organic compounds
Dimethylammonium 3-carboxybenzoate
aDepartment of Chemistry, Youngstown State University, One University Plaza, Youngstown, OH 44555, USA
*Correspondence e-mail: srlovelacecameron@ysu.edu
The 2H8N+·C8H5O4−, consists of two dimethylammonium cations and two 3-carboxybenzoate anions. The 3-carboxybenzoate anions are linked via strong intermolecular and nearly symmetrical O—H⋯O hydrogen bonds forming infinite chains parallel to [111]. Neighbouring chains are further connected by the dimethylammonium cations via N—H⋯O bonds, resulting in a double-chain-like structure. The dihedral angles of all carboxylate groups with respect to the phenylene rings are in the range 7.9 (1)–20.48 (9)°.
of the title organic salt, CRelated literature
For supramolecular structures comprising 3-carboxybenzoates, see: Guo et al. (2010); Liu et al. (2007); Weyna et al. (2009). For similar chain-like structures, see: Ballabh et al. (2005). For hydrolysis of formamides, see: Cottineau et al. (2011); Hine et al. (1981). For a description of the Cambridge Structural Database, see: Allen (2002). For hydrogen bonding, see: Gilli & Gilli (2009).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2011); cell SAINT (Bruker, 2011); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXLE (Hübschle et al., 2011) and SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2001); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
10.1107/S160053681202096X/su2413sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053681202096X/su2413Isup2.hkl
Supporting information file. DOI: 10.1107/S160053681202096X/su2413Isup3.cml
The compound was synthesized under solvothermal conditions. In a typical synthesis, Mg(NO3)2.6H2O (0.064 g, 0.25 mmol) was dissolved in a 1:1 mixture of DMF (5.0 ml) and EtOH (5.0 ml). Then, alumina (Sorbent Technologies, Atlanta, GA) (0.051 g, 0.5 mmol), isophthalic acid (0.166 g, 1.0 mmol) and piperazine (0.043 g, 0.5 mmol) were added to the reaction mixture which was stirred for one hour before transferring the mixture into a glass vial. The final mixture was heated to 373 K for 48 h. The vial was then slowly cooled to room temperature. Slow cooling of the reaction mixture yielded colourless plate-like crystals of the title compound as a minor product.
Hydrogen atoms were placed in calculated positions with C—H bond distances of 0.95 Å (aromatic H), 0.99 Å (methyl H) or 0.88 Å (N—H). Methyl group H atoms were allowed to rotate around the C—C bond to best fit the experimental electron density. Carboxylic acid hydrogen atoms were located in difference electron density maps, but were placed in calculated positions with fixed C—O—H angles, but with the C—C—O—H dihedral angles and the O—H distances freely refined (AFIX 148 command in SHELXTL (Sheldrick, 2008)). Uiso(H) values for all H atoms were constrained to a multiple of Ueq of their respective
