Poly[bis­(acetone-κO)bis­{μ3-1-[(5-chloro-2-oxidophenyl)diazenyl]-2-naphtholato-κ4 O:O,O′:O′}­sodium(I)­chromium(III)]

The title compound, [CrNa(C16H9ClN2O2)2(C3H6O)2]n, is an azo-CrIII complex polymer that is used as a charge-control agent in electrophotography. The monomeric unit is composed of octa­hedral CrIII and NaI units, and is characterized by twofold rotation symmetry. The CrIII atom is chelated by two N and four O atoms from two [(5-chloro-2-oxidophen­yl)diazen­yl]-2-naphtholate ligands. The ligand anion exists in the cis form. The NaI atom is coordinated by two phen­oxy O atoms from a neighboring CrIII unit, two naphth­oxy O atoms from another neighboring CrIII unit and two O atoms from acetone mol­ecules. The dinuclear complex forms a one-dimensional polymer running along the c axis

Benzyl­tributyl­ammonium 4-hydroxy­naphthalene-2-sulfonate

The title compound, C19H34N+·C10H7O4S−, is a charge-control agent used for toners in electrophotography. In the crystal structure, centrosymmetric anions associate through O—H⋯O hydrogen bonds formed between the O—H group of one anion and the sulfonate O atom of a neighbor. The components of the dimer are offset with respect to each other so that the separation between the two parallel naphthalene skeletons is about 1.6 Å. The ethyl residues of two of the butyl groups are disordered and were modelled over two postions (site occupancies = 0.33/0.67 and 0.34/0.66)

A low-temperature phase of the 1:1 complex of 2-(6-diethylamino-3-diethyl­iminio-3H-xanthen-9-yl)benzoate with ethyl gallate at 93 K

The title compound, C28H30N2O3·C9H10O5, is a well known red leuco complex of 2-(6-diethylamino-3-diethyl­iminio-3H-xanthen-9-yl)benzoate (rhodamine B base abbreviated to RBB, a leuco dye) with ethyl gallate (EG, developer). The structure of the complex at room temperature has recently been reported by Sekiguchi, Takayama, Gotanda & Sano [Chem. Lett. (2007 ▶), 36, 1010–1011]. We have found a new phase of the material with two discrete base/developer complexes (RBB-A/EG-A and RBB-B/EG-B) in the asymmetric unit at 93 K. There are no significant differences between the two developer mol­ecules EG-A and EG-B. The lactone ring of RBB is opened in each mol­ecule to form a zwitterionic structure. However, the xanthene system is almost flat in RBB-A (r.m.s. deviation 0.0234 Å) but is less so in RBB-B (r.m.s. deviation 0.1095 Å). Furthermore, the ethyl groups of the xanthene diethyl­amino substituents lie on the same side of the xanthene plane in RBB-A but on opposite sides in RBB-B. Dimeric dye/developer complexes are formed through inter- and intra­molecular O—H⋯O hydrogen bonds and are linked further into dimers by additional O—H⋯O hydrogen bonds involving either EG-A or EG-B developer mol­ecules

A redetermination of 2-(6-diethyl­amino-3-diethyl­iminio-3H-xanthen-9-yl)benzoate–ethyl gallate (1/1) at room temperature

The title compound, C28H30N2O3·C9H10O5, is a well known red leuco complex of 2-(6-diethyl­amino-3-diethyl­iminio-3H-xanthene-9-yl)benzoate (rhodamine B base abbreviated to RBB: leuco dye) with ethyl gallate (EG: developer). The structure of the complex at room temperature has recently been reported by Sekiguchi, Takayama, Gotanda & Sano [(2007) Chem. Lett. 36, 1010–1011]. The RBB–EG complex forms a dimer (RBB⋯EG⋯EG⋯RBB) through inter­molecular O—H⋯O hydrogen bonds. In a subsequent re-examination of the structure at room temperature, we found the RBB mol­ecule to be disordered with a methyl group of one ethyl substituent of a diethyl­amino group at one extremity of the xanthene unit disordered over two positions [occupancies: 0.735 (5)/0.265 (5)]. Furthermore, at the other end of the xanthene residue, the entire diethyl­amino substituent (i.e. the N atom and the associated C and H atoms) was also disordered over two sites with occupancies 0.653 (7)/0.347 (7). This leads to four kinds of RBB conformations, which, in turn, results in the formation of 16 discrete RBB⋯EG⋯EG⋯RBB dimers in the crystal

