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Search: authors:"Błażej Gierczyk"

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New Gel-Like Polymers as Selective Weak-Base Anion Exchangers

A group of new anion exchangers, based on polyamine podands and of excellent ion-binding capacity, were synthesized. The materials were obtained in reactions between various poly(ethyleneamines) with glycidyl derivatives of cyclotetrasiloxane. The final polymeric, strongly cross-linked materials form gel-like solids. Their structures and interactions with anions adsorbed were ...

ESI-MS detection of very weak π-Stacking interactions in the mixed-ligand sandwich complexes formed by substituted benzo-crown ethers and metal cations

The stability of the mixed-ligand complex formed by amino-benzo-15-crown-5 and nitro-benzo-15-crown-5, with a metal cation, [NH2B15C5+NO2B15C5+K]+, was found to be enhanced by π-stacking interactions. This conclusion was deduced by comparison of the abundance of the mixed-ligand complex with the abundances of homo-ligand complexes ([(NH2B15C5)2+K]+, [(NO2B15C5)2+K]+), as well as ...

Unusual ion UO4 − formed upon collision induced dissociation of [UO2(NO3)3]−, [UO2(ClO4)3]−, [UO2(CH3COO)3]− ions

The following ions [UO2(NO3)3]−, [UO2(ClO4)3]−, [UO2(CH3COO)3]− were generated from respective salts (UO2(NO3)2, UO2(ClO4)3, UO2(CH3COO)2) by laser desorption/ionization (LDI). Collision induced dissociation of the ions has led, among others, to the formation of UO4 − ion (m/z 302). The undertaken quantum mechanical calculations showed this ion is most likely to possess square ...

Anion-π interactions—interactions between benzo-crown ether metal cation complexes and counter ions

The loss of X· radical from [M + Cu + X]+ ions (copper reduction) has been studied by the so called in-source fragmentation at higher cone voltage (M = crown ether molecule, X− = counter ion, ClO 4 − , NO 3 − , Cl−). The loss of X· has been found to be affected by the presence/lack of aromatic ring poor/rich in electrons. Namely, the loss of X· occurs with lower efficiency for the ...