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3,3'-Di-n-butyl-1,1'-(p-phenyl-ene-dimethyl-ene)diimidazolium bis-(hexa-fluoro-phosphate).

ABSTRACT: The asymmetric unit of the title N-heterocyclic carbene compound, C(22)H(32)N(4) (2+)·2PF(6) (-), consists of one half of the N-heterocyclic carbene dication and one hexa-fluoro-phosphate anion. The dication lies across a crystallographic inversion center. The imidazole ring is twisted away from the central benzene ring, making a dihedral angle of 76.23 (6)°. The hexa-fluoro-phosphate anions link the cations into a three-dimensional network via inter-molecular C-H⋯F hydrogen bonds. A weak C-H⋯π inter-action further stabilizes the crystal structure.

SUBMITTER: Haque RA

PROVIDER: S-EPMC2983963 | biostudies-literature |

REPOSITORIES: biostudies-literature

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3,3'-Dimethyl-1,1'-(methyl-enedi-p-phenyl-ene)diimidazolium bis-(hexa-fluoro-phosphate).

Project description:The title N-heterocyclic carbene compound, C(21)H(22)N(4) (2+)·2PF(6) (-), crystallizes as an inversion twin. There are two independent N-heterocyclic carbene dications (A and B) and four independent hexa-fluoro-phosphate anions in the asymmetric unit. The cations are L-shaped with the benzene rings being inclined to one another by 88.82 (16)° in cation A and 87.03 (16)° in cation B. The imidazole rings make dihedral angles of 35.7 (2) and 32.83 (18)° with the attached benzene rings in cation A, and 30.14 (19) and 31.96 (18)° in cation B. In the crystal, the cations are linked via C-H⋯F hydrogen bonds, forming a three-dimensional network. π-π inter-actions involving the benzene and imidazole rings [centroid-centroid distances = 3.602 (2) and 3.723 (2) Å] and C-H⋯π inter-actions are also present.

| S-EPMC3007944 | biostudies-literature

3,3'-Dimethyl-1,1'-[(1,3-dihy-droxy-propane-2,2-di-yl)dimethyl-idene]diimidazolium bis-(hexa-fluoro-phosphate).

Project description:The title compound, C(13)H(22)N(4)O(2) (2+)·2PF(6) (-), was prepared by the anion exchange of the dibromide ionic liquid with potassium hexa-fluoro-phosphate. The two imidazole rings are each planar (r.m.s. deviations = 0.0016 and 0.0060?Å) and make a dihedral angle of 45.3?(18)°. Intra-molecular O-H?F hydrogen bonds occur. Inter-molecular C-H?F, O-H?O and C-H?O hydrogen bonds stabilize the crystal structure.

| S-EPMC3011425 | biostudies-literature

3,3'-Diethyl-1,1'-(1,4-phenyl-ene-dimethyl-ene)diimidazol-3-ium bis-(hexa-fluoro-phosphate).

Project description:In the title mol-ecular salt, C(18)H(24)N(4) (2+)·2PF(6) (-), the complete dication is generated by a crystallographic inversion centre. The central benzene ring makes a dihedral angle of 77.19?(9)° with each of the imidazole rings. In the crystal, C-H?F inter-actions link the cations and anions into layers lying parallel to the bc plane. The hexa-fluoro-phosphate anion is disordered over two sets of sites in a 0.520?(11):0.480?(11) ratio.

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3,3'-Dimethyl-1,1'-ethyl-ene-diimidazolium dibromide.

Project description:The title compound, C(10)H(16)Br(2)N(4), was synthesized by the reaction of 1-methyl-imidazole and 1,2-dibromo-ethane in toluene. The complete dication is generated by a crystallographic inversion centre situated at the mid-point of the ethane C-C bond. In the crystal structure, weak inter-molecular C-H?Br inter-actions link the mol-ecules into chains along the b axis and an intramolecular C-H?Br close contact is also present.

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3,3'-Dimethyl-1,1'-methyl-ene-diimidazolium dibromide.

