- An extensive class of solids full of holes large enough to enclose over 200 molecules of H2O
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(Figure Presented) Swiss cheese, Gromit! A new class of solids of widely variable composition has essentially the same crystal structure reminiscent of Emmental cheese (see picture). The presence of the roughly spherical holes in the structure, which are large enough to enclose around 200 water molecules, is a consequence of the edge-to-face agglomeration of 12 fluorene units into pseudospherical clusters.
- Abrahams, Brendan F.,FitzGerald, Nicholas J.,Robson, Richard
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- Preparation method of 9,9-di(4-hydroxy aryl) fluorene type compound
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The invention provides a preparation method of a 9,9-di(4-hydroxy aryl) fluorene type compound. The method is characterized in that 9-fluorenone type derivatives and aromatic phenol type compounds areused as raw materials; reaction is performed under the catalysis of active carclazyte, a crude product of the 9,9-di(4-hydroxy aryl) fluorene type compound is obtained; then, after purification, the9,9-di(4-hydroxy aryl) fluorene type compound product is obtained. The preparation method has the beneficial effects that the active carclazyte price is cheap; catalysts and reaction mother liquid canbe repeatedly used for many times; the operation is simple and convenient; the reaction time is short; the temperature controllability is high; the production cost is effectively reduced; the production efficiency is improved; in addition, the discharging of waste acid water and waste slag caused by reaction catalysts is greatly reduced; the environment pollution is reduced; the preparation method can be applicable to green and chemical sustainable development.
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Paragraph 0042; 0043
(2018/12/13)
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