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The title complex, [Re2(C27H25N2O2)H(CO)8]·0.67C4H8O, was formed as a product in the reaction of a rhenium(I)–Fischer carbene complex with a free NHC carbene. The coordination environment about the two Re atoms is slightly distorted octahedral, including a bridging H atom. The imidazolium and furan groups are almost coplanar, whereas the mesityl substituents show an almost perpendicular arrangement with respect to both heterocyclic units. Molecules of the complex pack in such a way as to form channels parallel with the bc unit-cell face diagonal running through the unit face diagonal. These channels are partially occupied by tetrahydrofuran solvent molecules.
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The title compound, C15H16O, crystallizes with two independent molecules in the asymmetric unit. Due to the space-group symmetry, this results in the formation of a tetramer where the four molecules are connected by O—H
O hydrogen bonds. The molecules pack parallel to the c axis. Both molecules in the asymmetric unit are nonplanar and the dihedral angles between connected aromatic rings in each molecule are 7.96 (12) and 9.75 (13)°. This contrasts with the gas phase density functional theory (DFT) optimized conformation, where this dihedral angle is 39.33°.
O hydrogen bonds. The molecules pack parallel to the c axis. Both molecules in the asymmetric unit are nonplanar and the dihedral angles between connected aromatic rings in each molecule are 7.96 (12) and 9.75 (13)°. This contrasts with the gas phase density functional theory (DFT) optimized conformation, where this dihedral angle is 39.33°.metal-organic compoundsOpen access
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The octahedral coordination of the Cr0 atom in the title compound, [Cr(C20H24N2)(CO)4], displays some distortion. This is manifested by an exocyclic torsion angle C(mesitylene)—N—Cr—C(carbonyl) that deviates by more than 20° from planarity. Another structural feature is the significant distortion from linearity of the Cr—C—O angles of the two carbonyl groups that interact with both ortho-methyl groups of the two mesitylene rings. The remaining two carbonyl groups overlap with the centres of the mesitylene rings themselves and are linear within <3°.
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The asymmetric unit of the title salt, C6H20N42+·2I−, comprises half a 3,6-diazaoctane-1,8-diaminium dication plus an I− anion. The dications are symmetrical and lie across crystallographic centres of inversion. In the crystal, the ions form a network involving mainly weak N—HI intermolecular interactions: two H atoms of the ammonium group form interactions with two I− anions and the H atom of the secondary amine forms a weak interaction with a third I− cation. The third ammonium H atom is hydrogen bonded to a secondary amine of an adjacent cation. The backbone of the cation does not form a uniformly trans chain, but is `kinked' [C—N—C—C torsion angle = 71.5 (2)°], probably to accommodate the direct hydrogen bond between the ammonium group and the secondary amine in an adjacent cation.
I intermolecular interactions: two H atoms of the ammonium group form interactions with two I− anions and the H atom of the secondary amine forms a weak interaction with a third I− cation. The third ammonium H atom is hydrogen bonded to a secondary amine of an adjacent cation. The backbone of the cation does not form a uniformly trans chain, but is `kinked' [C—N—C—C torsion angle = 71.5 (2)°], probably to accommodate the direct hydrogen bond between the ammonium group and the secondary amine in an adjacent cation.organic compoundsOpen access
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The asymmetric unit of the title salt, C8H22N42+·2C7H5O3−, comprises half a 2,2′-(piperazine-1,4-diyl)diethanaminium dication plus a 2-hydroxybenzoate anion. In the crystal, the anions and cations are linked by N—HO and O—HO hydrogen bonds to form infinite two-dimensional networks parallel with the a unit-cell face. The conformation adopted by the cation in the crystal is very similar to that adopted by the same cation in the structures of the nitrate and tetrahydrogen pentaborate salts.
O and O—HO hydrogen bonds to form infinite two-dimensional networks parallel with the a unit-cell face. The conformation adopted by the cation in the crystal is very similar to that adopted by the same cation in the structures of the nitrate and tetrahydrogen pentaborate salts.organic compoundsOpen access
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The asymmetric unit of the title salt C8H22N42+·2C7H5O2−, comprises two independent pairs of half a 2,2′-(piperazine-1,4-diyl)diethanaminium dication plus a benzoate anion. The dications are symmetrical and lie across crystallographic centres of inversion. The crystal structure was refined as a two-component pseudo-merohedral twin using the twin law 001 0-10 100 [he domain fractions are 0.8645 (8) and 0.1355 (8)]. The anions and cations are linked by N—HO hydrogen bonds and weak N—HO intermolecular interactions to form infinite two-dimensional networks parallel to [101]. The conformation adopted by the cation in the crystal structure is very similar to that adopted by the same cation in the structures of the 2-hydroxybenzoate [Cukrowski et al. (2012). Acta Cryst, E68, o2387], the nitrate and the tetrahydrogen pentaborate salts.
O hydrogen bonds and weak N—HO intermolecular interactions to form infinite two-dimensional networks parallel to [101]. The conformation adopted by the cation in the crystal structure is very similar to that adopted by the same cation in the structures of the 2-hydroxybenzoate [Cukrowski et al. (2012). Acta Cryst, E68, o2387], the nitrate and the tetrahydrogen pentaborate salts.
