Self-assembling mixed porphyrin trimers – the use of diaxial Sn(IV)porphyrin phenolates as an organising precept

Binding of Catechols to Iron(III)–Octaethylporphyrin: An Experimental and DFT Investigation

“…Very few structural reports of catecholato‐bound metalloporphyrins exist. Two examples of the η 1 ‐binding mode of catechol have been observed for Sn IV –tetraphenylporphyrins in a six‐coordinate species 12a,12b. Two more examples have been reported where the catechol oxygen atom binds the metal center in both η 1 ‐ and η 2 ‐modes to form seven‐coordinate species, one with Zr IV –tetraphenylporphyrin12c and other with Nb V –tetraphenylporphyrin 12d.…”

“…We sought to determine the nature of the binding of catechols with Fe III –porphyrins as no report on the structure and characterization of such species appears to exist. There are very few structural reports for catecholate‐bound metalloporphyrins; just two examples are known with Sn IV –tetraphenylporphyrins12a,12b and one each with Zr IV –12c and Nb V –tetraphenylporphyrins 12d …”

Synthesis and characterisation of a bis(silyloxy)tin(IV) porphyrin

“…In terms of light absorption, glasses that have been surface-modified to produce thin layers of porphyrinic arrays should also be compatible with the strong light absorption properties of the same porphyrinic materials, i.e., allowing 100% of visible light to be absorbed by the porphyrin chromophore. We have been investigating the condensation of bis(hydroxy)tin(IV) porphyrins with a range of structurally varied phenols and carboxylic acids to produce both discrete multiporphyrin assemblies and supramolecular arrays [5][6][7][8].…”

Porphyrin-based supermolecules and supramolecular arrays

“…Characteristic of complex formation is the large chemical shift changes (Δδ) associated with the protons on the axial ligands (Fig. 3) and are a result of the time-averaged orientation and proximity of these nuclei to the porphyrin ring current [14,36,38]. A number of the phenolates formed to date are shown in Scheme 4.…”

“…[Zn(II)TTP] 2 and Sn(IV)TTP.8 2 in which the porphyrins might adopt more parallel orientations [38]. Heating two equivalents of 8 and Sn(IV)TTP(OH) 2 [39] (60 °C, 3 h) in CHCl 3 solution and chromatography on neutral alumina gave rise to a highly soluble complex (in 95% yield).…”