Divinyl sulfone cross-linked cyclodextrin-based polymeric materials: synthesis and applications as sorbents and encapsulating agents.

The aim of this study was to evaluate the crosslinking abilities of divinyl sulfone (DVS) for the preparation of novel water-insoluble cyclodextrin-based polymers (CDPs) capable of forming inclusion complexes with different guest molecules. Reaction of DVS with native α-cyclodextrin (α-CD), β-cyclodextrin (β-CD) and/or starch generates a variety of homo- and hetero-CDPs with different degrees of crosslinking as a function of the reactants' stoichiometric ratio. The novel materials were characterized by powder X-ray diffraction, electron microscopy and for their sorption of phenol and 4-nitrophenol.

Ethyl 4-(4-chloro-anilino)-1-(4-chloro-phen-yl)-2-methyl-5-oxo-2,5-di-hydro-1H-pyrrole-2-carboxyl-ate.

In the title compound, C20H18Cl2N2O3, the dihedral angles between the central 2,5-di-hydro-1H-pyrrole ring and the phenyl rings are 74.87 (9) and 29.09 (9)°.

Ethyl 4-anilino-2-methyl-5-oxo-1-phenyl-2,5-di-hydro-1H-pyrrole-2-carboxyl-ate.

In the title compound, C20H20N2O3, the central 2,5-di-hydro-1H-pyrrole ring [r.m.s.

N'-[(E)-Benzyl-idene]-2-(6-meth-oxy-naphthalen-2-yl)propano-hydrazide.

The title mol-ecule, C21H20N2O2, exists in the solid state in the 'extended' form. The crystal packing consists of ribbons of mol-ecules extending parallel to c and associated via N-H⋯O and weak C-H⋯O hydrogen bonds. C-H⋯π inter-actions are also present.

2-(5-Meth-oxy-2-methyl-1H-indol-3-yl)-N'-[(1E,2E)-3-phenyl-prop-2-en-1-yl-idene]acetohydrazide.

The title compound, C21H21N3O2, adopts a J-shaped conformation which appears to be at least partially directed by a weak intra-molecular C-H⋯N hydrogen bond. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds into R 2 (2)(8) and R 2 (2)(14) cyclic dimers, which form a chain running parallel to the b axis.

(4E)-4-[(2-Hy-droxy-anilino)methyl-idene]-1-phenyl-pyrazolidine-3,5-dione dimethyl sulfoxide hemisolvate.

The asymmetric unit of the title compound, C16H13N3O3·0.5C2H6OS, is composed of two independent pyrazolidine-3,5-dione mol-ecules and one dimethyl sulfoxide solvent mol-ecule. In each pyrazolidine-3,5-dione mol-ecule, an intra-molecular N-H⋯O hydrogen bond forms an S(5)S(6) motif.

Amino-[(1H-benzimidazol-2-yl)amino]-methaniminium 4-methyl-benzene-sulfonate.

The asymmetric unit of the title salt, C8H10N5 (+)·C7H7O3S(-), consists of two amino-[(1H-benzimidazol-2-yl)amino]-meth-an-im-inium cations and two 4-methyl-benzene-sulfonate anions. The cations are each stabilized by intra-molecular N-H⋯N hydrogen bonds between the free amino groups and the imine N atoms of the benzimidazole units, forming S(6) ring motifs. In the crystal, cations and anions are linked by N-H⋯O and C-H⋯O hydrogen bonds, forming a three-dimensional supra-molecular framework.

2-(4-Chloro-phen-yl)-4,5-diphenyl-1-(prop-2-en-1-yl)-1H-imidazole.

The title compound, C24H19ClN2, crystallizes with two independent mol-ecules in the asymmetric unit. The prop-2-enyl substituents on the imidazole rings adopt similar conformations in the two mol-ecules. The 4-and 5-substituted phenyl rings and the benzene ring make dihedral angles of 67.

