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A third crystalline modification of dodecaphenylporphyrin is described in which the pyrrole nitrogen atoms are hydrogen-bonded to two ethanol molecules. This is the first crystallographic proof for the accessibility of nitrogen atoms in saddle-distorted free base porphyrins for hydrogen bonding. No such coordination is possible in either planar or ruffled porphyrins. Thus, the possibility exists to utilize conformationally distorted porphyrins for the binding of neutral m olecules
Keywords: Porphyrins; Steric Strain; Conformational Flexibility; Crystal Structure; Hydrogen Bonding
Received: 1999-3-2
Published Online: 2014-6-2
Published in Print: 1999-6-1
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