10-Methyl-9-(2-nitro-phenoxy-carbon-yl)acridinium trifluoro-methane-sulfonate

Effective chemiluminogenic systems based on acridinium esters bearing substituents of various electronic and steric properties

A series of new acridinium esters, variously substituted in the benzene ring, have been investigated for the mechanism of light generation and ability to show chemiluminescence in various environments.

9-[(2,6-Dimethoxyphenoxy)carbonyl]-10-methylacridinium trifluoromethanesulfonate

In the crystal structure of the title compound, C₂₃H₂₀NO₄⁺·CF₃SO₃⁻, the cations are linked through C—H⋯O, C—H⋯π and π–π inter­actions [centroid-centroid distances = 3.641 (2) and 3.885 (2) Å]. The cation and the anion are held together by C—H⋯O and S—O⋯π inter­actions. The acridine ring system and the benzene ring in the cation are oriented at a dihedral angle of 8.7 (1)°. The carb­oxy group is twisted at an angle of 83.2 (1)° relative to the acridine skeleton.

9-(Biphenyl-4-yl-oxycarbon-yl)-10-methyl-acridinium trifluoro-methane-sulfonate

In the crystal structure of the title compound, C₂₇H₂₀NO₂⁺·CF₃SO₃⁻, the cations form inversion dimers through π–π inter­actions between the acridine ring systems [centroid-centroid distances = 3.668 (2)–3.994 (2) Å]. These dimers are further linked by C—H⋯O and C—H⋯π inter­actions. The cation and the anion are connected by C—H⋯O inter­actions. The mean plane of the acridine ring system makes dihedral angles of 10.6 (1) and 82.5 (1)°, respectively, with the adjacent phenyl ring and the carb­oxy group. The two phenyl rings of the biphenyl group are oriented at 42.9 (1)°.

9-Ethyl-10-methyl-acridinium trifluoro-methane-sulfonate

In the mol-ecule of the title compound, C(16)H(16)N(+)·CF(3)SO(3) (-), the central ring adopts a flattened-boat conformation, and the two aromatic rings are oriented at a dihedral angle of 3.94 (2)°. In the crystal structure, weak inter-molecular hydrogen bonds link the mol-ecules. There are π-π contacts between the aromatic rings and the central ring and one of the aromatic rings [centroid-centroid distances = 3.874 (2), 3.945 (2) and 3.814 (2) Å]. There is also an S-O⋯π contact between the central ring and one of the O atoms of the anion.