organic compounds
In the title compound, C20H30O2, one of the two crystallographically independent molecules lies across a centre of inversion and the other resides in a general position (Z′ = 1.5). The supramolecular structure exists as an unusual two-dimensional network incorporating centrosymmetric hexameric hydrogen-bonded alcohol (OH)6 clusters [OO = 2.6637 (12)–2.6993 (12) Å] as the net nodes. The hexamers adopt a chair conformation [OOO = 106.55 (4)–115.81 (4)°] and are connected into a network with a square-grid topology (44) by a combination of single and double 1,1′-biadamantanediyl links. The bulky aliphatic groups appear to require specific hexagonal packing and so generate distinct noncovalent hydrophobic layers, which are essential for the stabilization of the hexameric alcohol array rather than the formation of the more commonly encountered tetramer-based arrays.
metal-organic compounds
New complexes containing the 1,4-bis(pyridazin-4-yl)benzene ligand, namely diaquatetrakis[1,4-bis(pyridazin-4-yl)benzene-N2]cadmium(II) hexaiodidodicadmate(II), [Cd(C14H10N4)4(H2O)2][Cd2I6], (I), and poly[[-1,4-bis(pyridazin-4-yl)benzene-2N2:N2']bis(-thiocyanato-2N:S)cadmium(II)], [Cd(NCS)2(C14H10N4)]n, (II), demonstrate the adaptability of the coordination geometries towards the demands of slipped - stacking interactions between the extended organic ligands. In (I), the discrete cationic [Cd-N = 2.408 (3) and 2.413 (3) Å] and anionic [Cd-I = 2.709 (2)-3.1201 (14) Å] entities are situated across centres of inversion. The cations associate via complementary O-HN2' hydrogen bonding [ON = 2.748 (4) and 2.765 (4) Å] and extensive triple - stacking interactions between pairs of pyridazine and phenylene rings [centroid-centroid distances (CCD) = 3.782 (4)-4.286 (3) Å] to yield two-dimensional square nets. The [Cd2I6]2- anions reside in channels generated by packing of successive nets. In (II), the CdII cation lies on a centre of inversion and the ligand is situated across a centre of inversion. A two-dimensional coordination array is formed by crosslinking of linear [Cd(-NCS)2]n chains [Cd-N = 2.3004 (14) Å and Cd-S = 2.7804 (5) Å] with N2:N2'-bidentate organic bridges [Cd-N = 2.3893 (12) Å], which generate - stacks by double-slipped interactions between phenylene and pyridazine rings [CCD = 3.721 (2) Å].
metal-organic compounds
In poly[[bis(μ-4,4′-bi-1H-pyrazole-κ2N2:N2′)bis(3-carboxyadamantane-1-carboxylato-κO1)cobalt(II)] dihydrate], {[Co(C12H15O4)2(C6H6N4)2]·2H2O}n, (I), the Co2+ cation lies on an inversion centre and the 4,4′-bipyrazole (4,4′-bpz) ligands are also situated across centres of inversion. In its non-isomorphous cadmium analogue, {[Cd(C12H15O4)2(C6H6N4)2]·2H2O}n, (II), the Cd2+ cation lies on a twofold axis. In both compounds, the metal cations adopt an octahedral coordination, with four pyrazole N atoms in the equatorial plane [Co—N = 2.156 (2) and 2.162 (2) Å; Cd—N = 2.298 (2) and 2.321 (2) Å] and two axial carboxylate O atoms [Co—O = 2.1547 (18) Å and Cd—O = 2.347 (2) Å]. In both structures, interligand hydrogen bonding [NO = 2.682 (3)–2.819 (3) Å] is essential for stabilization of the MN4O2 environment with its unusually high (for bulky adamantanecarboxylates) number of coordinated N-donor co-ligands. The compounds adopt two-dimensional coordination connectivities and exist as square-grid [M(4,4′-bpz)2]n networks accommodating monodentate carboxylate ligands. The interlayer linkage is provided by hydrogen bonds from the carboxylic acid groups via the solvent water molecules [OO = 2.565 (3) and 2.616 (3) Å] to the carboxylate groups in the next layer [OO = 2.717 (3)–2.841 (3) Å], thereby extending the structures in the third dimension.
metal-organic compounds
Double nitrileπ interactions are relevant for the crystal packing of charge-diffuse conjugated tetracyanopropenide anions when combined with common heteroaromatic tris-chelate octahedral complexes, [Fe(phen)3]2−.