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Crystal structure and spectroscopy of the low-spin iron(II) compound: tris(bipyrimidine)iron(II) bis(triflate), [Fe(bipym)33](CF3SO3)2 (2000)

van Albada, Gerard A. ; Smeets, Wilberth J.J. ; Spek, Anthony L. ; [et al.]

Springer

Journal of chemical crystallography 30 (2000), S. 441-444

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ISSN: 1572-8854

Keywords: 2,2′-Bipyrimidine ; low-spin ; iron ; crystal structure ; infrared

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract The compound [Fe(bipym)33](CF3SO3)2 (in which bipym = 2,2′-bipyrimidine) crystallizes in the space group P21/c, with a = 13.7641(11), b = 18.7557(19), c = 12.3627(11) Å, β = 103.085(8)° and Z = 4. The low-spin Fe(II) atom is octahedrally surrounded by six nitrogen atoms of three bipyrimidine groups with Fe—N distances that vary from 1.968(4) to 1.975(4) å. In the far-infrared region the Fe—N vibrations are observed at 359 and 372 cm-1.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1011339214337

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Synthesis, spectroscopy, and X-ray structure of the polymer catena-[bis(azido-N)-copper(II)-μ-bis(2-benzimidazolyl)butane] (2000)

van Albada, Gerard A. ; Veldman, Nora ; Spek, Anthony L. ; [et al.]

Springer

Journal of chemical crystallography 30 (2000), S. 69-72

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ISSN: 1572-8854

Keywords: azido ; crystal structure ; copper(II) ; infrared ; polymeric

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract The title compound, catena-[bis(azido-N)-copper(II)-μ(bis(2-benzimidazolyl)butane), [Cu(C18H18N4)(N3)2]n, was obtained from the reaction of the ligand bis(2-benzimidazolyl)butane and Cu(N3)2. The x-ray crystal structure is reported. The compound crystallizes in the monoclinic space group P21/c with a = 8.2524(10), b = 12.765(5), c = 9.1125(15) Å, β = 106.423(12)°, Z = 2. The Cu(II) ions are square-planar coordinated with trans-oriented end-on binding azido ligands. The structure is a polynuclear chain with the benzimidazole bridging at each end. In addition a N(ligand)-H···N(azido) H-bridge [N(ligand)···N(azido) = 2.994(7) Å] is present, resulting in a pseudo 2-dimensional lattice. The characteristic azido infrared vibrations are found at 2060 and 2077 cm−1 (νas(N3)) and 1284 and 1297 cm−1 (ν(N3)).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009506418398

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Crystal structure and spectroscopy of bis-[bis(2-benzimidazolyl)propane]copper(II) bis(triflate)monohydrate, a copper complex with a geometry intermediate between tetrahedral and square planar (2000)

van Albada, Gerard A. ; Riggio, Ivonne ; Mutikainen, Ilpo ; [et al.]

Springer

Journal of chemical crystallography 30 (2000), S. 793-797

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ISSN: 1572-8854

Keywords: copper ; bis(benzimidazoles) ; crystal structure ; infrared

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract The structure of a mononuclear copper(II) compound with the ligand bis(2-benzimidazolyl)propane (abbreviated as tbz) is reported. The compound [Cu(tbz)2](CF3SO3)2(H2O) crystallizes in the triclinic space group P $$\bar 1$$ , with a = 12.363(6), b = 13.218(9), c = 15.365(8) Å, α = 82.74(5), β = 68.04(4), γ = 65.30(5), and Z = 2. The Cu(II) atom has a geometry intermediate between tetrahedral and square planar, consisting of four nitrogen atoms of two tbz ligands. The Cu—N—Cu angles are about 135°, while the dihedral angle between them amounts to 62° (0° for square planar and 90° for a tetrahedron). Ligand field bands are observed at 10.2 × 103, 13.8 × 103, and 20.3 × 103 cm−1, while the most characteristic infrared vibrations of the triflate anion are observed at 1273, 1260, 1238, 1221, 1171, and 1157 cm−1.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1013276325343

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