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TIMPZ: An Exquisite Building Block for Metal/Hydrogen Coordination Polymers
Author(s) -
Ligiéro Carolina B. P.,
Oliveira Thiago V.,
Fontes Chárbel C. F.,
Barragan José T. C.,
So Fernanda W. Y.,
Kubota Lauro T.,
Nome René A.,
Miranda Paulo C. M. L.
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201900229
Subject(s) - bathochromic shift , chemistry , intramolecular force , hydrogen bond , supramolecular chemistry , ligand (biochemistry) , photochemistry , chelation , metal , coordination complex , supramolecular polymers , crystallography , fluorescence , inorganic chemistry , stereochemistry , crystal structure , molecule , organic chemistry , biochemistry , physics , receptor , quantum mechanics
The novel polynitrogenated ligand tetra‐[4(5)‐imidazoyl]pyrazine (TIMPZ, 1 ) and its pincer complex of Fe II are described. This ligand has an outstanding ability to aggregate in 1D‐superstructures by means of hydrogen bonding or metal chelation. TIMPZ shows an unprecedented conformational control over the supramolecular assembly. Metal or hydrogen coordination switches the conformation of peripheral rings driving the assembly preferences. For [Fe n (TIMPZ) n +1 ] 2n+ complexes, UV/Vis spectroscopy shows a bathochromic shift of the main visible absorption band with higher “ n ” values. TIMPZ also has hydrogen‐bond triggered excited‐state intramolecular proton transfer (ESIPT) fluorescence, which is completely inhibited by chelation with transition metals.