Magnetostructural characterisation of two M–NCO–bpa polymers (M = Co, Mn and bpa = 1,2-bis(4-pyridyl)ethane)

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.…”

Weak Ferromagnetism Caused by a 2D Effect in Two New Cobalt(II)– and Nickel(II)–1,2‐Bis(4‐pyridyl)ethane (bpa) Polynuclear Compounds

“…On the contrary, for the second polymorphous compound [4,9b] each octahedral sphere is connected to another two through double N,NЈ-bpa bridges. This latter structural unit is common for the rest of M(1):bpa(2) compounds reported so far [4,5] (including compounds 1 and 2). In fact, there are even more similarities among these structures since not only the resulting chains but also their packing on the xy planes are nearly identical for these compounds.…”

“…Similar low values of the torsion angles have been found for other M-(gauchebpa) 2 -M chains. [4,5,9] With regard to the skew propeller configurations of the four coordinated pyridine moieties around the metal ion, the dihedral angle between the two independent pyridine moieties is 74.1(2)°and 72.6(3)°for compounds 1 and 2, respectively. Table 1 summarises the most significant bond parameters for 1 and 2.…”

“…It is worth mentioning that few examples of M-L-bpa [L = NCS [6] and N(CN) 2 [3,7] ] can be found in the literature. For L = N 3 and NCO the [M(N 3 ) 2 (bpa)] (M = Mn, Fe, Co and Ni) [2,8] and [M(NCO) 2 (bpa) 2 ]·bpa (M = Mn and Co) [5] compounds have been characterised to date.…”

“…As a result, bpa is characterised by a high capability to be incorporated into the structural framework, as illustrated by the increasing amount of bpa polymers reported during the last years. [1] Our previous works with bpa concern four families of polymers where this ligand is combined with pseudohalides {azido (N 3 ), [2] dicyanamido [N(CN) 2 ], [3] thiocyanato (NCS) [4] and cyanato (NCO) [5] }. The use of these ligands focuses on the generation of significant magnetic interactions through hydrogen bonds to give a global 2D network.…”