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Reactions of free-base tetra(4-carboxyphenyl)porphyrin with lanthanide ions as Pr 3+, Dy 3+, and Nd 3+ led to open metal−organic framework solids sustained by polynuclear metal−carboxylate clusters. Their three-dimensional structures are characterized by channel voids accessible to other guest components (e.g., water, small organics). Crystalline solids obtained by the hydrothermal synthesis with Dy 3+ and Nd 3+ reagents reveal remarkable stability and represent the first example of hybrid porphyrin-lanthanide single framework architectures.
George et al. (Tue,) studied this question.