Binary charge-transfer complexes using pyromellitic acid dianhydride featuring C-H⋯O hydrogen bonds.

Four binary charge-transfer complexes were made using pyromellitic acid dianhydride (pmda), those being pmda-naphthalene (1/1), C10H2O6·C10H8, (I), pmda-fluoranthene (1/1), C10H2O6·C16H10, (II), pmda-9-methyl-anthracene (1/1), C10H2O6·C15H12, (III), and pmda-ethyl anthracene-9-carboxyl-ate (1/2), C10H2O6·2C17H12O3, (IV). All charge-transfer complexes show alternating donor and acceptor stacks, which have weak C-H⋯O hydrogen bonds connecting the donor and acceptor mol-ecules. In addition, complex (I) has Z' = 1/2, complex (II) has a Z' = 2 and complex (IV) has half mol-ecule of pyromellitic acid dianhydride in the asymmetric unit.

Crystal structure of 5-[2-(2,4,6-tri-bromo-phen-yl)diazen-yl]tropolone.

The title compound {systematic name: 2-hy-droxy-5-[2-(2,4,6-tri-bromo-phen-yl)diazen-1-yl]cyclo-hepta-2,4,6-trien-1-one}, C13H7Br3N2O2, is essentially planar, with an r.m.s. deviation of 0.054 Å. The mol-ecular structure is fixed in the azo tautomer by intra-molecular C-H⋯N inter-actions, with O-H⋯O hydrogen bonds creating linked dimers. Charge-transfer inter-actions are observed, with the segregated stacks linked by Br⋯Br inter-actions.

Ethyl (2Z)-3-hy-droxy-3-(4-nitro-phen-yl)prop-2-enoate.

The title compound, C11H11NO5, is essentially planar, with an r.m.s. deviation of 0.06 Å. The mol-ecular structure is stabilized by an intra-molecular O-H⋯O hydrogen bond. In the crystal, molecules are linked by two pairs of C-H⋯O hydrogen bonds, forming sheets, lying parallel to (101), which enclose R 4 (4)(26) ring motifs.

Electronic influence of ß-diketonato-type ligands on the coordination of 1,5-cyclooctadiene to palladium(II) as defined by 'Venus fly trap' geometric parameters.

A range of single-crystal structures of the type [Pd(cod)(LL'-Bid)]A, where LL'-Bid = acetylacetonato (acac), thenoyltrifluoroactetonato (thtfac) and hexafluoroacetylacetonato (hfacac), and A = tetrafluoroborate (BF(4)(-)) and hexafluorophosphate (PF(6)(-)), are reported. The complexes [Pd(cod)(acac)]PF(6) (I), [Pd(cod)(thtfac)]PF(6) (III), [Pd(cod)(thtfac)]BF(4) (IV) and [Pd(cod)(hfacac)]PF(6) (V) are isostructural in the monoclinic space group P2(1)/c. The influence of the variation of the ß-diketonato-type ligands on the coordination geometry of cis,cis-1,5-cycloocta-1,5-diene (cod) was investigated and found that no significant changes to the Pd-C and C=C bond distances were observed. The `Venus fly trap' parameters vary by 7.8° for the 'jaw' angle (ψ), while the `bite' angle (χ) remains virtually constant.

Methyl 2-amino-4,5-di-meth-oxy-benzoate.

The title compound, C10H13NO4, is essentially planar, with an r.m.s. deviation of 0.049 Å. An intra-molecular C-H⋯O hydrogen bond occurs and the amino group forms an intra-molecular N-H⋯Oester hydrogen bond; the other H atom forms an inter-molecular N-H⋯Ocarbon-yl hydrogen bond, leading to the formation of a helical chain that runs along the b-axis direction.

1-(3-Benzyl-4,6-dibenz-yloxy-2-hy-droxy-phen-yl)ethanone.

The title compound, C(29)H(26)O(4), is essentially planar in the acetophenone portion that includes both the hy-droxy and a benz-yloxy O atoms, with an r.m.s. deviation of 0.0311 Å. The other two substituents inter-sect the plane at 70.45 (3) and 59.55 (4)°. In the molecule there is an intramolecular O-H⋯O hydrogen bond. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds, as well as C-H⋯π and π-stacking inter-actions, with centroid-centroid distances 3.6570 (2) Å.

