Untitled

Self-assembly of iron TCPP (meso-tetra(4-carboxyphenyl)porphyrin) into a chiral 2D coordination polymer

“…Some of these combinations are specially remarkable as they include fullerene [26], silica [27] and 4,4´-bipyridine [28][29]. During the last years, our research has been focused on the preparation of coordination polymers with increasing dimensionality with a variety of metal-ligand combinations, and we have prepared several high dimensional structures with 4,4´-bipyridine, including interpenetrated networks [30][31][32][33][34][35]. In this sense, it is worth mentioning that, when combining an O-donor ligand like TCPP, with a N-donor one, like 4,4´-bipyridine, the Pearson acidity is one of the leading forces to be considered in the extension of the structure, as it is in relationship with the affinity of the metal centre, which is influenced by its oxidation state.…”

Structures of an infinite helical water chain and discrete lattice water in metal–organic framework structures

“…A commonly used strategy in building such extended network structures is to employ appropriate bridging ligands. The bis(2-pyridyl)ketone and its hydrolyzed derivative[(Py) 2 C(OH) 2 ], namely, the gem-diol have been widely used as chelating or chelating-bridging ligands to exhibit a variety of coordination modes [15][16][17]. Moreover, many novel water clusters in MOFs have been found in Ni(II) and Co(II)complexes [18][19][20].…”

Intrachain antiferromagnetic exchange in a 1D branched-chain built of two different copper(ii) centres interlinked by end-on azido and phenoxo bridges: electron density map, electrochemical and magnetic properties

“…[1][2][3] The azido ion can link two or more metal ions in the μ-1,1 (end-on, EO), μ-1,3 (end-to-end, EE), or a combination of both modes, yielding various polynuclear and one-(1D), two-(2D), or three-dimensional (3D) species of different topologies, depending on the metal ion and the coligand used. [3][4][5][6] The magnetic exchange mediated via an azido bridge can be ferro-(F) or antiferromagnetic (AF), depending on the bridging mode and bonding parameters. It has been widely stated that the exchange is generally ferromagnetic in nature for the EO mode, and antiferromagnetic for the EE mode, [3][4][5][6][7][8][9] although an increasing number of exceptions have been reported recently.…”

“…[3][4][5][6] The magnetic exchange mediated via an azido bridge can be ferro-(F) or antiferromagnetic (AF), depending on the bridging mode and bonding parameters. It has been widely stated that the exchange is generally ferromagnetic in nature for the EO mode, and antiferromagnetic for the EE mode, [3][4][5][6][7][8][9] although an increasing number of exceptions have been reported recently. [10][11] For copper(II) systems, the magnetic exchange coupling strongly depends on the coordination geometries of the metal ion and the coordination mode of the azido bridge.…”