Tris(1,10-phenanthroline-κ²N,N′)iron(II) squarate octahydrate

Abstract

In the title compound, [Fe(C12H8N2)3](C4O4)·8H2O or [Fe(phen)3]sq·8H2O, where phen is 1,10‐phenanthroline and sq is the squarate dianion (C4O4)2−, the FeII centre has a distorted octa­hedral coordination geometry comprising six N atoms from the three bidentate chelating phen ligands. An extensive three‐dimensional network of Owater—H⋯O, Owater—H⋯Owater and C—H⋯O hydrogen‐bonding inter­actions is responsible for crystal stabilization.

Tris(5,6-dimethyl-1,10-phenanthroline-κ2N,N′)iron(II) bis(tricyanomethanide)

“…In the complex cation the Fe II ion is bonded to three bidentate dimephen ligands through their nitrogen atoms resulting in a distorted octahedral arrangement with the six Fe1-N distances ranging from 1.957 (2) to 1.968 (2) Å (Table 1). These values as well as the values of N-Fe1-N bite angles (82.88 (9), 82.69 (9), 82.44 (9)°) and opposite (trans) angles (173.92 (9), 176.49 (9), 176.56 (9)°) are comparable to the corresponding distances and angles in other complexes with [Fe(phen) 3 ] 2+ cations (Aparici Plaza et al, 2007;Odoko & Okabe, 2004;Koh et al, 1994;Uçar et al, 2005;Li et al, 2008). All N-Fe1-N bond angles in (I) deviate significantly from the ideal values of 90 or 180° because of the constrained geometry of the dimephen ring systems.…”

“…low spin transition, see: Kö nig & Watson (1970); Mü ller et al (1982). For [Fe(phen) 3 ] 2+ complexes, see: Aparici Plaza et al (2007); Odoko & Okabe (2004); Koh et al (1994); Uçar et al (2005); Li et al (2008). For bond lengths and angles in dimephen, see: Toledano-Magañ a et al (2012) and in tcm ligands, see: Potočň á k et al (2002); Luo et al (2009).…”

Tris(1,10-phenanthroline-κ2N,N′)iron(II) bis(1,1-dicyano-2-ethoxy-2-oxoethanide)

“…The NC-C-CN bond angle are 118.5 (3) and 122.5 (4) o , which are longer than observed in free TCNE (116.5 ( 12) o ) in accord with its sp 2 central carbon atom (Miller, 2006;Lv, et al, 2008). In the cation, the Fe II atom is coordinated by six N atoms from three phen ligands in a distorted octahedral geometry.The average bond length of Fe-N is 1.973 (3) Å and similar to tris(1,10-phenanthroline-2 N,N′)iron(II) squarate octahydrate (Uçar, et al, 2005) as representative example.The crystal structure is mainly stabilized by coulombic interactions. Weak C-H •••N and C-H •••F interactions are also observed, See Table 1.…”

Three forms of squaric acid with pyrazine and pyridine derivatives: an experimental and theoretical study

“…(a) as uncharged H 2 SQ, (b) as the HSQmonoanion, and (c) as SQ 2-dianions on deprotonation by amines. In our ongoing research on squaric acid (3,4-dihydroxy-3-cyclobutene-1,2-dione, C 4 H 2 O 4 ), we have synthesized some mixed-ligand metal(II) complexes and amine salts of squaric acid, and their structures have been reported [13][14][15][16][17][18]. The aim of this research is investigation of supramolecular architectures of title structures together with spectroscopic properties.…”