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The structure of the title compound, [Fe(C5H5)(C10H12N2)]I, consists of a 1-(ferrocen-1-ylmeth­yl)-3-methyl­imidazolium cation which is counter-balanced by an iodide anion. The cyclo­penta­dienyl (Cp) rings of the ferrocene unit have a slightly staggered conformation skewed from an ideal eclipsed conformation by an angle of 3.5 (6)°. The inter­planar angle between the Cp and the imidazole ring is 67.94 (2)°.

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In the title compound, [Ni(C9H12O2PS2)2], the NiII atom resides on an inversion center and is coordinated by four S atoms [Ni—S = 2.2328 (4) and 2.2455 (3) Å] in a distorted square-planar geometry [S—Ni—S = 88.443 (13) and 91.557 (13)°]. In the crystal, mol­ecules related by translation in [110] are linked into chains via weak C—H...O inter­actions. The crystal packing exhibits short inter­molecular S...S contacts of 3.3366 (5) Å.

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The title compound, [Ni(C11H16O2PS2)2], contains a four-coordinate NiII cation with an idealized square-planar geometry. The metal atom is surrounded by two chelating isobidentate dithio­phospho­nate ligands in a trans or anti configuration, binding through the S-donor atoms.

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The asymetric unit of the title compound, [Fe(C5H5)(C17H13N2)], contains two independent mol­ecules whose conformations differ, especially in the 4-{(pyridin-4-yl)methyl­idene]amino}­phenyl unit where one is flipped by almost 180°. The cyclo­penta­dienyl rings of the ferrocene unit also exhibit different staggered conformations: in one mol­ecule the conformation is staggered by 9.43 (2)° and in the other by 24.46 (1)° from an ideal eclipsed geometry. The plane of the benzene ring is tilted away from the ferrocene group in both mol­ecules, with dihedral angles of 6.97 (1) and 10.30 (2)°. The benzene ring is also slightly twisted from the plane of the pyridine ring, with dihedral angles of 5.98 (2) and 6.51 (2)° in the two mol­ecules.

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The title compound, C32H29NP2S2, has two mol­ecules in the asymmetric unit, with an r.m.s. difference of 0.218 Å in their best-fit overlay. Both mol­ecules have a slightly distorted trigonal–planar N atom, bonded to two PV atoms and a C atom of the 4-ethyl­phenyl unit. The P—N—P angles of 126.34 (11) and 125.98 (11)° are larger than the four C—N—P bond angles. The two S atoms are trans to one another with respect to the P—N—P angle. The crystal structure features C—H...π inter­actions. The methyl group in one of the mol­ecules is disordered over two sets of sites, with occupancies of 0.518 (6) and 0.482 (6).
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