Synthesis, structure, and magnetic properties of catena-(.mu.-oxo)(hemiporphyrazinato)iron(IV), the first polymeric .mu.-oxo-bridged complex of iron

Abstract

The crystal and molecular structure of the compound azZe/M-^-oxo)(hemiporphyrazinato)iron(IV), [FeON8C26H14]", has been determined from single-crystal, three-dimensional X-ray diffraction counter data. The compound crystallizes as blue-black needles in space group P2/n with Z = 2 and unit cell dimensions (at 210 K) a = 16.090 (3) k, b = 3.975 (2) Á, c = 16.070(3) Á, and ß = 92.97 (1)°. The structure was refined by full-matrix least-squares techniques to a conventional R value of 0.045. Distorted (hemiporphyrazinato)iron units stack along the b axis and are linked into polymeric, uniformly spaced, linear

One-dimensional coordination polymers: Applications to material science

“…These single-atom bridged polymers, doped by halogens or other inorganic [22] or organic acceptors [23], result in dramatic enhancements in electrical conductivity as well as in the appearance of the characteristic magnetic and optical signatures of a "molecular metal". The crystal structure of the oxo-bridged iron complex polymer [Fe(Hp)O], (HP= the dianion of hemiporphyrazine) was also reported [25], although doping does not lead to an increase in conductivity.…”

Transfer-Matrix Simulations of Linear Magnetic Systems

“…We have also analyzed a number of uniform and bond-alternating molecularbased chains: (a) the compound trαns-[Νi(333-tet)(μ-Ν 3 )]n(ClO4 ) n -denoted as 1 by [5] and abbreviated here as Al; (b) [FeOΝ8C26Η14]n -considered by [6] and abbreviated here as Α2; (c) the compounds 1 and 2 -considered by [7] and abbreviated here as Α3 and Α4, respectively; (d) [Νi(Ν3)2(tmeda)]n -considered by [8] and abbreviated here as A5; (e) Νi2(ΕDTΑ) • 6Η2O considered by [9] and abbreviated here as Α6. It is worth noting that for A6, both the experimental susceptibility and the magnetic specific heat data are reported [9].…”

“…These compounds are characterized not only by uniform antiferromagnetic but also non-uniform alternating-bond interaction [5][6][7][8][9].…”

Synthesis and structure of [hemiporphyrazinato(2–)bis(1-methylimidazole)cobalt(III)] triiodide

“…Moreover, such an interpretation is supported by: (i) the short C(6)---N(4) [1.286 (8) (Iimura, Sakurai & Yamamoto, 1988); (iii) the ConI--N(pyridine) distance, much longer than the normal value of 1.91 (1)A, found for example in [(r/5-CsHs)ColNCsH4--C(CH3~N -CH(CH3)(C6Hs)]+.I - (Bernal, Riesner, Brunner & Riepl, 1985). Hiller et al (1984)], suggesting an interaction between the empty dx2_y2metal orbital and the nitrogen lone pair of the hp ligand (Attanasio et al, 1985). Another point of interest in this structure is the planarity of the hemiporphyrazinato-Co m group (mean deviation from plane 0.022/~); the maximum deviation is for the C(4) atom (-0.057 A).…”

“…This asymmetry is also caused by the interruption of the ~-conjugation in the hp ligand that enhances the isoindole nitrogen basicity (Bossa, Cauletti, Grandinetti & Nota, 1987;Hiller, Strahle, Datz, Hanack, Hatfield, ter Haar & Gutlich, 1984). Moreover, such an interpretation is supported by: (i) the short C(6)---N(4) [1.286 (8) (Iimura, Sakurai & Yamamoto, 1988); (iii) the ConI--N(pyridine) distance, much longer than the normal value of 1.91 (1)A, found for example in [(r/5-CsHs)ColNCsH4--C(CH3~N -CH(CH3)(C6Hs)]+.I - (Bernal, Riesner, Brunner & Riepl, 1985).…”