Tin(IV)-Porphyrin Tetracarbonyl Cobaltate: An Efficient Catalyst for the Carbonylation of Epoxides

Cationic tin(IV) porphyrins with tetracarbonyl cobaltates were synthesized, exhibiting bifunctional catalytic reactivity. The Lewis acidic tin-porphyrin center activated epoxides; concurrently, cobalt carbonyl anions efficiently opened epoxides and delivered carbonyl moieties. Thus, a series of β-lactones with a high synthetic value were obtained. This catalytic system showed excellent efficiency exceeding a turnover number of one thousand with a broad substrate scope. In addition, the presented tin porphyrin-based catalyst exhibited exclusive chemoselectivity to terminal epoxides over internal ones. The selective carbonylation of di-epoxides demonstrated the usefulness of these catalysts in the synthesis of complex molecular structures.

Formation of a long-lived radical pair in a Sn(iv) porphyrin–di(l-tyrosinato) conjugate driven by proton-coupled electron-transfer

A surprisingly long-lived radical pair state is achieved in a tin-porphyrin/l-tyrosine conjugate by exploiting a photochemical PCET quenching mechanism.

Synthesis of novel single site tin porphyrin complexes and the catalytic activity of tin tetrakis(4-fluorophenyl)porphyrin over 𝜀-caprolactone

Tin tetrakis(4-fluorophenyl)porphyrin, tin tetrakis(4-chlorophenyl)porphyrin and tin tetrakis(4-bromophenyl)porphyrin complexes were prepared by reaction of butyltin trichloride with tetrakis(4-fluorophenyl)porphyrin, tetrakis(4-chlorophenyl)porphyrin, and tetrakis(4-bromophenyl)porphyrin in tetrahydrofuran and toluene, respectively. These novel complexes were characterized by [Formula: see text]H, [Formula: see text]C NMR, FTIR, mass spectroscopy and elemental analysis. The single site tin complex including fluoride was tested as a catalyst in polymerization of [Formula: see text]-caprolactone and was very effective. Polycaprolactone was characterized by [Formula: see text]H, [Formula: see text]C NMR, and gel permeation chromatography.

Functionalization of reduced graphene oxide with axially-coordinated metal-porphyrins: facile syntheses and temporally-dependent nonlinear optical properties

Reduced graphene oxide-tin porphyrin nanohybrids with good dispersibility have been prepared, which exhibited large optical nonlinearity due to a combination of mechanisms.