Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807032862/gw2015sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807032862/gw2015Isup2.hkl |
CCDC reference: 657737
A solution of 2-amino nicotinic acid (0.036 mmol) in ethanol (5 ml) is added drop by drop under stirring to a dilute solution of H3PO4 (0.25 mmol) in water (20 ml). The obtained solution is slowly evaporated at the ambiant temperature. After some days, transparent thin single crystals of the title compound are formed in the reactionnel midle.
Intermolecular and intramolecular H-bonds constitute an important factor to understand and interprate the properties of biological and pharmacological materials. For that purpose, organic phosphate could be used as interesting models. In the presence of organic cations, the formation of (H2PO4–)n polyanions is observed. These polymeric anions could provide interesting supramolecular networks with a variety of novel structural features (Blessing, (1986); Adams, (1977); Desiraju, (1989) and (1995)).
As part of our study of organic cation monophosphate, we have synthesized a new compound,2-amino-3-nicotinium acid dihydrogenmonophosphate (I). The formula unit (I) constitute the assymetric unit which is built of one (H2PO4)- anion and one (C5N2H6CO2H)+ cation (Fig. 1).
The main geometrical features of anions and cations are reported in table 1. The monophosphate anions have slightly distorted tetrahedral geometry, with the P—O bond lengths ranging from 1.5049 (16)–1.5628 (14)Å and the O—P—O angles ranging from 106.46 (9)–115.27 (10)°. As expected, the geometric parameters of the H2PO4- anion agree with those previously observed for monophosphate polyanions with no internal symmetry (Hebert, (1978); Masse and Durif, (1990)).
The H2P O4- tetrahedra are interconnected by strong hydrogen bonds in way to form infinite ribbons extending along the b axis. These ribbons, which are organized in planes parallel to (101), are interconnected by the organic molecules so to form thick layers of hybrid organic-inorganic entities parallel to the (10–1) plane (Fig. 2). These entities manifest multiple hydtogen bonds of types N—H···O, O—H···O and C—H···O to keep up the network cohesion.
Each H2PO4 group is linked to four adjacent phosphoric groups by two donors and two acceptors strong hydrogen bonds in which the corresponding O···O distances lie in the range 2.504 (3)–2.560 (3) Å on one side, and to two organic cations by three acceptors weak hydrogen bonds on the other side.
The hydrogen atoms belonging to NH2 groups participate in addition in intramolecular interaction with N2—H2B···O5 = 2.086 Å distance to maintain the cohesion of organic cations.
For related literature, see: Adams (1977); Blessing (1986); Desiraju (1989, 1995); Hebert (1978); Masse & Durif (1990).
Data collection: CAD-4 EXPRESS (Enraf–Nonius, 1994); cell refinement: CAD-4 EXPRESS; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
Fig. 1. view of (I) with atom numbering scheme. Displacement ellipsoids for non-H atoms are drawn at the 30% probability level | |
Fig. 2. Projection of (I) along b axis. |
C6H7N2O2+·H2PO4− | F(000) = 488 |
Mr = 236.12 | Dx = 1.659 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 25 reflections |
a = 12.877 (3) Å | θ = 10–13° |
b = 4.658 (3) Å | µ = 0.30 mm−1 |
c = 15.978 (2) Å | T = 295 K |
β = 99.43 (3)° | Prism, colourless |
V = 945.4 (7) Å3 | 0.21 × 0.19 × 0.17 mm |
Z = 4 |
Enraf–Nonius CAD-4 diffractometer | Rint = 0.013 |
Radiation source: fine-focus sealed tube | θmax = 30.0°, θmin = 3.2° |
Graphite monochromator | h = −18→17 |
non–profiled ω scans | k = −6→6 |
3295 measured reflections | l = 0→9 |
1646 independent reflections | 2 standard reflections every 120 min |
1317 reflections with I > 2σ(I) | intensity decay: 1% |
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)] = 0.032 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.086 | H-atom parameters constrained |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0465P)2 + 0.4272P] where P = (Fo2 + 2Fc2)/3 |