Benzyl­tributyl­ammonium 4,6-dihydroxy­naphthalene-2-sulfonate

The title mol­ecular salt, C19H34N+·C10H7O5S−, is a charge-control agent used for toners in electrophotography with a high melting point of 508 K. In the crystal structure, the anions form inversion dimers, linked by pairs of O—H⋯O hydrogen bonds. Further O—H⋯O links between dimers generate anionic sheets propagating in (010). One of the n-butyl chains of the cation is disordered over two sets of sites in a 0.53:0.47 ratio

Benzyl­tributyl­ammonium 6,7-dihydroxy­naphthalene-2-sulfonate

The title mol­ecular salt, C19H34N+·C10H7O5S−, is a charge-control agent used for toners in electrophotography. There are two formula units in the asymmetric unit. Both anions form inversion dimers connected by pairs of O—H⋯O hydrogen bonds between the –OH group of one anion and a sulfonic O atom of the neighboring one. The two dimers A and B are characterized by a step between the least-squares planes of the naphthalene atoms of 0.85 and 2.30 Å. Further O—H⋯O bonds link the dimers into a two-dimensional network propagating in (110) such that dimer A is hydrogen-bonded to four B units and vice versa. One of the tert-butyl chains in one of the cations is disordered over two sets of sites in a 0.56:0.44 ratio

Benzyl­tributyl­ammonium 7-hydroxy­naphthalene-1-sulfonate

The title compound, C19H34N+·C10H7O4S−, is a charge-control agent used for toners in electrophotography. The anions form one-dimensional chains by O—H⋯O hydrogen bonds in a zigzag fashion along the c axis between the OH group of one anion and the sulfonate O atom of a neighboring anion. One of the n-butyl chains of the cation is disordered over two sites in a 0.77:0.23 ratio

Diacetonitrile­tetra­kis{μ2-3-anilinocarbonyl-1-[(5-chloro-2-oxidophen­yl)diazen­yl]-2-naphtholato}tetra­aqua­diiron(III)disodium(I) dihydrate. Corrigendum

Corrigendum to Acta Cryst. (2008), E64, m240–m241

N,N′-Bis(2-phenyl­ethyl)naphthalene-1,8:4,5-bis­(dicarboximide)

The title compound, C30H22N2O4, is a derivative of the naphthalene–imide pigments that are characterized by significant overlap of the stacked mol­ecules. The mol­ecule has a centre of symmetry. Accordingly, the phenylethyl groups are arranged in a trans fashion across the skeleton. The phenyl rings are not parallel to the naphthalene­imide skeleton and are twisted in the same direction by 9.27 (7)°. The mol­ecules are, however, stacked with insignificant overlap along the stacking axis, as characterized by appreciable slide in the direction of either the short or the long mol­ecular axis, in marked contrast to the ordinary naphthalene–imide pigments

Benzyl­tributyl­ammonium 6-hydroxy­naphthalene-2-sulfonate

The title compound, C19H34N+·C10H7O4S−, is a charge-control agent for toners used in electrophotography. Inter­moleclar O—H⋯O hydrogen bonding between the OH group of one anion and the sulfonate O atom of a neighboring anion leads to the formation of one-dimensional chains along the b axis. In addition, C—H⋯O hydrogen bonds are observed. One of the n-butyl chains of the cation is disordered over two sites in a 0.88:0.12 ratio