Structure metal borates, crystal

The potassium salt of the podand ligand tris[3-(2-pyridyl)-pyrazol-l-yl]borate O Tp) reacts with thorium tetra(nitrate) to generate the complex (P Tp)Th(N03)3. The crystal structure of the complex reveals that the metal center is 12-coordinate, binding to the six nitrogen atoms of the podand ligand, and to two of the oxygen atoms of each nitrate. The molecule has three-fold symmetry, and the nitrates are located between the bidentate arms of the podand. 

Reaction of potassium tris(pyrazolyl)borate with [Pd(Me)2(pyridazine)] or [Pd(Me)(Ph)(tmeda)] produces the anions [Pd(Me)(R)(HB pyrazolyl 3)], R = Me, Ph respectively. Treatment with wet ketone produces the Pd(IV) alkyls [Pd(Me)2(R)(HB pyrazolyl)3)]. The trimethyl product has been ciystallographically charactmsed. The net reaction is oxidation of Pd(II) by water accompanied by a methyl group transfer. Allenyl and propargyl halides add trans across the metal centres in [Pd(PPh3)4] and [Pt(PPh3)4], The isomerisation of the o- allenyl products [M(X)(CH=C=CRR )] has been studied and the crystal structure of one example has been determined. 

See colour insert.) (a) Crystal structure of monoclinic LiMBOj (M = Mn, Fe and Co), (b) MO5 and (c) LiO chains are interconnected by trigonal planar BOj. BOj is highlighted with bold dashed line. (Reprinted with permission from D.-H. Seo et al. First-principles study on lithium metal borate cathodes for lithium rechargeable batteries, Phys. Rev. B S3,2011,205127. Copyright 2011, American Physical Society.)... 

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