Porphyrin-Based Metal Organic Frameworks: Unusual examples of Mn(II) carboxylate frameworks containing free-base porphyrins.

Victoria J. Richards, William Lewis, Alexander J. Blake and Neil R. Champness
  • 1 University of Nottingham, School of Chemistry, Nottingham, Großbritannien
  • 2 University of Nottingham, School of Chemistry, Nottingham, Großbritannien
  • 3 University of Nottingham, School of Chemistry, Nottingham, Großbritannien

Abstract

The structures of two porphyrin-based metal-organic frameworks are reported. The reaction of a carbäoxylic acid functionalised porphyrin with Mn(NO3)2 gives rise to either a one-dimensional or a two-dimensional framework structure depending on the reaction solvent employed. 1 (a = 8.3080(5) Å, b = 14.4466(10) Å, c = 21.8737(14) Å, α = 99.182(6)°, β = 94.118(5)°, γ = 92.562(5)°, P-1, R1 = 0.0894, wR2 = 0.2850) consists of one-dimensional coordination polymers linked through hydrogen-bonded porphyrin molecules leading to a two-dimensional array. In contrast 2 (a = 13.6852(6) Å, b = 41.1655(15) Å, c = 15.4535(6) Å, β = 109.954(5)°, P21/c, R1 = 0.1218, wR2 = 0.3806) consists of two-dimensional sheets, constructed from dinuclear Mn(II) clusters and bridging porphyrin ligands, which, as in 1, are linked through hydrogen-bonded porphyrin molecules but in this case leading to a three-dimensional array. In both structures it is notable that the porphyrin molecules do not bind the Mn(II) cations through the macrocyclic carity, rather both structures.

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Zeitschrift für Kristallographie – Crystalline Materials offers a place for researchers to present results of their crystallographic studies. The journal includes theoretical as well as experimental research. It publishes Original Papers, Letters and Review Articles in manifold areas of crystallography.

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