Synthesis and Structural Properties of the Binary Framework C-N Compounds of Be, Mg, Al, and Tl
Abstract
The synthesis of crystalline Be(CN)2 and Mg(CN)2 has been demonstrated and X-ray diffraction studies indicate simple-cubic structures with four-coordinate metal atoms surrounded by an average of two N and two C atoms. The symmetry of Be(CN)2 is Pnoverline3m, a=5.339(1) Å, Z=2. The symmetry of Mg(CN)2 is also Pnoverline3m, a=6.122(1) Å, Z=2. A thallium cyanide with composition Tl(CN)2 was prepared and was shown to have a similar simple-cubic structure with a=6.660(1) Å. On the basis of the X-ray diffraction pattern, IR spectra, and combustion analysis, this material is assigned the formula TlITlIII(CN)4. Crystalline Al(CN)3 with simple-cubic structure has been prepared for the first time. Rietveld refinement indicated that the structure in- corporates CN groups with orientational disorder in a Prussian- blue-like octahedral network. 27Al NMR spectroscopy confirmed C,N disorder in cubic Al(CN)3. The symmetry for Al(CN)3 is Pmoverline3m, a=5.205(1) Å.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- June 2001
- DOI:
- 10.1006/jssc.2001.9192
- Bibcode:
- 2001JSSCh.159..244W
- Keywords:
-
- main-group cyanides;
- Prussian blue;
- framework structures.