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A Metal‐Containing N‐Heterocyclic Germylene Based on an Oxalamidine Framework
Author(s) -
Moos Eric M. B.,
Feuerstein Wolfram,
Krämer Felix,
Breher Frank
Publication year - 2018
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800298
Subject(s) - chemistry , trifluoromethanesulfonate , metal , yield (engineering) , density functional theory , crystallography , ligand (biochemistry) , rhodium , medicinal chemistry , stereochemistry , catalysis , computational chemistry , organic chemistry , materials science , biochemistry , receptor , metallurgy
A metal‐containing N‐heterocyclic germylene based on a N ‐mesityl (Mes)‐substituted oxalamidine framework is reported. The precursor (MesN=) 2 C–C(–N(H)Mes) 2 ( 1 H 2 ) was converted into its rhodium complex [Rh(κ 2 N‐ 1 H 2 )(cod)][OTf] ( 2 ) (cod = 1,5‐cyclooctadiene; OTf = triflate) in 62 % isolated yield. Subsequent reaction of 2 with Ge{N(SiMe 3 ) 2 } 2 gave the crystalline N‐heterocyclic germylene [Rh(cod)(μ‐ 1 )Ge][OTf] ( 3 ) in 50 % yield. The compounds under study were fully characterized by various methods, also including X‐ray crystallographic studies on single crystals of 2 and 3 . Density functional theory (DFT) calculations revealed that π conjugation in the bridging oxalamidine framework is increased and n(N)–p(Ge) π bonding is decreased upon κ 2 N metal coordination; a further weakening of the Ge–N bond occurs through triflate coordination to the Ge II atom. Nevertheless, preliminary coordination studies revealed that 3 behaves as 2‐electron ( L ‐type) germylene donor ligand. Treatment of 3 with [Ir(cod)Cl] 2 furnished the heterobimetallic complex [Rh(cod)(μ‐ 1 )Ge‐Ir(cod)Cl][OTf] ( 4 ), as evidenced by NMR spectroscopic investigations and DFT calculations.

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