The novel ligand 4′-phenyl-3,2′:6′,3′′-terpyridine (L) and the supramolecular structure of the dinuclear complex [Zn2(μ-L)(acac)4]·H2O (acac=acetylacetonato)

Cobalt(ii) coordination polymers with 4′-substituted 4,2′:6′,4′′- and 3,2′:6′,3′′-terpyridines: engineering a switch from planar to undulating chains and sheets

“…Granifo and coworkers have reported that 4'-phenyl-3,2':6',3"- the water molecule is hydrogen-bonded between the two {Zn(AcO-O,O') 2 } domains. 19 To the best of our knowledge, only three coordination polymers based on 3,2':6',3"-tpy 70 metal-binding domains have been structurally characterized 20,21 and all contain 4'-(4-pyridyl)-3,2':6',3"-tpy in which the central N-donor of the tpy unit remains uncoordinated. 22 pyridine domain will not occur.…”

“…2b. The phenyl ring of ligand 1 is twisted 15.45 (19) o out of the plane of the pyridine (py) 35 ring to which it is attached. Despite the non-planarity of the phenylpyridine unit, centrosymmetric pairs of phenylpyridine domains in adjacent sheets engage in face-to-face π- Figure 4 illustrates two such stacking interactions between parts of three adjacent sheets.…”

The relevance of the fluorine interactions in the supramolecular structure of a complex constructed from copper(II) hexafluoroacetylacetonate and the 4′-(3-pyridyl)-2,2′:6′,2″-terpyridine ligand. Novel C–F/π synthons involving the π-system of the terpyridine moieties and those of the hexafluoroacetylacetonate chelate rings

“…The similarity of these geometric parameters with those characterizing the above cation-cation interactions ( Table 2) and a low electron density on each p-ring centre, due to the presence of two electronegative oxygen atoms together with the inductive effect of the CF 3 groups, suggests that this is a new type of interaction between fluorine atoms and chelate rings with delocalized p-bonds, which to the best of our knowledge has not been informed previously. In the same line of thought, only recently an equivalent approach has been proposed in complexes containing the related chelating acac ligand, in order to evaluate non-covalent interactions of the C-H/p type between H atoms and p-rings of chelating acac ligands [23,24]. But, it must be taken into account the important difference that occurs when the acac ligand is replaced by the hfacac ligand;…”

Manipulating the Conformation of 3,2′:6′,3″-Terpyridine in [Cu2(μ-OAc)4(3,2′:6′,3″-tpy)]n 1D-Polymers

“…In these structures, the 3,2 :6 ,3 -tpy domain adopts either conformation I or II (Scheme 2). Although conformation III is suited to the formation of discrete molecular architectures [16][17][18][19][20], it also appears in several infinite assemblies [21][22][23][24]. In one 3D-assembly, the 3,2 :6 ,3 -tpy domain is locked into conformation III by virtue of a bridging cyano ligand between the coordinated metal centres of a single 3,2 :6 ,3 -tpy unit, and propagation of the coordination network into 3-dimensions relies on the presence of a 4 -pyridin-4-yl substituent [25].…”