The First Metal Complexes of the Proton Sponge 1,8‐Bis(N,N,N′,N′‐tetramethylguanidino)naphthalene: Syntheses and Properties

Abstract

In this work we report on the syntheses and properties of the first transition metal complexes of the proton sponge 1,8-bis(N,N,NЈ,NЈ-tetramethylguanidino)naphthalene (btmgn show some interesting details. X-ray crystallographic studies reveal that the naphthyl aromatic systems in both complexes are not planar, the metal atoms reside above the "best-plane" of the naphthyl systems and the compounds adopt a chiral conformation in the crystalline phase.

On the Electronic Structure of NiII Complexes That Feature Chelating Bisguanidine Ligands

“…It is worth comparing the structure with those of its heavier homologues [(btmgn)PdCl 2 ] and [(btmgn)PtCl 2 ]. [21] As anticipated, the Pd and Pt homologues feature a planar coordination around the Group 10 metal, …”

“…[21] It turned out that btmgn can also be used as a ligand in Ni complexes. Figure 2 illustrates the molecular structure of the [(btmgn)NiCl 2 ] complex and Table 2 contains selected structural parameters.…”

“…In comparison with the btmgbp ligand, the chelating btmgb and btmgn are more rigid. Recently the syntheses of Pt complexes of btmgb [20] and Pd and Pt complexes featuring the btmgn [21] ligand were Scheme 1. Tetrakis(tetramethylguanidino)benzene (ttmgb) can be readily oxidized in air or by I 2 .…”

Synthesis of Trinuclear, Dinuclear and Mononuclear Carbamato‐Zinc Complexes from Tetranuclear Precursors: A Top‐Down Synthetic Approach to New Carbamates

“…Hence in 5 the Zn atom is 122.0 pm above this plane. However, in contrast to the Pd and Pt complexes [(btmgn)PdCl 2 ] and [(btmgn)PtCl 2 ], [9] the naphthyl system in 5 remains planar. At 206.0(7) and 207.4(7) pm, the two Zn-N distances from the Zn to the directly bound N atoms of the btmgn ligand are relatively large.…”

“…The Zn-O distance in 5 [198.7(4) pm] is slightly larger than the Zn-O distances in 3 [196.3(1) and 195.3(1) pm]. As already observed in the case of complexes of group 10 metals with btmgn ligands, [9] the metal is not located in the plane defined by the naphthalene aromatic system. Hence in 5 the Zn atom is 122.0 pm above this plane.…”