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Molecular sketches of Sn-, Ge- and Si-compounds with ligands of the α-aminophosphonic acid or α-aminophosphinic acid type. For compounds XXVII, 14 and the set of compounds XXVIII, the E⋯N distances (E = Sn, Ge, Si) in Å are listed. For compounds XXX and XXXI, dashed lines indicate intermolecular Sn⋯O coordination in the crystal structure.
