Shengming Liu

Water-Free Rare Earth-Prussian Blue Type Analogues: Synthesis, Structure, Computational Analysis, and Magnetic Data of {LnIII(DMF)6FeIII(CN)6}∞(Ln = Rare Earths Excluding Pm)

Water-free rare earth(III) hexacyanoferrate(III) complexes, {Ln(DMF)(6)(mu-CN)(2)Fe(CN)(4)}(infinity) (DMF = N,N-dimethylformamide; Ln = Sm, 1; Eu, 2; Gd, 3; Tb, 4; Dy, 5; Ho, 6; Er, 7; Tm, 8; Yb, 9; Lu, 10; Y, 11; La, 12; Ce, 13; Pr, 14; Nd, 15), were synthesized in dry DMF through the metathesis reactions of [(18-crown-6)K](3)Fe(CN)(6) with LnX(3)(DMF)(n) (X = Cl or NO(3)). Anhydrous DMF solutions of LnX(3)(DMF)(n) were prepared at room temperature from LnCl(3) or LnX(3).nH(2)O under a dynamic vacuum. All compounds were characterized by IR, X-ray powder diffraction (except for 10), and single crystal X-ray diffraction (except for 2, 7, 10). Infrared spectra reveal that a monotonic, linear relationship exists between the ionic radius of the lanthanide and the nu(mu-CN) stretching frequency of 1-10, 12-15 while 11 deviates slightly from the ionic radius relationship. X-ray powder diffraction data are in agreement with powder patterns calculated from single crystal X-ray diffraction results, a useful alternative for bulk sample confirmation when elemental analysis data are difficult to obtain. Eight-coordinate Ln(III) metal centers are observed for all structures. trans-cyanide units of [Fe(CN)(6)](3-) formed isocyanide linkages to Ln(III) resulting in one-dimensional polymeric chains. Structures of compounds 1-9 and 11 are isomorphous, crystallizing in the space group C2/c. Structures of compounds 12-15 are also isomorphous, crystallizing in the space group P2/n. One unique polymeric chain exists in the structures of 1-9 and 11 while two unique polymeric chains exist in structures of 12-15. One of the polymeric chains of 12-15 is similar to that observed for 1-9, 11 while the other is more distorted and has a shorter Ln-Fe distance. Magnetic susceptibility measurements for compounds 3-6, 8, 11 were performed on polycrystalline samples of the compounds.

Cyclic organohydroborate complexes of metallocenes: Part VI. Syntheses and structures of Cp2M{(μ-H)2BR2} (M=Ti, Nb; R2=C4H8, C5H10, C8H14)

Abstract The complexes, Cp2M{(μ-H)2BC4H8} (1: M=Ti; 2: M=Nb), Cp2M{(μ-H)2BC5H10} (3: M=Ti; 4: M=Nb), and Cp2M{(μ-H)2BC8H14} (5: M=Ti; 6: M=Nb), were prepared from the reactions of Cp2MCl2 with the organohydroborate salts, K[H2B2(μ-H)(μ-C4H8)2], K[H2BC5H10], and K[H2BC8H14], respectively. In these reactions, the transition metal is reduced from M(IV) to M(III), producing 17-electron, paramagnetic titanocene complexes (1, 3 and 5) and eighteen electron, diamagnetic niobocene complexes (2, 4 and 6). Single crystal X-ray structures of 1–6 were determined. The molecular structure of Cp2Nb{(μ-H)2BH2} (7) was redetermined using modern CCD techniques.

CCDC 211944: Experimental Crystal Structure Determination

Related Article: R.G.Kultyshev, Shengming Liu, Hoitung T.Leung, Jianping Liu, S.G.Shore|2003|Inorg.Chem.|42|3199|doi:10.1021/ic020600u