5- and 6-pulse electron spin echo envelope modulation (ESEEM) of multi-nuclear spin systems

Probing Hydrogen Bonding to Bound Dioxygen in Synthetic Models for Heme Proteins: The Importance of Precise Geometry

“…173.0, 172.7, 159.4, 157.4, 151.5, 150.1, 149.3, 149.2, 148.1, 147.9, 136.8, 135.8, 131.1, 130.8, 130.3, 130.1, 129.5, 129.2, 128.3, 125.5, 124.0, 122.1, 120.0, 118.6, 116.0, 114.0, 111.2, 109.7, 105.8, 105.4, 104.9, 93.7, 77.3, 67.9, 67.5, 66.8, 60.1, 59.5, 46.8, 30.9, 29.7, 29.5, 29.0, 26.3, 25.5, 23.4, 14.2, 13.6 Zn (1427.98): C 68.13, H 5.86, N 6.87;found: C 68.13, H 5.97, N 6.58. (Tetraethyl 4,4',4'',4'''-{[10-(2-(1H-imidazol-5-ylethynyl)-5-{[6-(1H-[1,3-15 N 2 ]imidazol-1-yl)hexyl]oxy}phenyl)porphyrin-5,15-diyl-kN 21 ,kN 22 , kN = 173.0, 172.7, 159.3, 157.4, 150.1, 149.3, 149.2, 148.1, 147.9, 136.9, 131.1, 130.8, 130.7, 130.3, 130.1, 129.5, 129.2, 123.9, 122.1, 120.0, 118.6, 115.9, 114.0, 111.2, 109.7, 105.8, 105.4, 104.9, 93.7, 77.3, 67.9, 67.5, 66.8, 60.1, 59.5, 46.8, 46.7, 31.9, 30.9, 29.7, 29.6, 29.5, 29.3, 29.1, 29.0, 26.3, 25.5, 24.0, 23.4, 22.7, 14.2, 13. …”

“…In order to determine whether the hyperfine matrix of the exchangeable proton has both, positive and negative principal values, the X-band 6-pulse HYSCORE [21] spectrum of 7-Co-(DiMeIm)(O 2 ) was measured close to g x . Although the 6-pulse HYSCORE spectrum did not allow for measuring the full exchangeable splitting, its off antidiagonal ridge is clearly visible (Figure 6).…”

“…24,H 5.78,N 7.84;found: C 67.41,H 5.95,N 7.70. (Tetraethyl 4,4',4'',[4][5][6][7][8][9][10]-5-{ [6-(1H-imidazol-1-yl)hexyl]oxy}phenyl)porphyrin-5,15-diyl-kN 21 ,kN 22 ,kN 23 ,kN 24 ]bis[benzene-2,1,3-triylbisA C H T U N G T R E N N U N G (oxy)]}tetrabutanoato(2À))zinc (4-Zn): The title compound was prepared from 18-Zn (50 mg, 0.04 mmol) according to the general procedure using iodinated precursor 21. Yield 40 mg (74 %); m.p.…”

“…Yield 40 mg (74 %); m.p. 102-104 8C; (Tetraethyl 4,4',4'',(4)(5)(6)(7)(8)(9)(10)hexyl]oxy}phenyl)porphyrin-5,15-diyl-kN 21 ,kN 22 ,kN 23 ,…”

Cryogenic 35GHz pulse ENDOR probehead accommodating large sample sizes: Performance and applications

“…Due to the cross-suppression effect, which hampers the determination of shallow modulation, the proton hyperfine couplings initially could not be detected at X-band [11,33,34]. Q-band Davies ENDOR experiments later allowed for the detection of the complete proton signals revealing the hyperfine couplings.…”