A New Cobalt(II)‐Layered Network Based on Phenyl(carboxymethyl) Phosphinate

Abstract

In the presence of 4,4′‐bipyridine (4,4′‐bipy) and CoII metal ions, a bifunctional phosphinate‐carboxylate ligand, phenyl(carboxymethyl) phosphinate (pcc), forms a new polymeric metal‐organic framework (MOF), [[Co(pcc)(4,4′‐bipy)(H2O)](H2O)1.5]n (1). The structure consists of 2D slabs connected by solvent water molecules with cobalt metal atoms in two different coordination environments. The temperature‐dependent X‐ray powder diffraction analysis of 1 shows the formation of dehydrated phases in the range 120–180 °C. The dehydration–rehydration process is reversible. The overall magnetic behaviour of complex 1 is dominated by single ion effects with only weak exchange coupling interactions, due to the syn/anti conformation of the Co–O–C–O–Co path.

Novel Cobalt(II) Coordination Polymers Constructed from 3,3′,4,4′-Oxydiphthalic Acid and N-Donor Ligands: Syntheses, Crystal Structures, and Magnetic Properties

“…The positive zJ value, although small, indicates the weak ferromagnetic coupling between the Co(II) ions mediated by syn,anti-carboxylate bridges as discussed by Costantino and Lloret. 23,24 The temperature-dependent magnetic susceptibility of complex 3 is similar to 1 owing to their similar metal connection modes. As shown in Figure 6, at 300 K, the χ M T value equals 3.21 cm 3 K mol À1 , and after decreasing upon cooling to a minimum of 1.98 cm 3 K mol À1 at 3.5 K, it increases to 2.02 cm 3 K mol À1 at 1.8 K. The data between 30 and 300 K are fitted by the CurieÀWeiss Law and gives C = 3.28 cm 3 K mol À1 and θ = À15.76 K. As discussed for 1, the negative θ value does not necessarily stand for antiferromagnetic coupling because of the existence of strong spinÀorbit coupling for Co(II) ions.…”

Layer like porous materials with hierarchical structure

“…The simplest type of layered MOF is the case of frame-like monolayers that are stacked together [136][137][138][139][140] ( Figure 4A). They can be modified to build classic 3D, 141 interpenetrated 3D ( Figure 4B), [142][143][144][145][146] separated 147 and interpenetrated bilayers 148 (Figure 4 F and D, correspondingly). On the other hand a 3D structure can be disassembled into 2D layers.…”

The First Family of Actinide Carboxyphosphinates: Two‐ and Three‐Dimensional Uranyl Coordination Polymers

“…Up to now, only a number of metal phosphinates have been reported. [2][3][4][5] Compared with the corresponding phosphonate ligand in which the PO 3 group possesses three potential donor oxygen atoms capable of bonding to metals, the phosphinate moiety (-PO 2 -) has fewer oxygen atoms to supply. However, an additional organic group is further bonded to the phosphinate ligand, thus a better modulation and adjustment of the substituent would bring about structural diversities of the resultant coordination polymers.…”