TIMPZ: An Exquisite Building Block for Metal/Hydrogen Coordination Polymers

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Author(s):	Ligiero, Carolina B. P. ; Oliveira, Thiago V. ; Fontes, Charbel C. F. ; Barragan, Jose T. C. ; So, Fernanda W. Y. ; Kubota, Lauro T. ; Nome, Rene A. ; Miranda, Paulo C. M. L. Total Authors: 8
Document type:	Journal article
Source:	European Journal of Inorganic Chemistry; v. N/A, n. 17, p. 4-pg., 2019-05-08.
Abstract
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. (AU)

FAPESP's process:	14/25770-6 - New frontiers in cross-coupling reactions promoted by palladium: combining enantioselective catalysis, C-H activations, new materials and in flux reactions aiming at high efficiency and sustainability in synthetic processes
Grantee:	Carlos Roque Duarte Correia
Support Opportunities:	Research Projects - Thematic Grants