Crystal structure of diaqua-bis(2-(4-carboxyphenyl)acetato-κO)-bis(1,3- di(pyridin-4-yl)propane-κN)cobalt(II), C44H46CoN4O10

Abstract

Source of materialThe mixtures of 4-carboxyphenylacetic acid (0.2 mmol, 37.4 mg), 1,3-di(pyridin-4-yl)propane (bpp) (0.1 mmol, 19.8 mg), Co(OAC) 2 ·4H 2 O (0.1 mmol, 24.9 mg), NaOH (0.1 mmol), and H 2 O (7.0 ml) were placed in a 23 ml Teflon lined stainless steel reactor. The vessel was heated to 393K for 4 days, and then slowly cooled to room temperature. Brown, block-shaped crystals were obtained, crystals were filtered off, washed with mother liquid, and dried under ambient conditions. Discussion Metal-organic frameworks (MOFs) with well-regulated network structures have provoked significant interest as functional materials displaying potential applications in such fields as magnetism, molecular separation, catalysis, luminescence, and molecule storage [1][2][3][4][5]. Aromatic multi-carboxylate ligands are good candidates for the construction of the layers, wherein diverse binding modes of the carboxylates help enhance the robustness of metalcarboxylate networks [6,7]. Dipyridyl-type ligands are desired pillar spacers, which can allow easy control of channel dimensions between the metal-carboxylate layers. The key to synthesize MOFs with permanent porosity is to prevent the disruption of framework integrity even after guest elimination. Though the reports concerning this aspect are emerging, it has still been a tremendous challenge to obtain the dynamic microporous MOFs [8,9]. The asymmetric unit of the title complex contains one 1,3-di(pyridin-4-yl)propane (bpp) ligand, one-half Co ion, one 2-(4-carboxyphenyl)acetato ligand and one coordinated water molecule as shown in Fig.