(1.2 times for aromatic and ammonium H atoms, 1.5 times for methyl and carboxylic acid H atoms).Data collection: APEX2 (Bruker, 2011); cell
SAINT (Bruker, 2011); data reduction: SAINT (Bruker, 2011); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXLE (Hübschle et al., 2011) and SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2001); software used to prepare material for publication: publCIF (Westrip, 2010).Fig. 1. View of the asymmetric unit with the atom-numbering scheme and 50% probability displacement ellipsoids. | |
Fig. 2. View of the one-dimensional 3-carboxybenzoate chains formed through intermolecular nearly symmetrical O—H···O bonds parallel to the (111) direction. | |
Fig. 3. View of one bis(dimethylammonium)—bis(COO-···H+···-OOC) cluster with the dimethylammonium cations bridging between neighboring 3-carboxybenzoate chains through inter-molecular N—H···O bonds. For clarity, only the ipso carbon atoms of the phenylene rings are shown. | |
Fig. 4. View of the double chain-like structure. A crystallographic inversion center between the two central phenylene rings relates the parallel chains with each other. |
C2H8N+·C8H5O4− | Z = 4 |
Mr = 211.21 | F(000) = 448 |
Triclinic, P1 | Dx = 1.338 Mg m−3 |
a = 8.439 (5) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 10.133 (8) Å | Cell parameters from 832 reflections |
c = 12.304 (9) Å | θ = 2.6–31.1° |
α = 91.858 (14)° | µ = 0.10 mm−1 |
β = 94.599 (17)° | T = 100 K |
γ = 90.009 (14)° | Plate, colourless |
V = 1048.2 (13) Å3 | 0.32 × 0.21 × 0.09 mm |
Bruker SMART APEX CCD diffractometer | 6417 independent reflections |
Radiation source: fine-focus sealed tube | 4906 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.029 |
ω scans | θmax = 31.8°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Bruker, 2011) | h = −12→12 |
Tmin = 0.684, Tmax = 0.746 | k = −14→14 |
13304 measured reflections | l = −17→18 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.049 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.125 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0443P)2 + 0.3839P] where P = (Fo2 + 2Fc2)/3 |
6417 reflections | (Δ/σ)max < 0.001 |
283 parameters | Δρmax = 0.39 e Å−3 |
0 restraints | Δρmin = −0.29 e Å−3 |
C2H8N+·C8H5O4− | γ = 90.009 (14)° |
Mr = 211.21 | V = 1048.2 (13) Å3 |
