Chiral coordination polymers based on thallium(i) complexes of new bis- and tris(pyrazolyl)borateligands with externally-directed 4-pyridyl groups

Abstract

The new ligands dihydro-bis[3-(4-pyridyl)pyrazol-1-yl]borate (Bp^4py) and hydro-tris[3-(4-pyridyl)pyrazol-1-yl]borate (Tp^4py) are derivatives of the well known bis- and tris(pyrazolyl)borate cores, bearing 4-pyridyl substituents attached to the pyrazolyl C³ positions; crystal structures of the Tl(I) complexes show that both are infinite one-dimensional polymeric chains, in which the Tl(I) centre within each bis-pyrazolyl or tris-pyrazolyl cavity is also connected to a pendant 4-pyridyl residue from an adjacent complex unit to build up the chain.