A second polymorph of cyclo-tetra­kis­{μ₂-[(dimethyl­amino)meth­yl]phen­yl-κ³C²:C²,N}copper tetra­hydro­furan solvate

The structure of the title compound, [Cu₄(C₉H₁₂N)₄]·C₄H₈O, has previously been reported in the monoclinic space group C2/c. We report here the structure of a second polymorph which crystallizes in the orthorhombic space group P2₁2₁2₁. The copper complex is located at a general position but exhibits local S₄ symmetry.

Dichloro­(di-2-pyridylamine)zinc(II): a redetermination at 110 K

The title compound, [ZnCl₂(C₁₀H₉N₃)], has been investigated at 110 K. In contrast with the previously published room-temperature structure [Ho et al. (1999). J. Chem. Soc. Dalton Trans. pp. 1581-1586], the amine N atom is found to have a symmetrical planar environment. The two independent Zn-Cl distances are significantly different, but the difference of 0.0414 (3) Å is within the range found in other tetra­hedral ZnCl₂ complexes.

2-(2,4-Dimethyl­phen­yl)-4-isoprop­yl-1-methyl­isoquinolinium hexa­fluoro­phosphate

The title compound, C₂₁H₂₄N⁺·PF₆⁻, crystallizes in centrosymmetric hydrogen-bonded clusters consisting of two cations and two anions, via weak aromatic C—H...F inter­actions. The isoquinolinium and dimethyl­phen­yl moieties are not coplanar.

5-Acet­oxy-1-acet­yl-3-pyrrolin-2-one

The chiral title compound, C₈H₉NO₄, crystallizes in the non-centrosymmetric space group P2₁2₁2₁, but in the absence of an atom with significant anomalous dispersion, the absolute configuration could not be determined. The H atoms in both meth­yl groups are eclipsed with respect to the C=O bond. The structure features weak C—H...O inter­actions that link the mol­ecules into a three-dimensional network.

1,3-Bis(3,5-dimethyl­phen­oxy)propane

The mol­ecular structure of the title compound, C₁₉H₂₄O₂, exhibits great similarity to that of the previously published non-derivatized mol­ecule, the greatest difference being seen in the central torsion angles and ring orientations. The structure additionally features a π–π stacking inter­action and a weak C—H...π inter­action.

trans-Dichloro­bis(tris­{4-[(dimethyl­amino)meth­yl]phen­yl}phosphine)platinum(II)

Crystals of the title compound, [PtCl₂(C₂₇H₃₆N₃P)₂], as the trans-isomer were obtained from the originally formed cis-isomer after standing for more than four months in solution. In the crystal structure, the Pt atom is located on an inversion centre, which makes the mol­ecular structure similar to the triphenyl­phosphine analogue. The amino groups are pyramidal and do not inter­act with Pt atoms or hydrogen-bond donors.