Triclinic, P1 | Z = 4 |
a = 8.439 (5) Å | Mo Kα radiation |
b = 10.133 (8) Å | µ = 0.10 mm−1 |
c = 12.304 (9) Å | T = 100 K |
α = 91.858 (14)° | 0.32 × 0.21 × 0.09 mm |
β = 94.599 (17)° |
Bruker SMART APEX CCD diffractometer | 6417 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2011) | 4906 reflections with I > 2σ(I) |
Tmin = 0.684, Tmax = 0.746 | Rint = 0.029 |
13304 measured reflections |
R[F2 > 2σ(F2)] = 0.049 | 0 restraints |
wR(F2) = 0.125 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | Δρmax = 0.39 e Å−3 |
6417 reflections | Δρmin = −0.29 e Å−3 |
283 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.59587 (16) | 0.02460 (14) | −0.25653 (10) | 0.0162 (3) | |
C2 | 0.58993 (16) | 0.13501 (13) | −0.17228 (10) | 0.0156 (2) | |
C3 | 0.48388 (15) | 0.12628 (13) | −0.09138 (10) | 0.0146 (2) | |
H3 | 0.4153 | 0.0519 | −0.0910 | 0.018* | |
C4 | 0.47801 (16) | 0.22626 (13) | −0.01100 (10) | 0.0155 (2) | |
C5 | 0.57738 (17) | 0.33635 (14) | −0.01340 (11) | 0.0180 (3) | |
H5 | 0.5745 | 0.4043 | 0.0414 | 0.022* | |
C6 | 0.68042 (18) | 0.34716 (14) | −0.09543 (12) | 0.0207 (3) | |
H6 | 0.7458 | 0.4232 | −0.0976 | 0.025* | |
C7 | 0.68748 (17) | 0.24595 (14) | −0.17441 (11) | 0.0186 (3) | |
H7 | 0.7589 | 0.2525 | −0.2299 | 0.022* | |
C8 | 0.35934 (16) | 0.21816 (14) | 0.07316 (11) | 0.0171 (3) | |
C9 | −0.11755 (16) | 0.80121 (13) | 0.53099 (11) | 0.0163 (3) | |
C10 | −0.11194 (15) | 0.71996 (13) | 0.42712 (10) | 0.0153 (2) | |
C11 | 0.01076 (16) | 0.62967 (13) | 0.41715 (11) | 0.0152 (2) | |
H11 | 0.0899 | 0.6204 | 0.4758 | 0.018* | |
C12 | 0.01843 (16) | 0.55276 (13) | 0.32181 (11) | 0.0156 (2) | |
C13 | −0.09707 (17) | 0.56792 (14) | 0.23523 (11) | 0.0183 (3) | |
H13 | −0.0916 | 0.5167 | 0.1696 | 0.022* | |
C14 | −0.21941 (18) | 0.65736 (15) | 0.24494 (11) | 0.0200 (3) | |
H14 | −0.2979 | 0.6673 | 0.1860 | 0.024* | |
C15 | −0.22774 (17) | 0.73288 (14) | 0.34092 (11) | 0.0181 (3) | |
H15 | −0.3127 | 0.7934 | 0.3476 | 0.022* | |
C16 | 0.15174 (16) | 0.45605 (14) | 0.31194 (11) | 0.0166 (3) | |
C17 | 0.60139 (18) | 0.23158 (16) | 0.50279 (12) | 0.0246 (3) | |
H17A | 0.5285 | 0.1660 | 0.5280 | 0.037* | |
H17B | 0.6147 | 0.3049 | 0.5567 | 0.037* | |
H17C | 0.7048 | 0.1905 | 0.4936 | 0.037* | |
C18 | 0.64148 (18) | 0.37914 (15) | 0.35102 (12) | 0.0230 (3) | |
H18A | 0.7438 | 0.3373 | 0.3395 | 0.035* | |
H18B | 0.6586 | 0.4550 | 0.4021 | 0.035* | |
H18C | 0.5924 | 0.4091 | 0.2813 | 0.035* | |
C19 | 0.07030 (19) | 1.03645 (15) | 0.80345 (14) | 0.0268 (3) | |
H19A | 0.0896 | 1.0796 | 0.8757 | 0.040* | |
H19B | −0.0110 | 1.0855 | 0.7601 | 0.040* | |
