Piotr Kuś

Tetraphenylporphyrins monosubstituted with glycerol diester units. Synthesis and characterization

SummaryA novel 1-monoglyceryl ether of 5-(4-hydroxyphenyl)-10,15,20-tritolylporphyrin and related diacid esters with very high solubility in hydrophobic solvents were synthesized.ZusammenfassungEs wurde ein neuer 1-Monoglycerylether von 5-(4-Hydroxyphenyl)-10,15,20-tritolylporphyrin und verwandte Disäuren-ester mit hoher Löslichkeit in hydrophoben Lösungsmitteln synthetisiert.

Secondary interactions in two related terphenyl derivatives: 2',5'-dimethyl-p-terphenyl and 2',5'-bis(bromomethyl)-p-terphenyl.

In 2,5-dimethyl-p-terphenyl, C20H18, which displays pseudosymmetry (the true space group is Pna2(1), but less satisfactory refinement can also be achieved in Pbcn), the molecules are linked into chains by two short C-H...pi interactions to the centroid of the central ring. In 2,5-bis(bromomethyl)-p-terphenyl, C20H16Br2, the polar CH2Br groups cause molecules to aggregate via C-H...Br and Br...Br interactions, forming a layer structure, in which the phenyl rings project outwards from the central, more polar, region.

Two polymorphs of N,N'-diphenethyl-terephthalamide

The title compound, C(24)H(24)N(2)O(2), crystallizes as a triclinic polymorph from dimethylformamide and a monoclinic polymorph from ethanol. In both forms, the molecule displays crystallographic inversion symmetry, and the packing involves translationally related ladders of molecules connected by N-H...O=C hydrogen bonds. Differences between the structures can be rationalized in terms of weak C-H...O contacts. Powder and differential scanning calorimetry investigations of new samples gave no evidence for the triclinic form, and it seems to represent a disappearing polymorph.

Two concomitant polymorphs of N,N'-bis[4-(diethylamino)phenyl]terephthaldiamide.

The title compound, C(28)H(34)N(4)O(2), crystallizes simultaneously as a monoclinic, (Im), and a (twinned) triclinic polymorph, (It), from d(6)-dimethyl sulfoxide. Polymorph (It) (P-1, Z = 1) displays the standard ;ladder packing for this group of compounds, with neighbouring inversion-symmetric molecules related by translation and connected by hydrogen bonds of the form N-H...O=C. Polymorph (Im) (Cc, Z = 4) has no imposed symmetry; there are three independent hydrogen bonds, one classical N-H...O=C and a bifurcated system with N-H...O=C augmented by a short C-H...O=C interaction. Each molecule is thereby linked to four neighbouring molecules, two lower and two higher, so that a crosslinked three-dimensional pattern is formed rather than the standard ladder.

2,5,2′′,5′′-Tetra­meth­yl-p-terphen­yl

The title compound, C22H22, displays no crystallographic symmetry. The central benzene ring subtends interxadplanar angles of 63.00u2005(6) and 66.09u2005(6)° (in opposite senses) to the outer rings. The crystal packing involves two short C—H⋯π contacts.

2,2′′-Bis(bromo­meth­yl)-p-terphen­yl

The molxadecule of the title compound, C20H16Br2, displays crystallographic inversion symmetry. Two C—H⋯Br interxadactions link the molxadecules into layers parallel to (overline{1}11). The shortest Br⋯Br contact is 4.1599u2005(4)u2005A.

N-Cyclo­hexyl-4-(methoxy­carbonyl)­benz­amide

The title compound, methyl 4-(cycloxadhexylxadaminoxadcarbonyl)xadbenzoate, C15H19NO3, crystallizes with two independent molxadecules in the asymmetric unit, which differ in their ring orientations. The molxadecules are connected by N—H⋯O=C hydrogen bonds to form chains parallel to the a axis.

Tetraphenylporphyrins monosubstituted with a crown ether in one phenyl ring. Synthesis and characterization

SummaryThe synthesis and spectroscopic characterization of seven new tetraphenyl-porphyrins (1–7) derivatized with 12-crown-4, 14-crown-4, 15-crown-5, or 18-crown-6 ether units inortho orpara position of one of the phenyl rings is described.ZusammenfassungDie Synthese und die spektroskopische Charakterisierung sieben neuer Tetraphenylporphyrine (1–7), die mit 12-Krone-4, 14-Krone-4, 15-Krone-5 oder 18-Krone-6 in derortho-oderpara-Position eines Phenylrings substituiert sind, werden beschrieben.

A new polymorph of 1,4-dibromo-2,5-dimethyl­benzene: H⋯Br and Br⋯π versus Br⋯Br inter­actions

A new polymorph, (Ib), of the title compound, C(8)H(8)Br(2), crystallizes in the space group P2(1)/n, the same as the known polymorph (Ia) but with Z = 2 (imposed inversion symmetry) rather than Z = 4. The molecular structures are closely similar because the molecule has no degrees of torsional freedom except for methyl groups, but the packing arrangements are completely different. Polymorph (Ia) is characterized by linked trapezia of Br···Br interactions, whereas polymorph (Ib) features H···Br and Br···π interactions.

1,6,7-Tris­(bromo­methyl)­naphthalene

The title compound, C13H11Br3, has a planar framework of C atoms with no distortion towards helicity. The two adjacent bromine substituents point to opposite sides of the ring system. Two bromine–bromine contacts, with distances less than twice the van der Waals radius, link the molxadecules to form ribbons parallel to the a axis. Weak C—H⋯Br hydrogen bonds and partial ring stacking complete the crystal packing.