X-Ray Analysis of Crystal Structure of Picrates of many kinds of Organic Compounds

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Picric acid forms stable picrates with various organic molecules through pi-bonding or ionic bonding, and such picrates have been very useful for identification and qualitative analysis. But there have been only a few studies on their crystal structures. As it desirable to determine the crystal structures and the bonding mode of picrates of basic compounds, we have syatematically investigated the crystal structures of basic organic compounds. We have determined crystal structures of picrate of aromatic hydrocarbon (benzene, omicron-, m-, p-phenylendiamine), amino acid(glycin), drug(procaine).From the above results, picrate of aromatic hydrocarbons are formed through pi-bonding. Picrates of amino compounds are mainly formed through ionic bonding, but some of them are formed by both pi- and ionic bondings.