The Lewis acidity of organolanthanides. The interaction of cyclopenta-dienyl-lanthanides with some carbonyl and nitrosyl complexes

μ-Coordination chemistry of NO ligands: Adducts of trans-Mo(dmpe)2(H)(NO) with lithium salts

“…In summary, the reactions of the hydride Mo(dmpe) 2 (H)(NO) 1 with the lithium reagents LiHB(C 2 H 5 ) 3 and LiN(SiMe 3 ) 2 afford 1/lithium reagent adducts, which are based on the coordination of the nitrosyl group to the lithium ion. For LiBH 4 , even two 1/LiBH 4 compounds with different compositions and structures are obtained.…”

“…The terminal binding mode of the BH À 4 groups as in 4 has been found only in one case with a crown ether as ligand [16]. Apparently the presence of the structural feature of the terminal binding mode of the BH À 4 groups in 4 is attributed to the competition between the BH À [17], but it is not especially short when compared with the value of 2.19(4) Å of the monomeric complex (THF) 3 Li(l-H) 3 BC(SiMe 2 Ph) 3 [18]. The Li-Li distance is 2.63(3) Å , which is a significantly closer contact than that in [TME-DA AE LiBH 4 ] 2 (3.089(9) Å ).…”

“…The first investigation on the Lewis basicity of the NO ligand was made by Legzdins and his coworkers. They studied the interaction of CpCr(NO) 2 Cl and CpM(CO) 2 (NO) (M = Cr, Mo, W) with R 3 Ln (R = Cp, Cp 0 ; Ln = Sm, Er, Yb, Ho, Dy) in solution by IR and NMR spectroscopy [3]. The Lewis basicity of the nitrosyl was indicated by IR and 1 H NMR spectroscopic changes accompanied by lowering of the m(NO) frequencies, which occur upon adduct formation.…”

Zur Reaktion von Metall-koordiniertem Kohlenmonoxid mit Yliden, X [1] β-Phosphoniocarben-, β-Phosphonio vinyl-und Phosphor-Ylid-Komplexe des Chroms und Cobalts aus Tetramethylphosphonium- [(trimethylphosphoranyliden)acetyl-metallaten] / Reactions of Metal Coordinated Carbon Monoxide with Ylides, X [1] β-Phosphoniocarbene, β-Phosphoniovinyl and Phosphorus Ylide Complexes of Chromium and Cobalt Deriving from Tetramethylphosphonium [(trimethylphosphoranyliden)- acetyl-metallates]

“…Das Ylid Me3P=CH2 [16] und die Übergangsmetall-Komplexe Cp(C0)2(N0)Cr [17], (CO)3(NO)CO [18] und (C0)2(Me3P)(N0)Co [19] wurden nach bekannten Verfahren hergestellt. Me0S02F und Mel wurden käuflich erworben.…”

Synthesis of dicarbonyl and halogeno complexes of (η-pentamethyl-cyclopentadienyl)(nitrosyl)-molybdenum and -tungsten. Crystal structure of [{Mo(η5-C5Me5)(NO)Br(µ-Br)}2]

“…Under appropriate conditions the reaction of [ M (q5-C,Me,) (NO) (CO),] [ M = Mo, (1 ); or W, (2)] with X, (X = CI, Br, or I) gives [{M(q5-C,Me,)(NO)X,},]…”