J Chem Crystallogr (2008) 38:743–747
DOI 10.1007/s10870-008-9380-4
ORIGINAL PAPER
Supramolecular Interactions in the Adduct
of Di-triethylammonium, tetrachlorobenzene-1,4-dicarboxylate
and tetrachlorobenzene-1,4-dicarboxylic acid
Fei-Fei Lan Æ Xiao-Bin Xu Æ Shi-Yao Yang Æ
Rong-Bing Huang
Received: 9 September 2007 / Accepted: 27 March 2008 / Published online: 10 April 2008
Ó Springer Science+Business Media, LLC 2008
Abstract The adduct of di-triethylammonium, tetrachloro-
benzene-1,4-dicarboxylate and tetrachlorobenzene-1,4-
[4–9]. When substituted aromatic carboxylic acids are
applied, the interactions between the substituents can be
utilized as a controllable factor to tune the structures. For
example, in the crystal structures of substituted benzoic
acids, the crystal packing modes are entirely different when
there are ClÁÁÁCl interactions between benzoic acids [4].
Although coordination compound synthesized with tetra-
chlorobenzene-1,4-dicarboxylic acid has been reported [9],
to the best of our knowledge, the study on its supramolecular
interactions has not been reported. A better understanding of
the influence of the weak supramolecular interactions
involving halogens is necessary in the field of supramolec-
ular chemistry. Here we report a case of crystalline adduct of
tetrachlorobenzene-1,4-dicarboxylic acid, in which a variety
of intermolecular interactions are observed.
+
dicarboxylic acid, i.e. {2(C H ) NH C Cl O H C Cl O },
2-
4
2
5 3
8
4
2
8
4 4
crystallizes in triclinic, P-1 with cell dimensions of a =
˚
˚
˚
8
.5080(5) A, b = 8.9789(6) A, c = 12.5212(8) A, a =
3.301(1)°, b = 109.107(1)°, c = 103.565(1)°, V = 869.2
9
3
2-
˚
1) A and Z = 2. The C Cl O and H C Cl O moieties
8 4 4 2 8 4 4
(
link with each other by O–HÁÁÁO along c axis, C–ClÁÁÁO=C
along b axis and C–ClÁÁÁCl–C along a axis to form the 3D
+
framework of the crystal structure. The (C H ) NH cations
2
5 3
reside in the cavities of the 3D framework via various
intermolecular interactions such as N–HÁÁÁO, C–HÁÁÁO and
C–HÁÁÁp.
Keywords Triethylammonium Á
Tetrachlorobenzene-1,4-dicarboxylic acid Á
Hydrogen bond Á Intermolecular interaction
Experimental
Introduction
Synthesis of Tetrachlorobenzene-1,4-dicarboxylic acid
(H C Cl O )
2 8 4 4
Supramolecular interactions have attracted significant
attention in crystallography and crystal engineering [1–5].
And among the interactions, hydrogen bonds such as
O–HÁÁÁO, N–HÁÁÁO, C–HÁÁÁO and C–HÁÁÁp have been found to
play key roles in the determination of crystal structures. The
supramolecular interactions involving halogen atoms such
as ClÁÁÁCl and ClÁÁÁO are also important influential factors in
crystal engineering [3, 4]. Aromatic carboxylic acids have
been widely used as tectons in the field of crystal engineering
Tetrachloroterephthalic nitrile (C Cl N , 13.3g, 50 mmol)
8 4 2
was suspended in a mixture of 98% H SO (90 mL),
2
4
CH COOH (90 mL) and H O (20 mL), and refluxed at
3
2
190 °C for 72 h. The mixture was cooled down and poured
into ice water (80 mL), filtrated and washed with water
(2 9 10 mL) and ethanol (2 9 10 mL). Gray powder
(13.9 g, yield 91.2%) of tetrachlorobenzene-1,4-dicarbox-
-
1
ylic acid was obtained. IR (cm ): 3442s, 2750 * 3250s,
2932, 2613, 2502, 2064, 1718s, 1653s, 1595 m, 1444s, 1365,
1
343, 1253s, 1126, 891s, 811, 788, 704, 610s. The broad and
-1
F.-F. Lan Á X.-B. Xu Á S.-Y. Yang (&) Á R.-B. Huang
Department of Chemistry, College of Chemistry and Chemical
Engineering, Xiamen University, Xiamen 361005, China
e-mail: syyang@xmu.edu.cn
strong band at 2750*3250 cm is attributed to the car-
boxyl O–H, and the bands at 1718 and 1653 cm are
attributed to the carboxyl of the tetrachlorobenzene-1,4-
-
1
123