Scorpionate complexes of aza-18-crown-6 containing fluoronitrophenyl substituents as studied by electrospray ionization mass spectrometry

Abstract

This indicates that a metal cation complexed by crown ether ring is additionally coordinated by a nitro group in the scorpionate mode. To the best of our knowledge, our finding provide the first example of a complex in which a metal cation complexed by a crown ether ring is additionally coordinated by a nitro group.

Recent advances in mass spectrometry studies of non-covalent complexes of macrocycles - A review

“…In this area of research, Frański et al [104,105] studied the formation of organometallic complexes between fluorosustitued N-nitrophenylaza-18C6 conjugates with metals influenced by the presence of a nitro group at the ortho or para position. In a first work, ESI-CID-MS/MS experiments demonstrated that the fluorosubstituted N-nitrophenylaza-18C6 with the nitro group at ortho position coordinated the alkaline cations by a crown ether ring and the nitro group in the scorpionate mode [104]. On the other hand, for complexes with metal as lead, the species [M-H+Pb] + were observed for conjugates containing hydrogen atom at the ortho position to the crown moiety [104,105].…”

“…In a first work, ESI-CID-MS/MS experiments demonstrated that the fluorosubstituted N-nitrophenylaza-18C6 with the nitro group at ortho position coordinated the alkaline cations by a crown ether ring and the nitro group in the scorpionate mode [104]. On the other hand, for complexes with metal as lead, the species [M-H+Pb] + were observed for conjugates containing hydrogen atom at the ortho position to the crown moiety [104,105]. In this case, the nitro group affects the formation of [M-H+Pb] + , however, the metallic cation was also complexed by crown ether conjugates aza-18C6 moiety as a scorpionate.…”