Self-Assembly of Tetrahedral and Trigonal Antiprismatic Clusters [Fe4(L4)4] and [Fe6(L5)6] on the Basis of Trigonal Tris-Bidentate Chelators Chelate Complexes, Part 19. Part 18: R. W. Saalfrank, I. Bernt, F. Hampel, Chem. Eur. J. 2001, 7, 2770–2774.

Supramolecular Coordination Chemistry: The Synergistic Effect of Serendipity and Rational Design

“…This profound, non-dissociative transformation can be monitored by NMR spectroscopy, which reflects the enantiotopization of the diastereotopic methylene protons. [11j, 29] Supplementary support for the interpretation of the temperature-dependent dynamic 1 H NMR spectra of 48 is presented by additional studies of (D,D,D,D)/(L,L,L,L)-[(EtNH 3 ) 4 \{Mg 4 (L 2 ) 6 }] (49). In 48 and 49, the methylene protons of the ligands exhibit identical variable-temperature (VT) NMR spectra.…”

“…The neutral mixed-valent complexes [M&{Fe II Fe III 3 (L) 6 }] (50) are available according to the direct method in a one-pot reaction from dialkyl malonates with methyllithium, iron(II) chloride, and oxalyl chloride (FeCl 2 /(COCl) 2 = 20:1) with subsequent aerobic aqueous ammonium chloride or alkalimetal chloride workup (Scheme 21). [30] However, when aqueous solutions of tetramethylammonium chloride, lithium chloride, or alkaline-earth-metal chlorides were used, aerobic workup afforded the all-iron(III) complexes [H 2 O&{Fe III 4 (L) 6 }] (51). Accordingly, [NH 4 &-{Fe III 4 (L) 6 }] + (NH 4 -52) was synthesized directly, starting with iron(III) chloride and followed by workup with an aqueous solution of ammonium acetate instead of ammonium chloride.…”

Poly[methylammonium tris(μ2-formato-κ2O:O′)cobalt(II)]

“…[Symmetry codes: (i) Àx + 1 2 , Ày, z + 1 2 ; (ii) Àx, Ày, Àz; (iii) Àx, y + 1 2 , Àz; (iv) x + 1 2 , y, Àz + 1 2 ; (v) x, Ày + 1 2 , z; (vi) x À 1 2 , Ày + 1 2 , Àz + 1 2 ; (vii) x À 1 2 , Ày + 1 2 , Àz À 1 2 ; (viii) Àx + 1 2 , Ày + 1, z À 1 2 ; (ix) Àx + 1 2 , Ày + 1, z + 1 2 .] longer, at 5.855 (1) and NABHAZ01 (Sernau, Huttner, Scherer & Walter, 1996)]; in other cases, the formate group behaves as a bridging species between Co atoms [OXCFOR (Cornils et al, 1976), ABOLOS (Saalfrank et al, 2001), COKCIO (Clegg & Sykes, 1984) and UFIQEF (Cadiou et al, 2002)] or between one Co atom and one other central metal atom (MOTQER; Arici et al, 2002). Structures with chain motifs are also well documented.…”

Synthesis, structure, and magnetic properties of dicopper and tricobalt complexes based on N-(2-pyridylmethyl)iminodiethanol

“…1 One of the tetradentate ligands that have pyridine, amine, and hydroxyl groups is N-(2-pyridylmethyl)iminodiethanol (H 2 pmide), an asymmetrical tripodal N 2 O 2 -type ligand. 4 The latter as an octamer possesses four manganese(II) and four manganese(III) ions and consists of three face-sharing cubes with manganese cations on alternate corners. The H 2 pmide ligand acts as a capping ligand as well as a bridging ligand through the deprotonation of the hydroxyl groups.…”