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  • Title: (5-tert-Butylporphyrinato)copper(II), a nonplanar porphyrin with only one sterically demanding meso residue.
    Author: Senge MO.
    Journal: Acta Crystallogr C; 2011 Feb; 67(Pt 2):m39-42. PubMed ID: 21285493.
    Abstract:
    The title compound, [Cu(C(24)H(20)N(4))], is a rare example of a porphyrin carrying only one substituent. Its crystal structure exhibits two molecules in the asymmetric unit. The bulky meso tert-butyl residue gives rise to a nonplanar macrocycle with significant ruf and sad distortions. As a result of the position of the substituent, the conformational effects are unsymmetric and to a significant extent localized in the affected quadrant of the macrocycle. In line with results for highly substituted nonplanar porphyrins, comparison with a free base and a nickel(II) complex shows that the conformation of the macrocycle is modulated via additional metal effects.
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