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3‐(4‐Pyridyl)‐acetylacetone – a fully featured substituted pyridine and a flexible linker for complex materials
Author(s) -
Merkens Carina,
Truong KhaiNghi,
Englert Ulli
Publication year - 2014
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520614006210
Subject(s) - acetylacetone , pyridine , linker , chemistry , materials science , polymer chemistry , computer science , organic chemistry , programming language
3‐(4‐Pyridyl)‐acetylacetone (HacacPy) acts as a pyridine‐type ligand towards Cd X 2 ( X = Cl, Br, I). Chain polymers with six‐coordinated metal cations are obtained from CdCl 2 and with alternating five‐ and six‐coordinated Cd centers from CdBr 2 . In either case, the formation of these compounds does not depend on the precise stoichiometry. In contrast, two different reaction products form with the heavier congener CdI 2 , namely a ligand‐rich molecular complex CdI 2 (HacacPy) 2 and a ligand‐deficient one‐dimensional polymer [CdI 2 (HacacPy)] 1 ∞ . Interconversion between these two iodo derivatives is possible via thermal degradation and mechanochemical synthesis. The acetylacetone moiety in HacacPy may be deprotonated and chelated to Fe III , and the resulting complex Fe(acacPy) 3 reacts analogously to a bridging polypyridine ligand towards the same Cd halides as the molecule HacacPy itself. With CdCl 2 and CdBr 2 , isomorphous chain polymers are obtained in which the Cd cations adopt distorted octahedral coordination and one of the peripheric pyridyl groups remains uncoordinated. With CdI 2 , the iron complex acts as a ‐Fe(acacPy) 3 bridge between tetrahedral Cd centers and gives rise to a ladder structure.