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Verfasst von:Vitske, Viktoriia [VerfasserIn]   i
 König, Carolin [VerfasserIn]   i
 Hübner, Olaf [VerfasserIn]   i
 Kaifer, Elisabeth [VerfasserIn]   i
 Himmel, Hans-Jörg [VerfasserIn]   i
Titel:Syntheses of the first coordination compounds of the new strong molecular electron donor and double proton sponge 1,4,5,8-tetrakis(tetramethylguanidino)naphthalene
Verf.angabe:Viktoriia Vitske, Carolin König, Olaf Hübner, Elisabeth Kaifer, and Hans-Jörg Himmel
Jahr:2010
Umfang:12 S.
Fussnoten:Online veröffentlicht am 20. November 2009 ; Gesehen am 07.09.2023
Titel Quelle:Enthalten in: European journal of inorganic chemistry
Ort Quelle:Weinheim : Wiley-VCH, 1998
Jahr Quelle:2010
Band/Heft Quelle:(2010), 1 vom: Jan., Seite 115-126
ISSN Quelle:1099-0682
Abstract:Herein we report on the synthesis and properties of a new electron donor featuring an aromatic system to which four guanidino groups are attached, namely, 1,4,5,8-tetrakis(tetramethylguanidino)naphthalene (ttmgn). The molecule is a double proton sponge with an asymmetric N-H···N bridge being formed in the protonated form. Oxidation is followed electrochemically, and two oxidation waves at E1/2(CH3CN) = -0.25 and +0.50 V vs. SCE are observed. Chemical oxidation with I2 yields ttmgn(I3)2, in which the I3- units interact with the ttmgn2+ cations through I···C contacts. Reaction with an excess amount of Br2 leads to removal of four electrons from the aromatic system and formation of the salt (ttmgn)Br4 with a chair-type conformation of the C10 core. The binuclear Al alkyl complex [(ttmgn)(AlMe2)2][BPh4]2 can be prepared by reaction between the diprotonated ttmgn molecule and AlMe3 and serves as a benchmark system for the understanding of dynamic effects. Magnetic superexchange through the ligand unit is studied for the binuclear CoII complex [(ttmgn)(CoCl2)2]. SQUID measurements show an extremely weak antiferromagnetic coupling. The coupling might be affected by the unusual geometry of the coordination compounds of ttmgn, in which the metal ions are significantly displaced from the plane defined by the aromatic ring of the ttmgn ligand. We also report the analogous Co complex of ttmgb [ttmgb = 1,2,4,5-tetrakis(tetramethylguanidino)benzene], namely, [(ttmgb)(CoCl2)2], in which the bonding situation is quite different.
DOI:doi:10.1002/ejic.200900724
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1002/ejic.200900724
 Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/ejic.200900724
 DOI: https://doi.org/10.1002/ejic.200900724
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:Aluminum
 Cobalt
 Electron donor ligands
 N ligands
K10plus-PPN:1859069398
Verknüpfungen:→ Zeitschrift

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