Group 10-group 14 metal complexes [E-TM]IV: The role of the group 14 site as an L, X and Z-type ligand

Erik Wächtler, Robert Gericke, Erica Brendler, Birgit Gerke, Thorsten Langer, Rainer Pöttgen, Lyuben Zhechkov, Thomas Heine, Jörg Wagler

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Abstract

A series of new complexes of a general motif [R2E(μ-N,S)2TM-L] (E: metalloid group 14 element; TM: group 10 metal; R: Cl, Ph, pyS, OH, (N,N,O)-chelating ligands; N,S: 1-methylimidazole-2-thiolate (methimazolyl, mt-), pyridine-2-thiolate (pyS-); L: PPh3, PCy3, pyS) was synthesised and characterised by single-crystal X-ray diffraction, multi-nuclear NMR spectroscopy (1H, 13C, 31P, 119Sn), 119Sn Mössbauer spectroscopy and quantum chemical calculations. The E-TM bonding situation in these compounds can be described with various resonance structures which comprise E(ii)→TM(ii), E(iii)-TM(i) and E(iv)←TM(0) features. Thus, in these complexes the atoms of the group 14 based ligand sites reveal L-, X- and Z-type ligand characteristics. A systematic comparison between structural and spectroscopic parameters as well as the results from NLMO analyses of structurally related compounds provided information about the differences in the E-TM bonding situation upon alteration of the metal atoms or ligand patterns. Under investigation are the structurally related compounds [Cl2Sn(μ-pyS)2TM-PPh3] (1: TM = Pd; 2: TM = Ni; 3: TM = Pt), [Cl2Ge(μ-pyS)2Pd-PPh3] (4) and, for in silico analysis, [Cl2Si(μ-pyS)2Pd-PPh3] (5), which indicate a pronounced shift of the E-TM bond electron pair towards TM for TM = Pt. Further complexes serve as representatives of these compounds with different bridging ligands {[Cl2Sn(μ-mt)2Pd-PPh3] (8)}, different trans-E-TM-bound ligands {[Cl2Sn(μ-pyS)2Pd-PCy3] (9), [Cl2Sn(μ-pyS)2Pd]4 (10)} and with different substituents at Sn (including penta- and hexacoordinated tin compounds), i.e., [R2Sn(μ-pyS)2Pd-PPh3] with R = Ph (6) and pyS (7), [(O,N,N)Sn(μ-pyS)2Pd-PPh3] (11) and (12) having two different (O,N,N) tridentate ligands, and [(μ-OH)ClSn(μ-pyS)2Pd-PPh3]2 (13). The latter series indicates a shift of the E-TM (= Sn-Pd) bond electron pair towards Pd upon transition from penta- to hexacoordinated tin compounds.

Original languageEnglish
Pages (from-to)14252-14264
Number of pages13
JournalDalton Transactions
Volume45
Issue number36
DOIs
Publication statusPublished - 2016 Jan 1

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

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    Wächtler, E., Gericke, R., Brendler, E., Gerke, B., Langer, T., Pöttgen, R., Zhechkov, L., Heine, T., & Wagler, J. (2016). Group 10-group 14 metal complexes [E-TM]IV: The role of the group 14 site as an L, X and Z-type ligand. Dalton Transactions, 45(36), 14252-14264. https://doi.org/10.1039/c6dt01621a