H19C | 0.1691 | 1.0350 | 0.7667 | 0.040* | |
C20 | 0.13291 (19) | 0.82098 (16) | 0.88063 (13) | 0.0262 (3) | |
H20A | 0.0922 | 0.7313 | 0.8874 | 0.039* | |
H20B | 0.1530 | 0.8628 | 0.9533 | 0.039* | |
H20C | 0.2322 | 0.8171 | 0.8444 | 0.039* | |
N1 | 0.53500 (14) | 0.28220 (12) | 0.39679 (9) | 0.0178 (2) | |
H1A | 0.4386 | 0.3216 | 0.4061 | 0.021* | |
H1B | 0.5174 | 0.2123 | 0.3477 | 0.021* | |
N2 | 0.01442 (14) | 0.89893 (12) | 0.81537 (9) | 0.0178 (2) | |
H2A | −0.0795 | 0.9006 | 0.8486 | 0.021* | |
H2B | −0.0050 | 0.8590 | 0.7474 | 0.021* | |
O1 | 0.72388 (12) | 0.01992 (10) | −0.30648 (8) | 0.0205 (2) | |
O2 | 0.48067 (12) | −0.05209 (10) | −0.27252 (8) | 0.0221 (2) | |
O3 | 0.38017 (13) | 0.30395 (11) | 0.15297 (8) | 0.0237 (2) | |
H3A | 0.255 (4) | 0.332 (3) | 0.198 (2) | 0.092 (10)* | |
O4 | 0.24967 (12) | 0.13580 (10) | 0.06142 (8) | 0.0210 (2) | |
O5 | −0.24912 (12) | 0.86489 (11) | 0.53935 (9) | 0.0223 (2) | |
H5A | −0.260 (3) | 0.933 (2) | 0.618 (2) | 0.066 (8)* | |
O6 | −0.00266 (12) | 0.80375 (11) | 0.59990 (8) | 0.0212 (2) | |
O7 | 0.13688 (12) | 0.38054 (11) | 0.22481 (8) | 0.0220 (2) | |
O8 | 0.26436 (12) | 0.45389 (10) | 0.38262 (8) | 0.0204 (2) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0177 (6) | 0.0175 (6) | 0.0131 (5) | 0.0032 (5) | 0.0005 (5) | −0.0018 (5) |
C2 | 0.0163 (6) | 0.0160 (6) | 0.0140 (6) | 0.0037 (5) | −0.0003 (5) | −0.0020 (5) |
C3 | 0.0143 (6) | 0.0145 (6) | 0.0147 (6) | 0.0016 (5) | −0.0001 (4) | −0.0020 (5) |
C4 | 0.0159 (6) | 0.0156 (6) | 0.0146 (6) | 0.0046 (5) | −0.0005 (5) | −0.0014 (5) |
C5 | 0.0211 (7) | 0.0142 (6) | 0.0181 (6) | 0.0023 (5) | −0.0009 (5) | −0.0025 (5) |
C6 | 0.0234 (7) | 0.0153 (6) | 0.0234 (7) | −0.0017 (5) | 0.0016 (5) | −0.0001 (5) |
C7 | 0.0203 (6) | 0.0180 (6) | 0.0178 (6) | 0.0001 (5) | 0.0039 (5) | 0.0005 (5) |
C8 | 0.0156 (6) | 0.0198 (6) | 0.0155 (6) | 0.0058 (5) | 0.0000 (5) | −0.0021 (5) |
C9 | 0.0167 (6) | 0.0157 (6) | 0.0167 (6) | 0.0000 (5) | 0.0030 (5) | −0.0015 (5) |
C10 | 0.0147 (6) | 0.0164 (6) | 0.0148 (6) | −0.0012 (5) | 0.0019 (5) | −0.0015 (5) |
C11 | 0.0141 (6) | 0.0159 (6) | 0.0157 (6) | −0.0005 (5) | 0.0015 (5) | −0.0012 (5) |
C12 | 0.0157 (6) | 0.0156 (6) | 0.0155 (6) | −0.0012 (5) | 0.0030 (5) | −0.0016 (5) |
C13 | 0.0227 (7) | 0.0189 (6) | 0.0129 (6) | 0.0006 (5) | 0.0011 (5) | −0.0025 (5) |
C14 | 0.0221 (7) | 0.0221 (7) | 0.0152 (6) | 0.0026 (5) | −0.0029 (5) | −0.0001 (5) |
C15 | 0.0174 (6) | 0.0185 (6) | 0.0183 (6) | 0.0023 (5) | 0.0008 (5) | −0.0003 (5) |
C16 | 0.0157 (6) | 0.0181 (6) | 0.0164 (6) | −0.0006 (5) | 0.0049 (5) | −0.0026 (5) |
