{2-[(3,5-Dimethyl-2H-pyrrol-2-yl-idene-κN)(4-nitro-phen-yl)meth-yl]-3,5-dimethyl-1H-pyrrol-1-ido-κN}difluoridoboron.

In an effort to discover novel and potential boron-dipyrromethene (BODIPY) dyes, the title compound, C(19)H(18)BF(2)N(3)O(2), was prepared from 2,4-dimethyl-pyrrole, 4-nitro-benzaldehyde and BF(3)·Et(2)O in a one-pot reaction. There are two independent mol-ecules, A and B, in the asymmetric unit in which the dihedral angles between the benzene ring and boron-dipyrromethene mean plane have significantly different values [82.71 (8)° for mol-ecule A and 73.16 (8)° for mol-ecule B]. Inter-molecular C-H⋯π inter-actions help to stabilize the crystal structure.

Poly[[diaqua-(µ(2)-1,4-dioxane-κO:O')(µ(2)-2,3,5,6-tetra-fluoro-benzene-1,4-dicarboxyl-ato-κO:O)copper(II)] 1,4-dioxane disolvate dihydrate].

In the title complex, {[Cu(C(8)F(4)O(4))(C(4)H(8)O(2))(H(2)O)(2)]·2C(4)H(8)O(2)·2H(2)O}(n), the Cu(II) ion is six-coordinated by two oxygen donors from two trans 2,3,5,6-tetra-fluoro-1,4-dicarboxyl-ate (BDC-F(4)) ligands, two O atoms from two chair 1,4-dioxane ligands and two O atoms from two terminal water mol-ecules, adopting a distorted octa-hedral coordinated geometry. Each BDC-F(4) anion bridges two Cu(II) ions in a bis-monodentate fashion, forming a [Cu(BDC-F(4))](n) chain. These chains are further linked by bridging 1,4-dioxane ligands, generating a two-dimensional net with approximately recta-ngular grids of 11.253 × 7.654 Å. Such adjacent parallel layers are connected by O-H⋯O hydrogen bonds between guest water mol-ecules and the uncoordinated carboxyl-ate O atoms and coordinated water mol-ecules into the final three-dimensional supra-molecular network.

Redetermination of 2,4'-methyl-ene-diphenol.

In the previous determination [Finn & Musti (1950 ▶). J. Soc. Chem. Ind. (London), 69, S849] of the title compound, C(13)H(12)O(2), the three-dimensional coordinates and displacement parameters were not reported. This redetermination at room temperature reveals that the dihedral angle between the benzene rings is 79.73 (6)°. In the crystal, inter-molecular O-H⋯O hydrogen bonds between adjacent mol-ecules result in two-dimensional wave-like supra-molecular motifs parallel to the ab plane.

1,4-Bis(2-pyridylmethyl-eneamino-meth-yl)benzene.

The asymmetric unit of the centrosymmetric title compound, C(20)H(18)N(4), contains one half-mol-ecule. The pyridine and benzene rings are oriented at a dihedral angle of 77.21 (7)°.