Formation of A2B2 supramolecular porphyrin co-polymers

Abstract

New supramolecular A2B2 co-polymers formed in solution from a rigid diporphyrin monomer (the A2 unit) and a short flexible dipyridine monomer (the B2 unit) are reported; NMR experiments show that complete binding occurs at mM concentrations; UV titrations reveal that the dipyridine unit and a monomeric control ligand have identical binding constants, confirming that linear polymers were generated (in preference to small cyclic oligomers); at 2 x 10(-2) M polymers with an average molecular weight of 17,100 g mol-1 and containing approximately 14 porphyrin units have formed.

Syn–anti conformational switching: Synthesis and X-ray structures of tweezer and anti form in a zinc porphyrin dimer induced by axial ligands

“…A supramolecular tweezer arising from the insertion of a guest molecule between two binding sites of a molecular host that leads to a fascinating spatial architecture resembles a pincer holding an object. Although bis-porphyrin derivatives are well suited to serve as host compounds for the tweezers [18,19,[24][25][26][27][28][29][30], only a few complexes have been structurally characterized so far [18,19,27].…”

Electrochemical and Spectroscopic Characterization of Aluminium(III)-para-methyl-meso-tetraphenylporphyrin Complexes Containing Substituted Salicylates as Axial Ligands

“…Metalloporphyrins and their complexes with various ligands, which play an important role in biological processes and exhibit catalytic properties, are continuing to remain the subject of systematic experimental and theoretical studies [3,4]. The axial ligation on the metal center is a synthetic way to synthesize large multiporphyrinic systems [5][6][7][8][9][10]. Actually much attention has been paid to porphyrin containing zinc(II), magnesium(II), tin(IV), and rhodium(III) as metal centers [11,12].…”

62 Porphyrin-Based Tectons in Molecular Tectonics

“…For these reasons, in the presence of bridging ligand the majority of reported cases concerns oligomeric species. 110 However, a polymeric architecture was described for a mixture of ZnTPP and 2,3-butanedione dihydrazone ligand (Figure 45). 59 Due to the orientation of the lone pairs of the with Zn-N distance of 2.69 Å leads to the final 3D topology with an interlayer distance of ca.…”