Synonyms:Yttrium
99.9% *data from raw suppliers
C
Xi
Xn
F
C,Xi,Xn,F:;The research focuses on the synthesis and characterization of a series of group 3 metal complexes using the hexadentate ligand (SiMe2NPh)3-tacn)3-. The purpose of the study was to explore the coordination chemistry of these metals with macrocyclic ligands, which have potential applications in nuclear magnetic resonance imaging, luminescent probes, diagnostic imaging, catalysis, and lanthanide separation. The researchers synthesized complexes of yttrium, europium, ytterbium, and uranium with the ligand, and found that these complexes displayed trigonal prismatic structures with the six nitrogen atoms of the ligand defining parallel planes. The larger ionic radius of lanthanum allowed for the coordination of a THF ligand, while the uranium(IV) halides formed seven-coordinate molecular complexes with a bicapped trigonal bipyramidal geometry.
The research focuses on the synthesis and properties of heteroleptic dibenzyl yttrium and erbium iodides [Ln(Bn)2(I)(THF)3] (Ln = Y (1), Er (2); Bn = CH2C6H5), which are notable for their thermal stability and resistance to ligand scrambling. These complexes serve as precursors to yttrium and erbium T-shaped carbenes. The study demonstrates the synthetic utility of 1 and 2 by reacting them with H2BIPM to produce phosphorus-stabilized yttrium and erbium carbenes [Ln(BIPM)(I)(THF)2] (Ln = Y (3); Er (4); BIPM = {C(PPh2NSiMe3)}2-). The research involves the use of various reagents, including [Y(I)3(THF)3.5]21 and [K(Bn)]20 for the preparation of 1, and analogous reagents for the synthesis of 2. The compounds were characterized using X-ray crystallography, multinuclear NMR spectroscopy, FTIR spectroscopy, room-temperature Evans method solution magnetic moments, and CHN microanalyses. The study also includes DFT calculations to analyze the bonding and electronic structure of the synthesized compounds.
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 investigates the reactivity and structure of trimetallic organoyttrium hydride complexes, specifically focusing on [[(C5H5)2Y(p-H)]3(p3-H)][Li(THF)4] (1) and its derivatives. The researchers reacted 1 with varying amounts of methanol (CH3OH) to form complexes 2, 3, and 4, where the hydride ligands were progressively replaced by methoxide groups. The study found that the trimetallic structure remained intact during these reactions, and the reactivity of the hydride ligands varied based on their position within the complex and the steric environment. The central triply bridging hydride was particularly unreactive due to steric protection. The study also included an X-ray crystallographic analysis of a derivative of complex 4, revealing the arrangement of the trimetallic core and the interaction of lithium ions with the cyclopentadienyl rings. This research provides insights into the polymetallic chemistry of yttrium complexes and their potential for controlled reactivity.
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