Bis(diazadiene)iron complexes, (R¹MCR²–CR²NR¹)₂Fe¹

Molecular and Electronic Structures of Homoleptic Nickel and Cobalt Complexes with Non‐Innocent Bulky Diimine Ligands Derived from Fluorinated 1,4‐Diaza‐1,3‐butadiene (DAD) and Bis(arylimino)acenaphthene (BIAN)

“…The class of [M(DAD) 2 ] complexes was expanded by the groups of tom Dieck (M = Fe, [3] Ni [4] ) and von Walther (M = Fe, [5] Co, [5,6] Ni [7] ). Later, several [Ni(DAD) 2 ] complexes were characterized by single-crystal X-ray analysis.…”

Low-valent iron: an Fe(i) ate compound as a building block for a linear trinuclear Fe cluster

“…This is also reflected in the rather long coordinated CQC trop bonds [C4-C5, 1.449(3); C19-C20, 1.448(3)]. X-band EPR spectroscopy of 2, in THF/ 0.1 M [N(nBu) 4 ][PF 6 ] at 20 K, revealed a rhombic signal without any (resolved) hyperfine coupling (Fig. 1b).…”

“…The effective magnetic moment of 1 amounts to m eff = 4.7 m B (Evans' method) indicating a d 6 hs electron configuration at the Fe center. 1 H NMR spectroscopic analysis revealed apparent C s symmetry in solution.…”

“…Analysis of the molecular structure, using single crystal X-ray diffraction, shows a distorted tetrahedral coordination geometry around the metal center and the structural parameters indicate a neutral dad ligand coordinated to Fe(II) with free unbound olefin units (ESI †). 6,7 Reduction of 1 with excess Na or NaH led to formation of the iron(I) compound 2, which was isolated in 73% yield as dark brown single crystalline needles (Scheme 1a). X-ray diffraction analysis of a single crystal showed that complex 2 forms a contact ion pair in the solid state (Fig.…”

Diazadiene als Steuerliganden in der Homogenen Katalyse, VIII [1] Katalytische Trimerisierung substituierter Acetylencarbonsäureester und Isolierung eines Acetylendicarbonsäureester-Diazadien-Nickel(0)-Addukts / Diazadienes as Controlling Ligands in Homogeneous Catalysis, VIII [1] Catalytic Trimerization of Substituted Acetylene Carbonic Acid Esters and Isolation of an Acetylene Dicarbonic Acid Ester Diazadiene Nickel(0) Adduct

“…Für Reaktionen dieses Typs eignen sich insbesonde re Ligand-Nickel-Katalysatorsysteme, wobei als mo difizierende Liganden bis jetzt überwiegend Phosphine verwendet werden [2]. In vorausgehenden A r beiten [3] haben wir gezeigt, daß sich Verbindungen vom Typ der 1.4-Diaza-1.3-c/iene (dad) hervorra gend als Steuerliganden für homogenkatalytische Reaktionen eignen. So stellen Komplexe vom Typ /P (dadhNi oder (dad)Ni(cod) 3 R-C=C -C .…”