93565-35-6Relevant academic research and scientific papers
EPR and ENDOR of Sodium Complexes of Spin Labeled Monoazacrown Ethers
Sosnovsky, George,Lukszo, Jan,Gutierrez, Peter L.,Scheffler, Klaus
, p. 376 - 380 (2007/10/02)
Sodium complexes 3 and 5 of the spin labeled monoazacrown ethers 2,2,15,15-tetramethyl-1-aza-4,7,10,13-tetraoxacyclopentadecane-1-oxyl (2) and 1,4,7,10-tetraoxa-13-(2',2',6',6'-tetramethylpiperidine-1'-oxyl-4'-yl)azacyclopentadecane (4) were synthesized and studied by EPR and ENDOR spectroscopies.The hyperfine splitting parameter and the g value of the complex 5, containing the exocyclic nitroxyl moiety, were identical to the parent complexon 4, i.e., aN = 15.6 G, g = 2.0060 +/- 0.0001.In contrast, the data for the complex 3, containing the endocyclic nitroxyl moiety were different.Thus, the spectrum of the complex 3 was a triplet of quartets with aN = 15.7 G, aNa = 2.47 G, g = 2.0062 +/- 0.0001, whereas the spectrum of the parent complexon 2 was a triplet with aN = 15.5 G, g = 2.0059 +/- 0.0001.The interaction between the sodium cation and the nitroxyl moiety in 3 was further confirmed by the sodium ENDOR transition at 7.27 MHz. - Keywords: Azacrown Ethers, Nitroxyl Radicals, Synthesis, EPR, ENDOR
Novel Spin Labeled Azacrown Ethers
Sosnovsky, George,Lukszo, Jan
, p. 1586 - 1588 (2007/10/02)
Four novel spin labeled azacrown ethers containing either endo- or exo-cyclic nitroxyl moieties were synthesized by short and convenient routes.These compounds should be of interest in biological studies of membranes using ESR spectroscopy. - Keywords: Azacrown Ethers, ESR Spectra, Synthesis, Nitroxyl Radical
