Sodium tri(pyrazol-1-yl)-germanate and -stannate: new tridentate ‘claw-ligands’ containing group 14 metals

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Abstract
[(thf)3Na{(pz)3Ge}]1 and [(thf)2(pzH)Na{(pz)3Sn}]22(pz = pyrazol-1-yl) are obtained by the reaction of pzNa with GeCl2·dioxane and SnCl2, respectively, in a 3 : 1 molar ratio in thf (thf = tetrahydrofuran); the X-ray structure determination shows that the [(pz)3Ge]– unit in 1 is a tridentate ligand to the sodium, while the [(pz)3Sn]– unit in 2 is only bidentate resulting in dimerisation to produce overall a twelve-membered ring system.