C17 | 0.0206 (7) | 0.0306 (8) | 0.0221 (7) | −0.0038 (6) | −0.0030 (5) | 0.0021 (6) |
C18 | 0.0219 (7) | 0.0226 (7) | 0.0242 (7) | −0.0064 (6) | 0.0000 (6) | 0.0001 (6) |
C19 | 0.0229 (7) | 0.0225 (7) | 0.0340 (8) | −0.0042 (6) | −0.0045 (6) | 0.0024 (6) |
C20 | 0.0233 (7) | 0.0266 (8) | 0.0271 (7) | 0.0006 (6) | −0.0080 (6) | −0.0003 (6) |
N1 | 0.0151 (5) | 0.0197 (6) | 0.0182 (5) | −0.0001 (4) | 0.0002 (4) | −0.0036 (4) |
N2 | 0.0156 (5) | 0.0219 (6) | 0.0156 (5) | −0.0007 (4) | 0.0006 (4) | −0.0027 (4) |
O1 | 0.0183 (5) | 0.0244 (5) | 0.0189 (5) | 0.0018 (4) | 0.0052 (4) | −0.0058 (4) |
O2 | 0.0196 (5) | 0.0229 (5) | 0.0231 (5) | −0.0016 (4) | 0.0027 (4) | −0.0090 (4) |
O3 | 0.0203 (5) | 0.0294 (6) | 0.0209 (5) | 0.0012 (4) | 0.0038 (4) | −0.0111 (4) |
O4 | 0.0194 (5) | 0.0249 (5) | 0.0188 (5) | −0.0002 (4) | 0.0042 (4) | −0.0034 (4) |
O5 | 0.0165 (5) | 0.0254 (5) | 0.0241 (5) | 0.0048 (4) | 0.0013 (4) | −0.0095 (4) |
O6 | 0.0171 (5) | 0.0276 (6) | 0.0179 (5) | 0.0029 (4) | −0.0006 (4) | −0.0064 (4) |
O7 | 0.0201 (5) | 0.0247 (5) | 0.0205 (5) | 0.0024 (4) | 0.0024 (4) | −0.0099 (4) |
O8 | 0.0179 (5) | 0.0213 (5) | 0.0214 (5) | 0.0043 (4) | 0.0006 (4) | −0.0051 (4) |
C1—O2 | 1.2438 (18) | C14—H14 | 0.9500 |
C1—O1 | 1.2850 (17) | C15—H15 | 0.9500 |
C1—C2 | 1.504 (2) | C16—O8 | 1.2364 (17) |
C2—C7 | 1.395 (2) | C16—O7 | 1.2945 (17) |
C2—C3 | 1.396 (2) | C17—N1 | 1.485 (2) |
C3—C4 | 1.3964 (19) | C17—H17A | 0.9800 |
C3—H3 | 0.9500 | C17—H17B | 0.9800 |
C4—C5 | 1.398 (2) | C17—H17C | 0.9800 |
C4—C8 | 1.501 (2) | C18—N1 | 1.485 (2) |
C5—C6 | 1.391 (2) | C18—H18A | 0.9800 |
C5—H5 | 0.9500 | C18—H18B | 0.9800 |
C6—C7 | 1.394 (2) | C18—H18C | 0.9800 |
C6—H6 | 0.9500 | C19—N2 | 1.487 (2) |
C7—H7 | 0.9500 | C19—H19A | 0.9800 |
C8—O4 | 1.2427 (18) | C19—H19B | 0.9800 |
C8—O3 | 1.2915 (18) | C19—H19C | 0.9800 |
C9—O6 | 1.2354 (17) | C20—N2 | 1.477 (2) |
C9—O5 | 1.2938 (17) | C20—H20A | 0.9800 |
C9—C10 | 1.502 (2) | C20—H20B | 0.9800 |
C10—C11 | 1.392 (2) | C20—H20C | 0.9800 |
C10—C15 | 1.393 (2) | N1—H1A | 0.9200 |
C11—C12 | 1.3931 (19) | N1—H1B | 0.9200 |
C11—H11 | 0.9500 | N2—H2A | 0.9200 |
C12—C13 | 1.397 (2) | N2—H2B | 0.9200 |
C12—C16 | 1.502 (2) | O3—H3A | 1.26 (3) |
C13—C14 | 1.384 (2) | O5—H5A | 1.18 (2) |
C13—H13 | 0.9500 | O7—H3A | 1.18 (3) |
C14—C15 | 1.393 (2) | ||
O2—C1—O1 | 125.98 (13) | C14—C15—H15 | 119.9 |
O2—C1—C2 | 119.15 (12) | O8—C16—O7 | 125.23 (13) |
O1—C1—C2 | 114.87 (12) | O8—C16—C12 | 120.54 (12) |
C7—C2—C3 | 119.73 (12) | O7—C16—C12 | 114.22 (12) |
C7—C2—C1 | 121.09 (13) | N1—C17—H17A | 109.5 |
C3—C2—C1 | 119.17 (12) | N1—C17—H17B | 109.5 |
