Institution: | a Institut für Anorganische Chemie der Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany b Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, D-39106 Magdeburg, Germany c Dipartimento di Chimica dell'Università di Siena, Pian die Mantellini 44, I-53100 Siena, Italy |
Abstract: | The diorganomercurial bis2-(N,N-dimethylaminomethyl)ferrocenyl]mercury(II), (FcN)2Hg (3), can be obtained by the symmetrisation of the heteroleptic (FcN)HgCl (2) with Na2S2O3 or in the transmetallation reaction of 2 with (FcN)Li. By crystallisation only the crystals of rac-(FcN)2Hg were obtained. X-ray diffraction analysis revealed linear coordinated mercury atom with two η1-bonded FcN ligands. Additionally, weak chelate interactions exist between mercury and nitrogen atoms of the ---CH2NMe2 side chains. According to the 1H-NMR findings, these interactions are not preserved in solution. Diorganomercurial 3 appears in solution as a mixture of two diastereomers with rac/meso-(FcN)2Hg ratio of 1:1. This diastereomeric ratio in solution remains constant within a wide temperature range and in different solvents. The NMR spectroscopic data of the heteroleptic organomercurials (FcN)HgCl]2·H2O (1) and (FcN)HgCl (2) indicate the chelate-free structure of this compounds in solution within the studied temperature interval (−80 to 90 °C). |