Synonyms:Scandium
99% *data from raw suppliers
F,
T,
Xi
F:Highly flammable;The research investigates the novel transformations of lanthanide(III) disiloxanediolates with group 13 metal trialkyls, resulting in the formation of unusual inorganic ring systems containing scandium, yttrium, and group 13 metals. The study focuses on the reactions of scandium and yttrium metallacrown complexes with aluminum and indium trialkyls. Specifically, the scandium metallacrown complex [{(Ph2SiO)2O}2{Li(DME)}2]ScCl?THF reacts with AlMe3 to form the heterotrimetallic inorganic ring system [{(Ph2SiO)2O}2{Li(THF)2}AlMe2]ScCl?THF through an unexpected Li?Al exchange reaction. Meanwhile, the yttrium metallacrown [{(Ph2SiO)2O}2{Li(THF)2}2]YCl?THF reacts with InMe3 to produce the heterobimetallic Y/In disiloxanediolate complex [{(Ph2SiO)2O}2{InMe2(OMe)}2InMe2]Y, where two monomeric Me2InOMe ligands are stabilized through coordination to yttrium. The chemicals that played crucial roles in this research include the starting materials such as the scandium and yttrium metallacrown complexes, the group 13 metal trialkyls (AlMe3 and InMe3), and the solvent THF. The study also mentions the use of DME in the initial scandium complex and the formation of intermediate or by-products like LiAlMe4 or MeLi-DME adducts, although their exact roles and fates in the reactions are not fully clarified.
The study, titled "Phosphinidene Complexes of Scandium: Powerful PAr Group-Transfer Vehicles to Organic and Inorganic Substrates," investigates the synthesis and reactivity of scandium phosphinidene complexes. The researchers utilized the (PNP)Sc(III) scaffold to create reactive scandium phosphinidene complexes. They synthesized a dinuclear scandium phosphinidene complex, [(PNP)Sc(μ2-P[Trip])]2, by reacting (PNP)Sc(CH3)Br with LiPH[Trip]. Additionally, they prepared a mononuclear phosphinidene ate complex, [(PNP)Sc(μ2-P[DMP])(μ2-Br)Li], by treating LiP(H)[DMP] with (PNP)Sc(CH3)Br. These complexes demonstrated significant reactivity, engaging in phospha-Wittig chemistry with ketones and phosphorus dichlorides, and facilitating intermetal phosphinidene group transfer. The study highlights the potential of these scandium phosphinidene complexes as powerful reagents for delivering PAr units to various substrates, showcasing their utility in organic and inorganic transformations.
The study explores a novel ligand design for ?-diketiminato ligands to enhance the thermal stability of organoscandium complexes. The researchers introduced a "remote steric bulk" strategy, relocating the bulky groups from the ortho to the meta positions on the N-aryl substituents and increasing their size. This approach aims to stabilize low-coordinate organoscandium complexes by preventing metalation pathways that typically lead to decomposition. The study involves the synthesis of new ligands (1 and 2) using 2,4-pentanedione and specific anilines. These ligands were then used to form dialkyl scandium complexes (3 and 4) through reactions with scandium tris-alkyls. The resulting complexes exhibited significant improvements in thermal stability, with no signs of decomposition even when heated to over 100°C. The study also explored the reactivity of these complexes with activating reagents like [HNMe2Ph][B(C6F5)4] and [CPh3][B(C6F5)4], forming new cationic complexes (5 and 6) that retained remarkable thermal stability. These findings suggest that the redesigned ?-diketiminato ligands offer a promising strategy for stabilizing low-coordinate compounds of early transition and main group metals.
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