The First Example of a Crystalline Subvalent Organolanthanum Complex:  [K([18]crown-6)- (η²-C₆H₆)₂][(LaCp^tt₂)₂(μ-η⁶:η⁶-C₆H₆)]•2C₆H₆ (Cp^tt = η⁵-C₅H₃Bu^t₂-1,3)

Rare Earth Arene-Bridged Complexes Obtained by Reduction of Organometallic Precursors

“…Lappert and coworkers isolated two types of bridged, reduced benzene complexes (Chart (Cassani et al, 2002;Cassani et al, 1996;Cassani et al, 1998;Cassani et al, 1999). The two classes differ by the substituent of the cyclopentadienyl ligand (SiMe3 versus tert-butyl, the latter is more sterically demanding due to the shorter C-C than Si-C distance) and the nature of the benzene anion.…”

“…TABLE 6 X-ray structural data for Y 2 K 2 -biph, Sc 2 K 2 -biph, Lu 2 K 2 -biph, Y 2 -biph-K 2 -crown 2 , Y 2 K 2 -terph, and Lu 2 K 2 -TPB (distances in Å and angles in °) (Fryzuk et al, 1997). Cp 2 La(C 6 H 6 )K is [(Cp tt 2La)2(- 6 , 6 -C6H6)] - (Cassani et al, 1998); (Cp 2 Ln) 2 (C 6 H 6 )K represents [K(18-crown-6)][(Cp''2Ln)(C6H6)] (Ln = La, Ce, and Nd) (Cassani et al, 1999). U 2 -biph is from reference (Diaconescu and Cummins, 2012).…”

Mononuclear η6‐Arene Complexes of Lanthanides: One‐Step Syntheses, Crystal Structures, and Arene Exchange

“…[2] The oxidation state of the lanthanide atoms varies from +3 to 0; [3][4][5][6][7][8][9][10][11][12][13][14][15] coordinated-arene ligands may be present in neutral as well as anionic forms. [6][7][8] One of the simple and most effective synthetic routes to mono(arene)-lanthanide complexes, containing arene ligands that are coordinated to the metal in the η 6 mode, is the reaction of a lanthanide halide with aluminium(III) halides in an arene solution. Employing this method, a series of mononuclear complexes of Sm, [3,[9][10][11] La, [6] Nd, [6,10] Gd, [10] Yb, [10] Y, [16] Pr, [16] Eu, [17] and U [3,15] was prepared.…”

A New Route to Neodymium(II) and Dysprosium(II) Iodides

“…[10] Finally, a crystalline X-ray-authenticated La II compound [K( [18] [18]crown-6 in benzene. [11] Recently we have found that thulium, also belonging to the block of ¹trivalentª lanthanoids, may be obtained in the form of the molecular Tm II complex TmI 2 (DME) 3 or TmI 2 (THF) 5 by the reaction of TmI 3 with thulium metal in the appropriate solvent at 70 8C. [12] In this paper we report on the synthesis of the molecular iodides of Nd II and Dy II .…”