The 5 9 ~ o NMR and magnetization measurement in (Lal-,Y,) Co5Hy have been performed at 77 K. The magnetizations of these compounds decrease with increasing hydrogen content (y) and are indepedent of Y-concentration (2). This result can be interpreted by an electron transfer effect in the direction H atom -+ Co atom. The pseudobinary intermetallic compound (Lal-,Y,) C05 have CaCu5 type structur...

In this study, we observed unprecedented cleavages of the C(β)-C(γ) bonds of tryptophan residue side chains in a series of hydrogen-deficient tryptophan-containing peptide radical cations (M(•+)) during low-energy collision-induced dissociation (CID). We used CID experiments and theoretical density functional theory (DFT) calculations to study the mechanism of this bond cleavage, which forms [M...

Chelidamic acid (4-hy-droxy-pyridine-2,6-dicarb-oxy-lic acid) and 2,6-diamino-pyridine react to form the title salt, C(5)H(8)N(3) (+)·C(7)H(4)NO(5) (-); there are two formula units in the asymmetric unit. The pyridine N atom of 2,6-diamino-pyridine is protonated whereas chelidamic acid is deprotonated at both carboxyl-ate groups but protonated at the N atom; the reaction involves intra- and int...