The crystal structure of Zn4O(CH3COO)6 has been examined by the method of X-ray Fourier analysis (Fe Kα, λ=1.937 Å). The general features of the structure reported by Wyart in 1926 are confirmed and the atomic co-oridinates which hitherto remained unfixed have been completely determined. Lengths of Zn-O bonds are 1.96 and 1.98 Å respectively, which are in good accord with those found in crystals of ZnO. The significance of the structure is discussed briefly and compared with that of Be4O(CH3COO)6.
The crystal structure of histidine hydrochloride monohydrate has been refined. The crystals are orthorhombic P21212~, a= 15.301 (3), b= 8.921 (2), c= 6.846 (2) ~, Z=4. The intensities were measured with an automatic four-circle diffractometer using Mo K~ radiation. The structure was solved by the program SEARCHER, for the automatic heavy-atom analysis, and refined by full-matrix least-squares calculations to a final R of 0.037 for 1079 independent observed reflexions.
One of the gamones (gamone II) which are effective for the induction of conjugation in
Blepharisma intermedium
has been isolated in a crystalline form and designated as blepharismin. From the result of chemical and spectroscopic investigations, in which x-ray crystallographic analysis was used as a definitive tool, blepharismin has been found to have the structure of calcium 3-(2′-formylamino-5′-hydroxybenzoyl)lactate.
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