A New Quartz-like Metal–Organic Framework Constructed from a Versatile Pyrazole-Based Spacer

Abstract

Two new coordination polymers, 1 ∞ [Cu 2 (L) 4 -(MeOH)]•MeOH (1) and 3∞ [Cu(L) 2 ]•5H 2 O (2), have been obtained exploring the potential of 5-amino-1-phenyl-1Hpyrazole-4-carboxylate (L − ) to act as a spacer. The different architectures of these compounds arise from the versatility of this organic ligand. In compound 1, the carboxylato groups (syn-syn bridging mode) and the copper ions generate a binuclear paddle-wheel motif. Each binuclear entity coordinates to another one, through one out of the four pyrazole rings, resulting in double chains. In crystal 2, the organic ligand is coordinated to a copper ion through the carboxylato group (asymmetric chelating) and to another copper ion through the pyrazole nitrogen atom. Compound 2 crystallizes in the hexagonal system with the chiral space group P6 1 22, featuring a quartz-like topology. The magnetic properties of both compounds have been investigated.

Dynamics of Water Molecules in a 3-Fold Interpenetrated Hydrogen-Bonded Organic Framework Based on Tetrakis(4-pyridyl)methane

“…In particular, we obtained unique 3-fold interpenetrated quartz-like network structures from the perchlorate and tetrafluoroborate salts. Although a number of quartz type frameworks have been reported, little study has been done to apply them to functional host–guest systems. − In this paper, we shed light on the dynamics of our system based on the quartz-type interpenetrating HOF and incorporated one-dimensional molecular chains of water. In particular, we paid attention to the flexibility of the host framework inherent both in hydrogen bonds and interpenetrations.…”