Comparative study on removal efficiency of impregnated carbons for hydrogen cyanide vapors in air depending on their phase composition and porous textures.

Activated carbons impregnated with Cu and Zn have been prepared. They are characterized and investigated with respect to their efficiency in the removal of HCN vapors in air. The effect of negligible amounts of Cr and pyridine present in the Cu-Zn impregnants has also been tested. The removal efficiency against HCN vapors in air of the samples obtained is proved to be comparable with that of standard ASC Whetlerite carbon. Carbons impregnated with Cu and Zn and containing additional components in their active phases appear to be advantageous as an alternative of the ASC Whetlerite carbons.

Complexation of the antihypertensive drug oxprenolol with copper(II).

The complexation between copper(II) and the antihypertensive drug oxprenolol (HOxp) was studied both in methanol and slightly alkaline aqueous media at Cu:HOxp molar ratio from 1:1 to 1:10. Copper(lI) forms two types of complexes-a mononuclear violet one, CuOxp2, with bidentately bound ligands and a green dimeric one, Cu2Oxp2Cl2, in which the two Cu(II) centres are linked by the ligand through oxygen bridges. The crystal structure of the Cu2Oxp2Cl2 complex consists of two crystallographically non-equivalent centrosymmetric copper dimers. Each copper atom is four-coordinated in a distorted square-planar environment. The Cu2O2 structural core is characterized by a Cu1-O1-Cu1' angle of 104.15(13)degrees (Cu2-O2-Cu2' 104.30(13) degrees) and a relatively short Cu1-Cu1' separation of 3.026(1) A (Cu2-Cu2'-3.023(1) A). Magnetic susceptibility and EPR measurements indicate an antiferromagnetic coupling of the copper(II) centers.