The newly synthesized bis(thiocyanato)-triphenylcorrole has turned out to be a good corrole based precursor for the facile synthesis of thiol protected gold nanoparticles (Au NPs).
A new methodology
for porphyrin synthesis has been developed. This
is a simple two-step protocol. The first step involves the condensation
of pyrrole and aldehyde in an H2O–MeOH mixture using
HCl. The obtained precipitate from the first step was dissolved in
reagent-grade dimethylformamide (DMF) and refluxed for 1.5 h, followed
by stirring overnight in the air at room temperature. Subsequent purification
through column chromatography or crystallization resulted in the formation
of pure porphyrins. Advantageously, this methodology does not need
any expensive chemicals such as 2,3-dichloro-5,6-dicyanobenzoquinone
(DDQ), chloranil, and so forth as an oxidizing agent. This reaction
also does not require a large volume of dry chlorinated solvents.
Contrary to the reported methodologies, which are mostly ineffective
in the gram-scale production of porphyrins, the present method perfectly
caters to the need for gram-scale production of porphyrins. In essence,
the current methodology does not represent the synthesis having the
highest yield in the literature. However, it represents the easiest
and cheapest synthesis of porphyrin on a large scale to obtain a reproducible
yield of 10–40% with high purity. In a few of the examples,
even column chromatography is not necessary. A simple crystallization
technique will be sufficient to generate the desired porphyrins in
good yields.
A new platinum(II) porphyrin complex has been synthesized and characterized via various spectroscopic techniques. Singlecrystal XRD analysis reveals that the geometry around the Pt(II) center is near the perfect square planar geometry. The Pt(II)À N bond distances are in the ranges of 2.005 Å-2.020 Å. The platinum(II) porphyrin derivative exhibited one reversible oxidative couple at + 1.10 V and a reversible reductive couple at À 1.47 V versus Ag/AgCl. In deaerated dichloromethane solution at 298 K, a strong phosphorescence is observed at 660 nm, with emission quantum yield of 35 % and lifetime of 75 μs. Upon excitation of the acenaphthene chromophores at 300 nm, sensitised phosphorescence of the Pt(II) porphyrin is observed with a unitary efficient energy transfer, demonstrating that this system behaves as a light harvesting antenna. The red phosphorescence is strongly quenched by oxygen, resulting in singlet oxygen production with a very high quantum yield of 88 %. This result indicates that this Pt(II) porphyrin is an excellent photosensitizer for the production of singlet oxygen and will have potential applications in the field of photodynamic therapy as well as oxygen sensors.
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