Redox-active unsaturated chelate ligands can be realised with different ring sizes of the resulting metallacycles. An overview is presented, starting from an exposition of non-innocent behaviour and chelate effects. A systematic approach is used to describe the most familiar situation, the metal complexes of 1,4-hetero-1,3-dienes in established forms (e.g. o-quinone, α-dithiolene, and α-diimine ligands) and with less common combinations of O, S, and N heteroatoms. The different steric and electronic conditions in six-membered chelate ring systems derived from the β-diketonate structure will be discussed with examples of substituted and π extended ligands, including 9-oxidophenalenyl, formazanate, and anions derived from indigo or 9,10-anthraquinone. Four-membered chelate rings existing in at least two ligand-based oxidation states are available through steric and electronic stabilisation in amidinate or triazenide complexes. Three-membered and seven-membered chelate ring situations are discussed briefly as further alternatives.
%0 Journal Article
%1 kaim2019chelate
%A Kaim, Wolfgang
%D 2019
%I The Royal Society of Chemistry
%J Dalton Transactions
%K sent ubs_10003 ubs_20003 ubs_30030 ubs_40048 unibibliografie
%N 24
%P 8521-8529
%R 10.1039/C9DT01411J
%T Chelate rings of different sizes with non-innocent ligands
%V 48
%X Redox-active unsaturated chelate ligands can be realised with different ring sizes of the resulting metallacycles. An overview is presented, starting from an exposition of non-innocent behaviour and chelate effects. A systematic approach is used to describe the most familiar situation, the metal complexes of 1,4-hetero-1,3-dienes in established forms (e.g. o-quinone, α-dithiolene, and α-diimine ligands) and with less common combinations of O, S, and N heteroatoms. The different steric and electronic conditions in six-membered chelate ring systems derived from the β-diketonate structure will be discussed with examples of substituted and π extended ligands, including 9-oxidophenalenyl, formazanate, and anions derived from indigo or 9,10-anthraquinone. Four-membered chelate rings existing in at least two ligand-based oxidation states are available through steric and electronic stabilisation in amidinate or triazenide complexes. Three-membered and seven-membered chelate ring situations are discussed briefly as further alternatives.
@article{kaim2019chelate,
abstract = {Redox-active unsaturated chelate ligands can be realised with different ring sizes of the resulting metallacycles. An overview is presented, starting from an exposition of non-innocent behaviour and chelate effects. A systematic approach is used to describe the most familiar situation, the metal complexes of 1,4-hetero-1,3-dienes in established forms (e.g. o-quinone, α-dithiolene, and α-diimine ligands) and with less common combinations of O, S, and N heteroatoms. The different steric and electronic conditions in six-membered chelate ring systems derived from the β-diketonate structure will be discussed with examples of substituted and π extended ligands, including 9-oxidophenalenyl, formazanate, and anions derived from indigo or 9,10-anthraquinone. Four-membered chelate rings existing in at least two ligand-based oxidation states are available through steric and electronic stabilisation in amidinate or triazenide complexes. Three-membered and seven-membered chelate ring situations are discussed briefly as further alternatives.},
added-at = {2019-12-05T12:13:36.000+0100},
author = {Kaim, Wolfgang},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2bae5377d494f3679edf0a77f7f87100c/unibiblio},
doi = {10.1039/C9DT01411J},
interhash = {ad93140e89ccec5724f80b2e31bc586a},
intrahash = {bae5377d494f3679edf0a77f7f87100c},
issn = {1477-9234},
journal = {Dalton Transactions},
keywords = {sent ubs_10003 ubs_20003 ubs_30030 ubs_40048 unibibliografie},
language = {eng},
number = 24,
pages = {8521-8529},
publisher = {The Royal Society of Chemistry},
timestamp = {2019-12-05T11:13:36.000+0100},
title = {Chelate rings of different sizes with non-innocent ligands},
volume = 48,
year = 2019
}