5-Amino-3-anilino-1H-pyrazole-4-carbonitrile.

In the title compound, C(10)H(9)N(5), the phenyl ring is twisted with respect to the pyrazole ring, forming a dihedral angle of 24.00 (6)°. In the crystal, mol-ecules are linked by N-H⋯N hydrogen bonds into chains running parallel to [010] containing alternating R(2) (2)(6) and R(2) (2)(12) rings.

2-Anilino-5,7-dimethyl-pyrazolo-[1,5-a]pyrimidine-3-carbonitrile.

The title compound, C(15)H(13)N(5), crystallizes with two independent mol-ecules in the asymmetric unit. The mol-ecular conformations are stabilized by C-H⋯N contacts forming S(6) ring motifs. In the crystal, pairs of mol-ecules are connected into R(2) (2)(12) dimers by N-H⋯N hydrogen bonds.

(Z)-3-(2-Hy-droxy-eth-yl)-2-(phenyl-imino)-1,3-thia-zolidin-4-one.

In the title compound, C(11)H(12)N(2)O(2)S, the thia-zole and phenyl rings are inclined at 56.99 (6)° to one another. The thia-zole ring is planar with an r.

2-(1,3-Benzoxazol-2-yl)guanidinium chloride.

The non-H atoms of the cation of the title salt, C(8)H(9)N(4)O(+)·Cl(-), are approximately co-planar (r.m.s.

2-(1,3-Benzothia-zol-2-yl)guanidinium chloride.

The non-H atoms of the cation of the title salt, C(8)H(9)N(4)S(+)·Cl(-), are approximately co-planar (r.m.s.

N-(4,6-Dimethyl-pyrimidin-2-yl)-1,3-benzothia-zol-2-amine.

In the title compound, C(13)H(12)N(4)S, an amino N atom is connected to a 1,3-benzothia-zole fused-ring system and a dimethyl-substituted pyrimidine ring, these components being aligned [inter-planar dihedral angle = 1.9 (1)°]. The secondary amino N atom forms an inter-molecular N-H⋯N hydrogen bond to an N atom of the fused ring of an adjacent mol-ecule, generating a centrosymmetric cyclic hydrogen-bonded dimer [graph set R(2) (2)(8)].

2-(1,3-Benzothia-zol-2-yl)guanidin-2-ium acetate.

In the title compound, C(8)H(9)N(4)S(-)·C(2)H(3)O(2) (-), the cation is essentially planar (r.m.s deviation = 0.

2-Amino-4-phenyl-4H,10H-1,3,5-triazino[1,2-a]benzimidazol-3-ium chloride.

2-Guanidinobenzimidazole condenses with benzaldehyde in the presence of hydro-chloric acid to form 2-amino-3,4-dihydro-4-phenyl-1,3,5-triazino[1,2-a]benzimidazole, which was isolated as its hydro-chloride, C(15)H(14)N(5) (+)·Cl(-). The positive charge of the cation is formally placed on the double-bonded N atom of the dihydro-triazine ring. The six-membered dihydro-triazine that is fused with the benzimidazole ring system is relatively flat (r.

4-(4-Chloro-benz-yl)-5-methyl-2-phenyl-1H-pyrazol-3(2H)-one.

The five-membered ring of the title compound, C(17)H(15)ClN(2)O, is almost planar (r.m.s.

2-(1,3-Benzothia-zol-2-yl)guanidine.

In the title comound, C(8)H(8)N(4)S, one of the two independent mol-ecules is essentially planar (r.m.s.

N-(4,6-Dimethyl-pyrimidin-2-yl)-1H-benzimidazol-2-amine.

There are two independent mol-ecules in the asymmetric unit of the title compound, C(13)H(13)N(5). In each mol-ecule, an amino N atom is connected to a benzimidazole fused-ring system and a pyrimidine ring [these are aligned at 1.3 (1)° in one independent mol-ecule and at 5.