meantimc the first successful crystal structure analysis of a "cobaltocenium-Angiw Ciiem. Int Ed. Engl. 1995, 34, No. 11 VCH Verlag.~gesrllsciiaft mbH, 0-6945'1 Weinheim. 1995 Oj70-0833,'95/1111-1201 B l~l.Ofl+ ..?j:(I
WaterÈmethanol and waterÈacetonitrile, which show exothermic and endothermic mixing, respectively, represent good contrast in non-ideality of a binary mixture. The microscopic structure observed through the mass-spectrometric analysis of clusters isolated from solution also shows good contrast between these binary mixtures as follows : (1) methanol molecules have substitutional interaction with water clusters, while acetonitrile molecules have additional interaction with water clusters ; (2) the clustering of methanol molecules are promoted in the presence of water ; on the contrary, the acetonitrile clusters are disintegrated in the presence of water. Such Ðndings could partially explain the non-ideality of these binary mixtures on the basis of the cluster structures.
A hydrothermal procedure is used to prepare the molecular sieve Al2 (CH3PO3)3 (1). This compound has a new three‐dimensional framework, in which one six‐coordinate and two four‐coordinate Al centers are bound to the CH3PO3 units. The channel walls of the micropores of 1 are probably not lined with O atoms but with methyl groups.
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