The Structure of Hydrotris(pyrazolyl)boratothallium(I)

Abstract

The title compound crystallizes in the monoclinic space group P21 with a = 7.928(6), b = 9.306(4), c = 17.16(2) Å, β = 92.06(8)°, V = 1265(2) Å3, Z = 2, Dcalc = 2.191 g cm–3. From two independent molecular units, metal‐ligand strands are formed based on electrostatic interactions between the thallium centers and pyrazolyl π manifolds from neighboring molecules.

Sodium hydrotris(methimazolyl)borate, a novel soft, tridentate ligand: preparation, structure and comparisons with sodium hydrotris(pyrazolyl)borate †

“…We have found, in line with the work of Riordan, 38 Parkin 39 and Janiak 40 and their co-workers on related systems, that for the preparation of metal complexes the thallium() salt of Tm is more convenient than the sodium salt, particularly when using metal halide precursors. The thallium halide formed during the reaction is insoluble, leaving the clean metal complex in solution.…”

The Structure of the “Third‐Generation” Tris(pyrazolyl)borate Caesium Salt p‐BrC6H4TpCs

“…Such an association between alkali metal atoms and the pyrazolyl π‐system, most probably a consequence of induced dipole interactions between alkali metal cations and the polarisable π‐electron density,9 is not uncommon and has been reported for potassium in polymeric M [pzTp](H 2 O) ( M = Na, K)10 and PhTpK,11 as well as in the polynuclear Tp compound [Tp CF3,CH3 CuK(CO 3 )KTp CF3,CH3 ] 2 12. Further, it has been observed in Tp salts of thallium including the prototypical TpTl 13. More frequently, this type of interaction is observed in pyrazolide (pz – ) complexes,14 such as the kinetically stabilised ruthenocene analogue Cp*Ru(pz*),15 and tetranuclear [Tl 4 (Ph 2 pz) 4 ] 16.…”

Multigram Synthesis of Thallium Trispyrazolylborate Compounds

“…1,2 Then those alkaline metal derivatives are reacted with TlNO3. 11 The main drawbacks of this methodology are the need of an excess of pyrazol, which affect the isolation of KTp x in the first step, and the low yield in the product and the separation of KNO3 in the second step.…”