A synchrotron study of [5,10,15,20-tetrakis(3-cyanophenyl)porphyrinato-kappa N-4(5),N-10,N-15,N-20]copper(II) nitrobenzene trisolvate at 80 K-1

作者：Seidel Ruediger W^*; Goddard Richard; Mayer Gall Thomas; Oppel Iris M

来源：Acta Crystallographica Section C-Structural Chemistry, 2016, 72(11): 861-+.

DOI：10.1107/S2053229616015515

• porphyrin
• crystal structure
• planar macrocycle
• fourfold symmetry
• copper(II)
• synchrotron

Porphyrin assemblies display interesting photophysical properties and a relatively high thermal stability. Moreover, meso-functionalized porphyrins with virtually fourfold symmetry can be relatively readily synthesized from pyrrole and the appropriate aldehyde. A number of metallo derivatives of 5,10,15,20-tetrakis(4-cyanophenyl) porphyrin, where the N atom of the linear cyano group can act both as a donor for coordination bonds or as an acceptor for hydrogen bonds, have been structurally characterized by single-crystal X-ray analysis. The supramolecular and structural chemistry of the corresponding 2- and 3-cyanophenyl isomers of the parent porphyrin, however, has remained largely unexplored. The crystal structure of [5,10,15,20-tetrakis(3-cyanophenyl) porphyrinato] copper(II) (CuTCNPP) nitrobenzene trisolvate, [Cu(C48H24N8)]center dot 3C(6)H(5)NO(2), has been determined at 80 K by synchrotron single-crystal X-ray diffraction. CuTCNPP exhibits a C-2h-symmetric alpha alpha beta beta conformation, despite an unsymmetrical crystal environment, and is situated on a crystallographic centre of symmetry. The Cu-II ion adopts a genuine square-planar coordination by the four pyrrole N atoms. The 24-membered porphyrin ring system shows no marked deviation from planarity. In the crystal, the CuTCNPP molecules and two nitrobenzene molecules are face-to-face stacked in an alternating fashion, resulting in corrugated layers. The remaining nitrobenzene guest molecule per CuTCNPP resides in the region between four neighbouring columnar stacks of CuTCNPP and sandwiched nitrobenzene molecules, and is disordered over four positions about a centre of symmetry.

• 出版日期2016-11