Evaluation of the .pi.-bonding ability of imidazole: structure determination and characterization of catena-(H2O)2(1-CH3im)2Mg(.mu.-CN)(CN)4(1-CH3im)Fe(III).cntdot.H2O (1-CH3im = 1-methylimidazole)

Structural characterization of heteropolymeric iron and main group metal complexes

“…The iron atoms exist in the oxidation states 0, + 2 and + 3, from which + 3 by far prevails. The inner coordination sphere about iron atoms are Fe (0) (Achak et al , 1996 ), Hg (Sosinski et al , 1983 ), FeC 10 (Mammano et al , 1977 ;Graziani et al , 1980 ;Yukle et al , 1996 ), FeC 3 HBr 2 (Enland et al , 1997 )]; Fe(II): [FeN 3 ( H ö hn et al, 1991 ), FeS 4 (Achak et al , 1996 ;Bowers et al , 1996 ;Akari et al , 1998 ), FeC 6 (Adam et al , 1990 ;Behrens et al , 1991 ;Schwarz et al , 1996 ;Yian et al , 1996 ), FeN 5 O and FeN 4 O 2 (Cingi et al , 1985 )]; Fe(III): [FeC 5 N (Castellano et al, 1977, Kl ü fers andHauss ü l, 1985 ;Mulliza et al , 1990 ;Navaza et al , 1990 ;Johnson et al , 1991 ), FeC 6 (Mayer and Pichard , 1988 ;Meyer and Pickerdt , 1989 ;Swartner et al , 1997 ), FeO 4 N 2 (Pavel č í k and Kettmann, 1983 ), FeO 6 (Burger and Kl ü fers, 1966a,b ;Calogero et al , 1977 ), FeO 5 N 2 (Cohen and Hoard , 1966 ;Solans et al , 1984a,b ), and FeO 4 N 3 (Chuklianova et al , 1981 )]. The mean Fe(0)-L bond distance elongated in the order: 1.69 ( μ -H) < 1.78 ( μ -CO) < 2.045 (C, cp) < 2.317 (Zn) < 2.522 (Hg) < 2.627 (In) < 2.641 (Bi).…”

“…The inner coordination sphere about the M atoms are: MgN 4 O 2 (Johnson et al , 1991 ), CaN 4 O 2 (Mayer and Pichard , 1988 ) and CaO 7 (Cohen and Hoard , 1966 ;Pavelč í k and Kettmann, 1983 ); SrO 9 + SrO 10 (Burger and Kl ü fers, 1966b ), SrO 3 N 2 + SrO 8 (Meyer and Pickerdt , 1989 ), Sr 4 O 2 (Castellano et al , 1977 ) and SrN 5 ( H ö hn et al, 1991 ); BaO 8 (Burger and Kl ü fers, 1966a,b ;Calogero et al , 1977 ), BaO 3 N 3 + BaO 5 N 2 (Meyer and Pickerdt , 1989 ), BaN 5 ( H ö hn et al, 1991 ), BaO 5 N 4 + BaO 2 N 2 (Kl ü fers and Hauss ü l, 1985 ), BaN 5 O 4 (Navaza et al , 1990 ), BaO 11 (Solans et al , 1984b ) and BaO 9 (Chuklianova et al , 1981 ); InFe 4 (Che -Chieh et al, 1993 ), TlN 6 (Swartner et al , 1997 ), TlO 7 (Solans et al , 1984a ) and TlN 3 (Yukle et al , 1996 ); GeS 4 (Achak et al , 1996 ;Bowers et al , 1996 ;Akari et al , 1998 ), GeSe 4 (Akari et al , 1998 ); SnC 3 ON + SnC 3 N 2 (Adam et al , 1990 ;Behrens et al , 1991 ;Schwarz et al , 1996 ;Yian et al , 1996 ), SnC 3 O 2 (Graziani et al , 1980 ); BiCl 6 (Mammano et al , 1977 ), BiCl 2 Fe 2 (Enland et al , 1997 ), ZnC 4 Fe 2 (Pierpont et al , 1982 ), CdN 5 O (Mulliza et al , 1990 ), HgC 2 Fe 2 (Sosinski et al , 1983 ) and HgS 4 (Cingi et al , 1985 ).…”

“…The structure of the red orange monoclinic FeMg complex (Johnson et al , 1991 ) contains (NC) 5 Fe(1-Meim) 2-units linked in extended chains through bridging CN groups (cis to 1-Meim), which are coordinated to the oxygen atoms ( Figure 1 ). Two N(NC -) and two O(OH 2 ), and two N(1-Meim), coordinated to Mg(II) atom (MgN 4 C 2 ).…”

“…View of the structure of (1-Meim)(NC) 3 Fe( μ -CN) 2 Mg(H 2 O) 2 (1-Meim)(Johnson et al , 1991 ). In red monoclinic [(H 2 O)(Fe(dcta)Ca(H 2 O) 8 ]…”

An iron(III) complex salt containing pyrazole as both ligand and counter-ion: bis(1H-pyrazol-2-ium) pentacyanido(1H-pyrazole-κN 2)ferrate(III)

“…Strong -donor properties and the ability to coordinate via the C or N atom or both have placed the cyanide ligand centrally in the preparation of ligand-bridged metallic compounds. Plentiful zero-, one-, two-and three-dimensional iron compounds, in which the iron centres are commonly connected by small anionic bridging ligands such as cyanide (Johnson et al, 1991;Lescouë zec et al, 2002;Li, Clé rac et al, 2006;Kim et al, 2004;Zhang et al, 2010Zhang et al, , 2013 have been synthesized and characterized for the purpose of designing new substances with appealing physical properties. The numerous formations of such Fe III complexes are based upon the alterable coordination geometry of the iron cation owing to the wide range of diverse atom connections.…”