion is located in a distorted octahedric environment. Only four of the crown ether oxygen atoms are involved. The coordination polyhedron is completed by the isothiocanate anion and by a water molecule, which is stabilized by hydrogen bonds.
The barium complex, [Ba(DB24C8)(NCS)2] 2, crystallizes in the trigonale space group P3121 with 3 molecules in the unit cell. Crystallographic C2 symmetry is observed for the complex. The coordination number of Ba is 10. Barium is coordinated with the eight oxygen atoms of the macrocyclic ligand and with two isothiocyanate anions. The absolute structure was estimated using the FLACK parameter.
© by Oldenbourg Wissenschaftsverlag, München
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- Books Received
Articles in the same Issue
- Crystal structure of new lanthanide diphosphates KLnP2O7 · 2 H2O (Ln = Gd, Tb, Yb)
- Annealing effects, anomalous dielectric properties and conductivity of As-diluted lead phosphate Pb3(P1–xAsxO4)2
- Effect of hydrostatic pressure on the crystal structure of sodium oxalate: X-ray diffraction study and ab initio simulations
- The transformation mechanism of the sodalite- to the melilite-topology: Thermal expansion and decomposition of bicchulite-type to melilite-type compounds
- Ab initio crystal structure determination of Bi6Rh12O29 from powder diffraction data
- The crystal structure of natural 33R moissanite from Tibet
- Structure, phase transitions and dielectric properties of a new inclusion compound of bis-thiourea pyridinium nitrate salt
- Self-association and stereochemistry study of (5R)-4-methyl-5-phenyl-1,3,4-oxadiazinan-2-one
- The crystal and molecular structures of sodium and barium complexes of dibenzo-24-crown-8 ether
- Books Received
