Showing papers by "Piotr Kuś published in 2004"

Mono- meso - tert -butylporphyrin

Abstract: Treatment of meso-tetra(tert-butyl)porphyrin with sulfuric acid/n-butanol affords a mixture of porphyrin and mono-tert-butylporphyrin in relatively high yield

N-Cyclo­hexyl-4-(methoxy­carbonyl)­benz­amide

Abstract: The title compound, methyl 4-(cyclo­hexyl­amino­carbonyl)­benzoate, C15H19NO3, crystallizes with two independent mol­ecules in the asymmetric unit, which differ in their ring orientations. The mol­ecules are connected by N—H⋯O=C hydrogen bonds to form chains parallel to the a axis.

TLC and RPTLC Separation of Porphine, Selected Porphyrins, and their Metalloderivatives

Abstract: Strong interest in the chemistry of porphyrins has been generated by their numerous applications in a variety of fields of chemistry, biochemistry, and medicine. A common and well-known natural metalloporphyrin is heme, a complex of porphyrin with Fe 2+ . It is the prosthetic group of hemoglobins, myoglobins, cytochromes b, catalases, and peroxidases. Other common metalloporphyrins are the chlorophylls, responsible for the process of photosynthesis. They are complexes of porphyrins with magnesium (Mg 2+ ). Cobalamin (known as vitamin B 12 ) is a complex of porphyrin with cobalt (Co 3+ ). It participates in the process of blood-formation and might counteract malignant anemia [1]. Metalloporphyrins are present in crude oil and petroleum derivatives, for example resins or asphaltines. Crude oil, especially in its heavy fractions, contains complexes of porphyrins with nickel (Ni 2+ ) or vanadium (VO 2+ ) [2]. Metalloporphyrins are used as catalysts during oxidation of organic compounds [3] and as components of ion-selective electrode membranes or as chemical modifiers of electrode surfaces [4]. Artificial photosynthesis has now become possible by application of synthetic porphyrin compounds [5]. There is also growing medical interest in porphyrins. Derivatives of hematoporphyrins have been used in socalled photodynamic therapy (PDT) for destruction of malignant cells [6]. Porphyrin chemistry is a constantly developing field and syntheses of new compounds belonging to this group continue.

Quinoline-2(1H)-thione, a structure with Z′ = 8

Abstract: The title compound, C9H7NS, crystallizes as the thione tautomer with Z′ = 8 (four independent dimers with local inversion symmetry via two N—H⋯S=C hydrogen-bond systems). The dimers are arranged in chains parallel to [\overline 110], each chain being crystallographically independent. These chains are associated into layers via stacking of ring systems. The Z′ value can be rationalized in terms of a factor 2 for dimer formation without crystallographic symmetry and an additional factor 4 for differing stacking environments.

“Weak” OH···πHydrogen Bonds in the Structures of Two Phenols

Abstract: Crystallographic studies of α, α’-di(4-hydroxyphenyl)-1,4-diisopropylbenzene (1) and α, α’-di- (3,5-dimethyl-4-hydroxyphenyl)-1,4-diisopropylbenzene (2) were performed. Both compounds display the anti conformation. Compound 1 crystallizes as the 1:1 hydrate; the packing involves three classical hydrogen bonds and one non-classical OH···π bond. Both OH groups of 2 form non-classical OH···π hydrogen bonds to aromatic rings.