Project description:In the crystal structure of the title compound, C(9)H(14)N(4) (2+)·2Br(-), the cation and anions have crystallographic mirror symmetry, with the mirror plane running through the central CH(2) group for the cation. The latter are stacked along the a axis, forming channels hosting the bromide anions. The crystal packing is stabilized by C-H?Br hydrogen-bonding inter-actions, generating a two-dimensional network.

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3,3'-Dimethyl-1,1'-(butane-1,4-di-yl)diimidazolium bis-(tetra-fluoro-borate).

Project description:The title compound, C(12)H(20)N(4) (2+)·2BF(4) (-), was prepared by the anion exchange of a dibromide ionic liquid with sodium tetra-fluoro-borate. The asymmetric unit contains one half of the imidazolium cation, which lies about an inversion centre at the mid-point of the central C-C bond of the linking butyl chain. The two planar imidazole rings (r.m.s. deviation = 0.0013?Å) are strictly parallel and separated by 2.625?(7)?Å [vertical distance between the centroids of two imidazole rings], giving the mol-ecule a stepped appearance. In the crystal structure, inter-molecular C-H?F hydrogen bonds link the cations and anions, generating a three-dimensional network.

| S-EPMC2979393 | biostudies-literature

3,3'-Di-n-propyl-1,1'-(1,3-phenyl-ene-dimethyl-ene)di(1H-imidazol-3-ium) bis-(hexa-fluorophosphate).

Project description:In the title compound, C(20)H(28)N(4) (2+)·2PF(6) (-), the dihedral angles between the benzene ring and the imidazole rings are 70.18 (11) and 69.83 (11)°, while the imidazole rings form a dihedral angle of 40.52 (12)°. In the crystal, weak C-H⋯F inter-actions link the mol-ecules into a two-dimensional network parallel to (001). A π-π inter-action with a centroid-centroid distance of 3.601 (1) Å is also observed in the crystal structure.

| S-EPMC3393961 | biostudies-literature

3,3'-Di-tert-butyl-1,1'-[1,3-phenyl-enebis(methyl-ene)]diurea.

Project description:The title compound, C(18)H(30)N(4)O(2), contains two tert-butyl urea groups, each connected to a benzene ring though a methyl-ene group. One of the groups occupies a position almost normal to the aromatic plane with a C-N-C-C torsion angle of -94.4?(4)°, while the other is considerably twisted from the ring with a C-N-C-C torsion angle of -136.1?(4)°. In the crystal, pairs of mol-ecules are connected to each other, forming centrosymmetric dimers in which two NH groups of one mol-ecule act as hydrogen-bond donors to one carbonyl O atom of the other mol-ecule. The dimers are linked into sheets parallel to (100) by N-H?O hydrogen bonds involving the remaining N-H and C=O groups.

| S-EPMC2983681 | biostudies-literature

3,3'-Di-n-propyl-1,1'-[p-phenyl-enebis(methyl-ene)]diimidazolium dibromide.

Project description:The asymmetric unit of the title compound, C(20)H(28)N(4) (2+)·2Br(-), consists of half a 3,3'-di-n-propyl-1,1'-[p-phenyl-enenis(methyl-ene)]diimidazolium cation and a bromide anion. The cation is located on an inversion center and adopts an ?AAA? trans conformation. In the crystal, the cation is linked to the anions via weak C-H?Br hydrogen bonds.

| S-EPMC3212318 | biostudies-other

3,3'-Dicyclo-pentyl-1,1'-(1,3-phenyl-enedimethyl-ene)dibenzimidazol-1-ium bis-(hexa-fluoro-phosphate).

Project description:In the title compound, C(32)H(36)N(4) (2+)·2PF(6) (-), the cation and the anions each have crystallographic twofold rotation symmetry. The benzimidazole ring is almost planar [r.m.s. deviation = 0.0161?(1)?Å] and makes a dihedral angle of 5.77?(4)° with its symmetry-related component and a dihedral angle of 80.96?(5)° with the central benzene ring. The cyclo-pentyl ring adopts a half-chair conformation. In the crystal, mol-ecules are linked into a three-dimensional network through C-H?F hydrogen bonds. A C-H?? inter-action is also observed.

| S-EPMC3379432 | biostudies-literature

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