C2—C3—C4 | 120.34 (13) | H17A—C17—H17B | 109.5 |
C2—C3—H3 | 119.8 | N1—C17—H17C | 109.5 |
C4—C3—H3 | 119.8 | H17A—C17—H17C | 109.5 |
C3—C4—C5 | 119.39 (13) | H17B—C17—H17C | 109.5 |
C3—C4—C8 | 119.84 (13) | N1—C18—H18A | 109.5 |
C5—C4—C8 | 120.69 (12) | N1—C18—H18B | 109.5 |
C6—C5—C4 | 120.52 (13) | H18A—C18—H18B | 109.5 |
C6—C5—H5 | 119.7 | N1—C18—H18C | 109.5 |
C4—C5—H5 | 119.7 | H18A—C18—H18C | 109.5 |
C5—C6—C7 | 119.77 (13) | H18B—C18—H18C | 109.5 |
C5—C6—H6 | 120.1 | N2—C19—H19A | 109.5 |
C7—C6—H6 | 120.1 | N2—C19—H19B | 109.5 |
C6—C7—C2 | 120.22 (13) | H19A—C19—H19B | 109.5 |
C6—C7—H7 | 119.9 | N2—C19—H19C | 109.5 |
C2—C7—H7 | 119.9 | H19A—C19—H19C | 109.5 |
O4—C8—O3 | 125.16 (13) | H19B—C19—H19C | 109.5 |
O4—C8—C4 | 120.20 (12) | N2—C20—H20A | 109.5 |
O3—C8—C4 | 114.61 (13) | N2—C20—H20B | 109.5 |
O6—C9—O5 | 125.27 (13) | H20A—C20—H20B | 109.5 |
O6—C9—C10 | 120.41 (13) | N2—C20—H20C | 109.5 |
O5—C9—C10 | 114.32 (12) | H20A—C20—H20C | 109.5 |
C11—C10—C15 | 119.48 (12) | H20B—C20—H20C | 109.5 |
C11—C10—C9 | 119.35 (12) | C17—N1—C18 | 112.80 (12) |
C15—C10—C9 | 121.16 (13) | C17—N1—H1A | 109.0 |
C10—C11—C12 | 120.50 (12) | C18—N1—H1A | 109.0 |
C10—C11—H11 | 119.7 | C17—N1—H1B | 109.0 |
C12—C11—H11 | 119.7 | C18—N1—H1B | 109.0 |
C11—C12—C13 | 119.54 (13) | H1A—N1—H1B | 107.8 |
C11—C12—C16 | 119.98 (12) | C20—N2—C19 | 111.54 (12) |
C13—C12—C16 | 120.48 (12) | C20—N2—H2A | 109.3 |
C14—C13—C12 | 120.12 (13) | C19—N2—H2A | 109.3 |
C14—C13—H13 | 119.9 | C20—N2—H2B | 109.3 |
C12—C13—H13 | 119.9 | C19—N2—H2B | 109.3 |
C13—C14—C15 | 120.16 (13) | H2A—N2—H2B | 108.0 |
C13—C14—H14 | 119.9 | C8—O3—H3A | 114.0 (13) |
C15—C14—H14 | 119.9 | C9—O5—H5A | 117.8 (12) |
C10—C15—C14 | 120.19 (13) | C16—O7—H3A | 115.5 (14) |
C10—C15—H15 | 119.9 | ||
O2—C1—C2—C7 | −159.33 (13) | O6—C9—C10—C11 | 11.4 (2) |
O1—C1—C2—C7 | 20.32 (18) | O5—C9—C10—C11 | −168.79 (12) |
O2—C1—C2—C3 | 20.12 (19) | O6—C9—C10—C15 | −169.00 (13) |
O1—C1—C2—C3 | −160.23 (12) | O5—C9—C10—C15 | 10.86 (19) |
C7—C2—C3—C4 | −1.72 (19) | C15—C10—C11—C12 | 0.1 (2) |
C1—C2—C3—C4 | 178.82 (12) | C9—C10—C11—C12 | 179.78 (12) |
C2—C3—C4—C5 | 1.13 (19) | C10—C11—C12—C13 | 0.8 (2) |
C2—C3—C4—C8 | 177.77 (12) | C10—C11—C12—C16 | 179.79 (12) |
C3—C4—C5—C6 | 0.5 (2) | C11—C12—C13—C14 | −1.0 (2) |
C8—C4—C5—C6 | −176.10 (13) | C16—C12—C13—C14 | −179.93 (13) |
C4—C5—C6—C7 | −1.6 (2) | C12—C13—C14—C15 | 0.2 (2) |
C5—C6—C7—C2 | 1.0 (2) | C11—C10—C15—C14 | −0.9 (2) |
C3—C2—C7—C6 | 0.7 (2) | C9—C10—C15—C14 | 179.43 (13) |
C1—C2—C7—C6 | −179.87 (13) | C13—C14—C15—C10 | 0.8 (2) |
C3—C4—C8—O4 | −12.05 (19) | C11—C12—C16—O8 | −7.9 (2) |
