419562-69-9Relevant articles and documents
Tl(I) complexes of cymantrene-based tris(1-pyrazolyl)borates: Polymers and macrocycles
Guo,Bats,Bolte,Wagner
, p. 3572 - 3576 (2001)
Cymantrene-based tris(1-pyrazolyl)borates have been synthesised from the reaction of CymBBr2 and Cym'BBr2 with pyrazole (Hpz) in the presence of triethylamine [Cym: cymantrenyl; Cym': (methyl)cymantrenyl]. The Tl(I) salts CymB(pz)3Tl,2a, and Cym'B(pz)3Tl,2b, have been structurally characterised by X-ray crystallography. Similar to the corresponding complex FcB(pz)3Tl (Fc: ferrocenyl), CymB(pz)3Tl features a polymeric structure with bridging [B(pz)3] fragments in the solid state. Cym'B(pz)3Tl shows a related oligomeric structure. This time a macrocyclic tetramer rather than a linear chain is observed. To provide a ligand of high solubility in non-polar solvents, compound Cym'B(pz4-R)3Tl, [R = CH2(C6H11)]2d, has been synthesised, which shows a reduced symmetry at the organometallic moiety, together with (cyclohexyl)methyl substituents in the 4-positions of all pyrazolyl rings.