Chirale Dimethylgalliumaminoalkoxide

Abstract

Multiferroic magnetoelectric composite systems such as ferromagnetic‐ferroelectric heterostructures have recently attracted an ever‐increasing interest and provoked a great number of research activities, driven by profound physics from coupling between ferroelectric and magnetic orders, as well as potential applications in novel multifunctional devices, such as sensors, transducers, memories, and spintronics. In this Review, we try to summarize what remarkable progress in multiferroic magnetoelectric composite systems has been achieved in most recent few years, with emphasis on thin films; and to describe unsolved issues and new device applications which can be controlled both electrically and magnetically.

On the Crystal Engineering of Organogallium Alkoxides Derived from Primary-Amine Alcohols − Relationships between Hydrogen Bonding and Donor−Acceptor Bonds

“…The general structural features of the molecules are consistent with those observed for related gallium alkoxides (average GaϪO equatorial , GaϪO axial and GaϪN distances are 1.923 A ˚, 2.113 A ˚and 2.348 A ˚, respectively). [5,13] It is worth noting that the crystal structure exhibits disorder indicating the presence of the (R*,R*)-[Me 2 Ga(O,N)] 2 and (R,S)-[Me 2 Ga(O,N)] 2 diastereomers (Figure 2). These diastereomers result from the association of monomeric moieties of the same or opposite configuration as the chiral center in the O,N-chelating ligand.…”

Darstellung, Eigenschaften und Molekülstrukturen von Alkylaluminiumaminoalkoxidchloriden

“…Wegen der Ausbildung der koordinativen N±Al-Bindung wird das Stickstoffatom asymmetrisch koordiniert. Im Gegensatz zu anderen untersuchten Dpm-Chelaten t-Bu 2 Al(Dpm) [23], RAl(Dpm) 2 (R = Me, Et, 1-Nor) [14 b], Me 2 Ga(Dpm) [23], [Me 2 In(Dpm)] 2 [14] sind in 4 beide Konfigurationen des Stickstoffzentrums vorhanden: N1(R), N2(S). Unter den verwandten chiralen Alkylaluminiumaminoalkoxiden verha Èlt sich nur noch [Me 2 AlOCH 2 CH(C 5 H 9 )NH(CH 2 Ph)] 2 in gleicher Weise [20].…”

Darstellung, Eigenschaften und Molekülstrukturen von Dimethylmetallalkoxiden und -amiden des Aluminiums und Galliums

“…Dimethylaluminium-und -galliumalkoxide mit zusa È tzlichen Donoratomen in den Alkoxidresten sind in der Mehrzahl dimer aufgebaut und enthalten stabile M 2 O 2 -Ringe [3±8]. Ausnahmen sind das Dimethylaluminium-(2 S,3 R)-(+)-4-(dimethylamino)-1,2-diphenyl-3-methyl-2-butoxid [3], Di-t-butylaluminium-(S)-a,a-diphenyl-2-pyrrolidinyl-methoxid [9] und das Dimethylgallium-(S)-a,a-diphenyl-2-pyrrolidinyl-methoxid [8] La È ût man Trimethylgallium im Molverha È ltnis 1 : 1 auf o-Methoxyphenylmethylamin einwirken, so erha Èlt man das entsprechende Trimethylgallium-Amin-Addukt 5, welches in siedenden n-Pentan noch nicht zum Amid unter Methanentwicklung abreagiert. 5 bildet farblose, stark luft-und feuchtigkeitsempfindliche Kristalle, die sich gut in aliphatischen und aromatischen Kohlenwasserstoffen lo È sen.…”