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X‐Ray Photoelectron Spectroscopy of Porphycenes: Charge Asymmetry Across Low‐Barrier Hydrogen Bonds
Author(s) -
Ghosh Abhik,
Moulder John,
Bröring Martin,
Vogel Emanuel
Publication year - 2001
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20010119)40:2<431::aid-anie431>3.0.co;2-a
Subject(s) - x ray photoelectron spectroscopy , chemistry , hydrogen bond , hydrogen , asymmetry , spectroscopy , hydrogen atom , crystallography , molecule , nuclear magnetic resonance , group (periodic table) , physics , organic chemistry , quantum mechanics
It is ironic that although it is typically a technique that “sees” all elements other than hydrogen atoms, X‐ray photoelectron spectroscopy (XPS) acts as a sensitive probe of low‐barrier hydrogen bonds, as seen in a study of free‐base tetrapyrroles. The nitrogen 1s XPS peaks never quite coalesce, even when the N⋅⋅⋅H⋅⋅⋅N hydrogen bonds are almost perfectly symmetrical, as is the case for dibenzo[ cde , mno ]porphycenes (see picture).