Bis[4-(4-bromophenylimino-κN)pent-2-en-2-olato-κO]copper(II).

In the title compound, [Cu(C(11)H(11)BrNO)(2)], the Cu(II) atom is in a distorted square-planar geometry, with the two bidentate ketimine ligands positioned in a trans geometry. Two inter-molecular C-H⋯O hydrogen bond inter-actions are present which link the mol-ecules in a zigzag manner along the a axis. The mol-ecules pack in layers along the diagonal of the bc plane.

2-Ethyl-3-hy-droxy-1-isopropyl-4-pyridone.

The title compound, C(10)H(15)NO(2), crystallized with three mol-ecules in the asymmetric unit. These three mol-ecules are quite similar except for slight differences in the torsion angles of the substituents on the ring. The isopropyl C-C-N-C torsion angles (towards the carbon next to the ethyl bound carbon), for example, are -150.63 (11), -126.77 (13) and -138.76 (11)° for mol-ecules A, B and C, respectively, and the C-C-C-N torsion angles involving the ethyl C atoms are 102.90 (13), 87.81 (14) and 86.47 (13)°. The main difference between the three mol-ecules lies in the way they are arranged in the solid-state structure. All three mol-ecules form dimers that are connected through strong O-H⋯O hydrogen bonds with R(2) (2)(10) graph-set motifs. The symmetry of the dimers formed does however differ between mol-ecules. Mol-ecules B connect with each other to form inversion dimers. Mol-ecules A and C, on the other hand, form dimers with local twofold symmetry, but the two mol-ecules are crystallographically distinct. The B and C molecules are linked to themselves and to each other via C-H⋯O hydrogen bonds. This results in the formation of a three-dimensional network structure.

[N,N'-Bis(4-chloro-phen-yl)pentane-2,4-diiminato]dicarbonyl-rhodium(I).

The title compound, [Rh(C(17)H(15)Cl(2)N(2))(CO)(2)], is a rhodium(I) derivative of a ß-diketiminato moiety. It is an example of a new type of ß-diketiminate derivative that has not yet been characterized via solid-state methods. The complex crystallizes with a distorted square-planar geometry about the Rh(I) atom (m symmetry). A weak inter-molecular C-H⋯O contact is observed.

(3,5,7-Tribromo-tropolonato-κO,O')tris-(triphenyl-phosphine-κP)silver(I).

The title compound, [Ag(C(7)H(2)Br(3)O(2))(C(18)H(15)P)(3)], a silver(I) derivative of 3,5,7-tribromo-tropolone, has three triphenyl-phosphine ligands coordinated to the silver centre, whereas the 3,5,7-tribromo-tropolonate anion coordinates as a bidentate ligand. The compound is an example of a five-coordinate silver complex containing a bidentate ligand.

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.