1220508-55-3Relevant articles and documents
Fourth generation scorpionates: Coordination behavior of a new class of conformationally flexible mixed-donor (pyrazol-1-yl)borates
Mutseneck, Elena V.,Bieller, Susanne,Bolte, Michael,Lerner, Hans-Wolfram,Wagner, Matthias
, p. 3540 - 3552 (2010)
The coordination behavior, the conformational flexibility, and the stability of the novel (pyrazol-1-yl)borate ligands [Ph(pz)B(μ-N(Me))(μ- pz)B(pz)Ph]- ([L1]-), [Ph(pz)B(μ-O)(μ-pz)B(pz)Ph]- ([L2]-), and [Ph(pz)B(μ-O)(μ-OB(Ph)O)B(Pz)Ph]2- ([L3] 2 ) have been experimentally assessed by investigating the following compounds: [Ll(thf)L1], [Li(thf)L2], [Mg(CI)(thf) xL1], [Mg(CI)(thf)2L2], [Mn(CO) 3L2], K(thf)[Mn(CO)3L3], [CoCI 2(HL1)], [L1Co(μ-CI)2CoL1], [Zn(Br)L1], [Cu(CI)L1], [Cu(CI)L2]. The L-complexes were prepared from a mixture of HL1 and the appropriate metal salt by addition of a base. HCl elimination from [CoCI2(HL 1)], which gives [L1Co(μ-CI)2CoL1], does not necessarily require the assistance of a base, but happens spontaneously when a solution of the complex Is stored at room temperature for several days. K(thf)[Mn(CO)3L3] was obtained via in situ hydrolysis of HL1[Mn(CO)5Br] in the presence of K2CO 3. In some other cases, formation of the coordination compounds proceeded with decomposition of a part of the ligand molecules and yielded pyrazole (e.g., [Zn(CI)(Hpz)L2]) or pyrazolide (e.g., [L 2Co(μ-CI)(μ-pz)CoL2]) complexes. As evidenced by the crystal structure analyses of [Zn(Br)L1l/[Mg(CI)(thf) 2L2]/[Mn(CO)3L2] on the one hand and [L1 Mg(μ-CI)2Mg(thf)L1]-[Cu(CI)L 1]-[Cu(CI)L2]2 on the other, [L1]- and [L2]- are able to adopt both a facial and a meridional conformation. Moreover, while many of the established design principles of scorplonate chemistry are still valid for [L1]-, [L2]-, and [L3]2-, the bonding situation of the central donor moiety (N(Me) in [L1]-; O in [L2]-, [L3] 2-) is distinctly different from the way the pyrazolyl rings are attached to the molecule, so that donor scrambling is not an issue in these [N,N,N] and [N,O,N] mixed-donor ligands. 2010 American Chemical Society.
