196300-93-3Relevant academic research and scientific papers
Regioselective complexation of new multiple piperazine/pyridine ligands: differentiation by113Cd-NMR spectroscopy
Ratilaincn, Jari,Airola, Karri,Kolehmaincn, Erkki,Rissanen, Kari
, p. 1353 - 1359 (2007/10/03)
Eleven novel piperazine containing open-chain ligands L1-L11 were designed to offer symmetrical and asymmetrical complexation sites for metal ions and were synthesized by repetitive synthetic method. The divergent use of aromatic bishalomethyl and mono-Af-alkylated piperazine compounds as spacers led to a series of long (up to M. W. = 836) oligomeric multidentate N-ligands. Due to the lack of solid state methods for structure analysis, an NMR technique using 113Cd nucleus as a probe in solution state was utilised. 113Cd chemical shifts were observed to be dependend on the coordination site and similar coordination sites in different ligands gave characteristically similar 113Cd chemical shifts. As a result 113Cd-NMR spectroscopy proved to be an excellent tool to distinguish between the structures of the different complexation sites on a nearly quantitative level. VCH Verlagsgesellschaft mbH,.
