Resonance Raman spectra and crystal structure of lithium phthalocyaninate(1−) iodine: a realistic model for the starch–iodine complex
✍ Scribed by B. Latte; A. Kienast; C. Bruhn; A. Loidl; H. Homborg
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 173 KB
- Volume
- 01
- Category
- Article
- ISSN
- 1088-4246
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✦ Synopsis
The lithium phthalocyaninate(1-) iodine inclusion complex [(Lipc -)•I], prepared by the reaction of anhydrous lithium iodide with molten 1,2-dicyanobenzene, crystallizes tetragonally in the space group P4/mcc with a = 14.057(3) Å, b = 6.397(1) Å, V = 1264.0(4) Å 3 , Z = 2. Lithium is in a crystallographically imposed strictly square planar coordination geometry with a Li-N distance of 1.940(7) Å. Linear chains of equidistant iodine atoms are segregated from adjacent metal-over-metal stacks of the planar lithium phthalocyaninate(1-) molecules, which are staggered by 40.2( 5)°. Resonance Raman spectra have been studied in comparison with those of the starch-iodine complex [(starch)•I]. The identity of the iodine chromophore in both complexes is essentially the same. It consists of an iodine chain in a hydrophobic environment. Its character is predominately 'aliphatic' in [(starch)•I] and 'aromatic' in [(Lipc -)•I].