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|Section2= |Section3= }} Porphin, sometimes spelled porphine, is the parent chemical compound for types of biochemically significant compounds called porphyrins. The chemical formula of porphin is C20H14N4. Porphin is an organic compound that is aromatic and heterocyclic since its chemical structure, shown at right, essentially consists of four pyrrole rings joined together by four methine (=CH—) groups to form a larger macrocycle ring. The compound itself is a solid. == Structural characteristics of porphin == Around the perimeter of the macrocycle ring, there is a cyclic chain of sp2 hybridized carbon atoms, all of which are part of a conjugated double bond system, giving the molecule its aromatic character. Resonance structures for porphin can be drawn as shown below here. The aromatic character of porphin stems both from its conjugation as well as its flat or planar geometry, meaning that all the atoms lie in a single plane. Bonded to the cyclic chain of carbons are four nitrogen atoms facing the center of the molecule, two of which are bonded to hydrogen atoms and the other two nitrogens forming part of the conjugated double bond system. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Porphin」の詳細全文を読む スポンサード リンク
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