title: (5-tert-Butylporphyrinato)copper(II), a nonplanar porphyrin with only one sterically demanding meso residue.
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.
authors.affiliation: SFI Tetrapyrrole Laboratory, School of Chemistry, Trinity College Dublin, Ireland. sengem@tcd.ie
authors.forename: Mathias O
authors.initials: MO
authors.lastname: Senge