[Tl(Ph2pz)] (Ph2pz = 3,5-diphenylpyrazolate) crystallises in two forms. The first from benzene has trinuclear molecules [Tl33(Ph2pz)3] 1 linked by intermolecular Tl-jr-t|6-Ph contacts. Within 1 the three thallium atoms are different, having coordination numbers of two (but also with theTl... η)6-Ph contact), three and four, whilst u-tin1, μs-η2:η1)2:1 and (the new) μs-η2:η1 modes of Ph2pz coordination are observed. Crystallisation of [TI(Ph2pz)] from 1,2-dimethoxyethane (dme) gives tetranuclear molecules [Tl4(Ph2pz)4] 2 solvated by dme. Three or four coordinate Tl atoms are observed with μs-η2:η1 and μs-η2:η1-pyrazolate coordination. In addition there is an intermolecular Tl-μs-η2:η1-Ph interaction linking the tetranuclear molecules into a polymer, and sundry intramolecular Tl ⋯C contacts, the most important of which is an unsymmetrical Tl-μs-η2:η1-Ph2pz interaction. Crystallisation of [Tl(Ph2pz)] or [Tl(MePhpz)] (MePhpz = 3-methyl-5-phenylpyrazolate) from dichloromethane afforded the partially hydrolysed tetranuclear cages [Tl4(Ph2pz)3(OH)] 3 or [Tl4(MePhpz)3(OH)] 4, which associate to give a dimer and a polymer respectively owing to Tl ⋯ Tl interactions, supported for the dimer by an intercage distant μs-η2:η1-Ph2pz contact. Complex 3 features three and four coordinate Tl atoms and μs-η2:η1 and μs-η2:η1-pyrazolate binding, whilst 4 has three, four and five coordinate thallium atoms and solely μs-η2:η1-pyrazolate ligands.