| |
| We have designed a new porphyrin, H2HATPP (5-(N-(2-hydroxybenzyl)-aminophenyl)- 10,15,20-triphenylporphyrin), to study the influence of the structural change on hydrogen bonding interactions. The corresponding complex [Zn(HATPP)] has been synthesized, and characterized by X-ray crystallography, 1H NMR etc. The complex crystallizes in the triclinic system, space group P-1, lattice parameters: a＝12.163(2) Å, b＝13.402(3) Å, c＝15.794(2) Å,α = 66.27(3) , β＝74.24(3) , γ = 78.86 , V＝2258.0(8) Å3, Z＝2, μ＝0.584 mm-1, F(000)＝828, Dc＝1.175 gocm-3, R1＝0.0714 and wR2＝0.1906. The structure shows the phenol oxygen is involved in double hydrogen bonds: one is within N-(2-hydroxybenzyl)aminophenyl group, the other is between phenol oxygen and N atom of another symmetry related molecule. The nitrogen in the N-(2-hydroxybenzyl)aminophenyl group is sp3 hybridized. Comparing with [Zn(SATPP)] species (H2SATPP, 5-(salicylideneaminophenyl)-10,15,20- triphenylporphyrin), the phenol oxygen in [Zn(HATPP)] is away from the porphyrin center, too far from zinc to form an intramolecular hydrogen bond with an axial ligand. Such structural change also cause the binding affinity of [Zn(HATPP)] to methanol to be much smaller than that of SATPP species. |
|
| Keywords:porphyrin; hydrogen bond; hydroxybenzyl; binding constant |
|