C5—C4—C8—O4 | 164.55 (13) | C13—C12—C16—O8 | 171.06 (13) |
C3—C4—C8—O3 | 169.72 (12) | C11—C12—C16—O7 | 172.93 (12) |
C5—C4—C8—O3 | −13.68 (18) | C13—C12—C16—O7 | −8.10 (19) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···O8 | 0.92 | 2.00 | 2.869 (2) | 157 |
N1—H1B···O2i | 0.92 | 1.84 | 2.744 (2) | 166 |
N2—H2A···O4ii | 0.92 | 1.93 | 2.822 (2) | 164 |
N2—H2B···O6 | 0.92 | 1.88 | 2.784 (2) | 166 |
O7—H3A···O3 | 1.18 (3) | 1.26 (3) | 2.4177 (19) | 166 (3) |
O7—H3A···O4 | 1.18 (3) | 2.56 (3) | 3.329 (2) | 121.1 (18) |
O5—H5A···O1iii | 1.18 (2) | 1.27 (2) | 2.4483 (19) | 171 (2) |
O5—H5A···O2iii | 1.18 (2) | 2.66 (2) | 3.462 (2) | 124.2 (15) |
Symmetry codes: (i) −x+1, −y, −z; (ii) −x, −y+1, −z+1; (iii) x−1, y+1, z+1. |
Experimental details
Crystal data | |
Chemical formula | C2H8N+·C8H5O4− |
Mr | 211.21 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 100 |
a, b, c (Å) | 8.439 (5), 10.133 (8), 12.304 (9) |
α, β, γ (°) | 91.858 (14), 94.599 (17), 90.009 (14) |
V (Å3) | 1048.2 (13) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.32 × 0.21 × 0.09 |
Data collection | |
Diffractometer | Bruker SMART APEX CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2011) |
Tmin, Tmax | 0.684, 0.746 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 13304, 6417, 4906 |
Rint | 0.029 |
(sin θ/λ)max (Å−1) | 0.741 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.049, 0.125, 1.06 |
No. of reflections | 6417 |
No. of parameters | 283 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.39, −0.29 |
Computer programs: APEX2 (Bruker, 2011), SAINT (Bruker, 2011), SHELXS97 (Sheldrick, 2008), SHELXLE (Hübschle et al., 2011) and SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg, 2001), publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···O8 | 0.92 | 2.00 | 2.869 (2) | 156.8 |
N1—H1B···O2i | 0.92 | 1.84 | 2.744 (2) | 165.7 |
N2—H2A···O4ii | 0.92 | 1.93 | 2.822 (2) | 164.4 |
N2—H2B···O6 | 0.92 | 1.88 | 2.784 (2) | 165.8 |
O7—H3A···O3 | 1.18 (3) | 1.26 (3) | 2.4177 (19) | 166 (3) |
O7—H3A···O4 | 1.18 (3) | 2.56 (3) | 3.329 (2) | 121.1 (18) |
O5—H5A···O1iii | 1.18 (2) | 1.27 (2) | 2.4483 (19) | 171 (2) |
O5—H5A···O2iii | 1.18 (2) | 2.66 (2) | 3.462 (2) | 124.2 (15) |
Symmetry codes: (i) −x+1, −y, −z; (ii) −x, −y+1, −z+1; (iii) x−1, y+1, z+1. |
Acknowledgements
We thank the Department of Energy (DOE) and the National Energy Technology Laboratory (NETL), USA, for financial support. The X-ray diffractometer was funded by National Science Foundation grant 0087210, Ohio Board of Regents grant CAP-491, and by Youngstown State University.
