A method for the synthesis of nickel(0) bis(carbene) complexes

A new method leading to Ni(NHC)2 (NHC = IMes, IPri, SIPri, SIBut) complexes in moderate to good yields, involves the reaction of NHC (pre-formed or generated in situ) with Ni(CH3)2(tmed), tmed = N,N-tetramethylethylenediamine; in one case, the intermediate Ni[I(Me2)Pri]2(CH3)2, I(Me2)Pri = N,N-diisopropyl-4,5-dimethylimidazol-2-ylidene, has been isolated and structurally characterised

Cu(II) and Pd(II) complexes with adenine and histidine derivatives

Some derivatives of adenine (I, II, III, IV) and histidine (II, V) were prepared using the Mannich Reaction. Their structure was established from IR and mass spectral data. These derivatives were then used as ligands for the preparation of Cu(II) and Pd(II) complexes, which may have biological action. The structures of the complexes were investigated by IR and E.S.R. spectroscopy. Finally a complex of (II) with Fe(II) was prepared and studied by IR, E.S.R. and Mössbauer spectroscopy. © 1981

Transition Metal Chain Complexes Supported by Soft Donor Assembling Ligands

The chemistry of discrete molecular chains constituted by metals in low oxidation states, displaying metal-metal proximity and stabilized by suitable metal-bridging, assembling ligands comprising at least one soft donor atom is comprehensively reviewed; complexes with a single (hard or soft) bridging atom (e.g., μ-halide, μ-sulfide, or μ-PR2 etc.) as well as "closed"metal arrays (that fall in the realm of cluster chemistry) are excluded. The focus is on transition metal-based systems, with few excursions to cases combining transition and post-Transition elements. Most relevant supporting ligands have neutral C, P, O, or S donor (mainly, N-heterocyclic carbene, phosphine, ether, thioether) or anionic donor (mainly phenyl, ylide, silyl, phosphide, thiolate) groups. A supporting-ligand-based classification of the metal chains is introduced, using as the classifying parameter the number of "bites"(i.e., ligand bridges) subtending each intermetallic separation. The ligands are further grouped according to the number of donor atoms interacting with the metal chain (called denticity in the following) and the column of the Periodic Table to which the set of donor atoms belongs (in ascending order). A complementary metal-based compilation of the complexes discussed is also provided in a concise tabular form.

Cu(II) and Pd(II) complexes with adenine and histidine derivatives

Some derivatives of adenine (I, II, III, IV) and histidine (II, V) were prepared using the Mannich Reaction. Their structure was established from IR and mass spectral data. These derivatives were then used as ligands for the preparation of Cu(II) and Pd(II) complexes, which may have biological action. The structures of the complexes were investigated by IR and E.S.R. spectroscopy. Finally a complex of (II) with Fe(II) was prepared and studied by IR, E.S.R. and Mössbauer spectroscopy. © 1981

Metal complexes with 'pincer'-type ligands incorporating N-heterocyclic carbene functionalities

The coordination and organometallic chemistry of linear, rigid, tridentate ligands, which incorporate at least one N-heterocyclic carbene and other ‘classical’ donors, is reviewed across the periodic table with emphasis on unique features due to the presence of the N-heterocyclic carbene donor.<br/

N-heterocyclic carbene complexes of copper, nickel, and cobalt

The emergence of N-heterocyclic carbenes as ligands across the Periodic Table had an impact on various aspects of the coordination, organometallic, and catalytic chemistry of the 3d metals, including Cu, Ni, and Co, both from the fundamental viewpoint but also in applications, including catalysis, photophysics, bioorganometallic chemistry, materials, etc. In this review, the emergence, development, and state of the art in these three areas are described in detail. © Copyright 2019 American Chemical Society