5-(Phenyl-diazen-yl)tropolone.

THE TITLE COMPOUND [SYSTEMATIC NAME: (E)-2-hy-droxy-5-(phenyl-diazen-yl)cyclo-hepta-2,4,6-trien-1-one], C(13)H(10)N(2)O(2), is essentially planar with an r.m.s. deviation of 0.036 (2) Šand a dihedral angle of 1.57 (8)° between the phenyl and tropolone rings. In the crystal, mol-ecules are linked by pairs of O-H⋯O hydrogen bonds into inversion dimers. The dimers are further connected by C-H⋯O hydrogen bonds and π-π stacking inter-actions, with centroid-centroid distances of 3.6934 (9) and 3.6282 (9) Å.

1-(2-Meth-oxy-phen-yl)-2-{[2-(2-meth-oxy-phen-yl)hydrazinyl-idene](nitro)-meth-yl}diazene.

In the title compound, C(15)H(15)N(5)O(4), a nitro-formazan derivative, the formazan unit is essentially planar with an r.m.s. deviation of 0.0204 (6) Šand adopts a closed syn,s-cis configuration with an intra-molecular N-H⋯N hydrogen bond. The formazan plane makes dihedral angles of 4.32 (5) and 24.35 (5)° with the benzene rings. The dihedral angle between the formazan plane and the nitro group is 12.58 (8)°. In the crystal, C-H⋯O inter-actions connect the mol-ecules into an inversion dimer.

Bis(diphenyl-p-tolyl-phosphane-κP)(2-hy-droxy-3,5,7-bromo-cyclo-hepta-2,4,6-trienonato-κ(2)O,O')copper(I).

The Cu(I) atom in the title compund, [Cu(C(7)H(2)Br(3)O(2))(C(19)H(17)P)(2)], is located on a twofold rotation axis; the 3,5,7-tribromo-tropolonate anion coordinates as a bidentate ligand with a bite angle of 76.42 (9)°. An intra-molecular C-H⋯O inter-action occurs. Within the crystal, extensive weak C-H⋯π inter-actions contribute to the herringbone pattern observed in the packing of the mol-ecules.

(Nitrato-κO)tris-[tris-(4-fluoro-phen-yl)phosphane-κP]copper(I).

In the title complex, [Cu(NO(3))(C(18)H(12)F(3)P)(3)], the ligating atoms define a distorted tetrahedon with the three tris-(4-fluoro-phen-yl)phosphane ligands in the basal positions and the nitrate ligand in the axial position. The intra-molecular π-π inter-action [centroid-centroid distance = 3.6113 (11) Å] between two of the 4-fluoro-phenyl groups is complemented by both C-H⋯F and C-H⋯O inter-actions with distances in the range 2.51-2.60 Å, resulting in a tight head-to-tail packing.

Bis(triphenyl-phosphine-κP)(tropolonato-κO,O')silver(I) dichloro-methane solvate.

The title compound, [Ag(C(7)H(5)O(2))(C(18)H(15)P)(2)]·CH(2)Cl(2), crystallizes with a distorted tetra-hedral geometry about the Ag(I) atom, defined by two O atoms from one tropolonate ligand and two P atoms from two triphenyl-phosphine ligands. It is an example of a new type of tropolone derivative that has not been characterized via solid-state methods.

Dicarbon-yl[2-hydr-oxy-3,5,7-tris-(mor-pho-linomethyl)cyclo-hepta-2,4,6-trien-onato(1-)-κO,O]rhodium(I).

In the title compound, [Rh(C(22)H(32)N(3)O(5))(CO)(2)], the Rh(I) atom is coordinated by two carbonyl ligands and two tropolonate O atoms in a distorted square-planar geometry. It is an example of a new type of tropolone derivative that has not been characterized via solid-state methods. Weak intra-molecular C-H⋯N and inter-molecular C-H⋯O hydrogen bonds, and π-π stacking inter-actions between the tropolone rings [centroid-centroid distance = 3.590 (8) Å] are observed in the crystal structure.