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
The title compound, dimethylammonium 3-carboxybenzoate, was obtained as part of our investigations into the solvothermal synthesis of metal organic frameworks of magnesium with aromatic dicarboxylates. Reaction of magnesium nitrate with isophthalic acid and piperazine at 373 K did not yield an extended metal organic framework, but partial decomposition of the DMF solvent let to formation of the title dimethylammonium organic salt, which was isolated as a minor side product in the form of colourless plate-like crystals. Under the rather harsh solvothermal conditions used for the synthesis of many coordination compounds and metal organic frameworks formamides become unstable towards hydrolysis or Lewis acid catalyzed decarbonylation (Hine et al., 1981; Cottineau et al., 2011). This is also evidenced by the high number of dimethyl ammonium salts reported in the Cambridge Structural Database (CSD; Allen et al., 2002; 597 entries up to Feb. 2012), counting only structures that also contain at least one metal ion. With dimethyl amine itself being a gas and being used not extensively as a reagent, it can be safely assumed that most of these structures originated from in situ hydrolysis of a dimethyl amide such as DMF. Twenty eight of these entries in the CSD with dimethyl ammonium ions also contain formate ions, the other product of DMF hydrolysis. The title compound, the dimethylammonium salt of isophtalic acid, is one such example that incorporates ammonium cations formed in situ through decomposition of a formamide.
The asymmetric unit of the title compound is composed of two hydrogen-3-carboxybenzoate anions and two dimethyl ammonium cations (Fig. 1), which are connected with each other through an intricate network of N—H···O and O—H···O hydrogen bonds (Figs. 2–4). Details of the hydrogen bonding are given in Table 1. Individual 3-carboxybenzoate anions are monoprotonated, and are connected with each other through very strong and nearly symmetric O—H···O hydrogen bonds to form infinite chains parallel to the space diagonal of the unit cell (Fig. 2). Molecules in the chains are arranged in an ABAB···fashion, with crystallographically different monoanions alternating with each other. The O—H···O hydrogen bonds are characterized by nearly equidistant D—H and A—H distances (Table 1), as is typical for very strong hydrogen bonds with very electronegative donor and acceptor atoms (Gilli & Gilli, 2009). The keto oxygen atoms of the carboxylate units, which are not involved in the O—H···O hydrogen bonds, act as acceptors for N—H···O hydrogen bonds that originate from both of the dimethylammonium cations, which double bridge the carboxylic acid and carboxylate groups of the anions into a bis(dimethylammonium)—bis(COO-···H+···-OOC) cluster (Fig. 3). In such a manner parallel infinite 3-carboxybenzoate chains are connected into an inversion symmetric double chain like structure (Fig. 4).
Supramolecular structures comprising 3-carboxybenzoates have been reported previously (Guo et al., 2010; Liu et al., 2007; Weyna et al., 2009). Similar one-dimensional chain-like structures have been reported by (Ballabh et al., 2005).