1646 reflections | (Δ/σ)max = 0.0001 |
136 parameters | Δρmax = 0.27 e Å−3 |
0 restraints | Δρmin = −0.32 e Å−3 |
C6H7N2O2+·H2PO4− | V = 945.4 (7) Å3 |
Mr = 236.12 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 12.877 (3) Å | µ = 0.30 mm−1 |
b = 4.658 (3) Å | T = 295 K |
c = 15.978 (2) Å | 0.21 × 0.19 × 0.17 mm |
β = 99.43 (3)° |
Enraf–Nonius CAD-4 diffractometer | Rint = 0.013 |
3295 measured reflections | 2 standard reflections every 120 min |
1646 independent reflections | intensity decay: 1% |
1317 reflections with I > 2σ(I) |
R[F2 > 2σ(F2)] = 0.032 | 0 restraints |
wR(F2) = 0.086 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.27 e Å−3 |
1646 reflections | Δρmin = −0.32 e Å−3 |
136 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 | ||
P1 | 0.36597 (3) | 0.04985 (10) | 0.83326 (5) | 0.0235 (3) | |
O1 | 0.25963 (9) | −0.0708 (3) | 0.85358 (11) | 0.0311 (5) | |
H1 | 0.2435 | −0.2157 | 0.8253 | 0.047* | |
O2 | 0.45370 (9) | −0.1750 (3) | 0.86498 (11) | 0.0320 (5) | |
H2 | 0.4428 | −0.3224 | 0.8368 | 0.048* | |
O3 | 0.36107 (10) | 0.0954 (3) | 0.73904 (14) | 0.0301 (6) | |
O4 | 0.39050 (10) | 0.3137 (3) | 0.88724 (11) | 0.0301 (5) | |
O5 | 0.50372 (11) | 0.2632 (4) | 0.57748 (13) | 0.0443 (6) | |
N1 | 0.79601 (11) | 0.0029 (4) | 0.51515 (14) | 0.0299 (6) | |
H1A | 0.8213 | 0.0704 | 0.4726 | 0.036* | |
O6 | 0.53099 (11) | −0.0514 (4) | 0.68426 (12) | 0.0407 (6) | |
H6 | 0.4738 | 0.0078 | 0.6931 | 0.061* | |
C2 | 0.66074 (13) | −0.0149 (4) | 0.59914 (17) | 0.0245 (7) | |
N2 | 0.65346 (12) | 0.2958 (4) | 0.47661 (14) | 0.0352 (6) | |
H2A | 0.6827 | 0.3573 | 0.4354 | 0.042* | |
H2B | 0.5931 | 0.3619 | 0.4837 | 0.042* | |
C1 | 0.70085 (13) | 0.1010 (4) | 0.52881 (16) | 0.0257 (7) | |
C6 | 0.55708 (14) | 0.0821 (4) | 0.61901 (18) | 0.0299 (8) | |
C5 | 0.85289 (14) | −0.1939 (5) | 0.56455 (19) | 0.0359 (8) | |
H5 | 0.9179 | −0.2509 | 0.5521 | 0.043* | |
C3 | 0.71970 (14) | −0.2165 (5) | 0.64914 (17) | 0.0318 (7) | |
H3 | 0.6941 | −0.2926 | 0.6956 | 0.038* | |
C4 | 0.81747 (15) | −0.3097 (5) | 0.63169 (19) | 0.0372 (8) | |
H4 | 0.8566 | −0.4472 | 0.6654 | 0.045* |
U11 | U22 | U33 | U12 | U13 | U23 | |
P1 | 0.02042 (19) | 0.02154 (19) | 0.0302 (9) | −0.00039 (15) | 0.0089 (2) | 0.0020 (2) |
O1 | 0.0264 (6) | 0.0365 (7) | 0.0336 (17) | −0.0095 (5) | 0.0141 (6) | −0.0093 (7) |
O2 | 0.0266 (6) | 0.0235 (6) | 0.0452 (16) | 0.0005 (5) | 0.0037 (6) | 0.0048 (7) |
O3 | 0.0315 (6) | 0.0500 (9) | 0.0118 (18) | 0.0117 (6) | 0.0124 (7) | 0.0124 (9) |
O4 | 0.0345 (6) | 0.0237 (6) | 0.0354 (16) | −0.0055 (5) | 0.0151 (7) | −0.0034 (7) |
O5 | 0.0368 (7) | 0.0500 (9) | 0.0501 (18) | 0.0181 (6) | 0.0190 (8) | 0.0159 (9) |
N1 | 0.0252 (7) | 0.0370 (9) | 0.0306 (19) | 0.0019 (6) | 0.0136 (8) | 0.0003 (9) |
O6 | 0.0332 (7) | 0.0656 (11) | 0.0281 (19) | 0.0147 (7) | 0.0190 (8) | 0.0142 (10) |
C2 | 0.0244 (7) | 0.0343 (9) | 0.016 (2) | 0.0023 (6) | 0.0075 (8) | −0.0010 (9) |
N2 | 0.0319 (8) | 0.0428 (9) | 0.034 (2) | 0.0079 (7) | 0.0154 (8) | 0.0131 (10) |
C1 | 0.0224 (7) | 0.0310 (9) | 0.024 (2) | 0.0004 (6) | 0.0063 (9) | −0.0020 (9) |
C6 | 0.0247 (8) | 0.0375 (10) | 0.029 (3) | 0.0024 (7) | 0.0078 (9) | −0.0027 (11) |
C5 | 0.0236 (8) | 0.0451 (11) | 0.039 (3) | 0.0068 (7) | 0.0065 (10) | 0.0005 (12) |
C3 | 0.0307 (8) | 0.0442 (11) | 0.022 (2) | 0.0048 (8) | 0.0078 (9) | 0.0059 (11) |
C4 | 0.0297 (9) | 0.0507 (13) | 0.031 (3) | 0.0112 (9) | 0.0041 (11) | 0.0076 (13) |
P1—O1 | 1.5627 (14) | C2—C3 | 1.377 (3) |
P1—O2 | 1.5628 (14) | C2—C1 | 1.418 (3) |
P1—O3 | 1.511 (2) | C2—C6 | 1.492 (3) |
P1—O4 | 1.5049 (16) | N2—C1 | 1.313 (3) |
O1—H1 | 0.8200 | N2—H2A | 0.8600 |
O2—H2 | 0.8200 | N2—H2B | 0.8600 |
O5—C6 | 1.214 (3) | C5—C4 | 1.346 (4) |
N1—C5 | 1.346 (3) | C5—H5 | 0.9300 |
N1—C1 | 1.358 (2) | C3—C4 | 1.402 (3) |
N1—H1A | 0.8600 | C3—H3 | 0.9300 |
O6—C6 | 1.304 (3) | C4—H4 | 0.9300 |
O6—H6 | 0.8200 | ||
O4—P1—O3 | 115.27 (10) | H2A—N2—H2B | 120.0 |
O4—P1—O1 | 106.46 (9) | N2—C1—N1 | 117.9 (2) |
O3—P1—O1 | 111.25 (9) | N2—C1—C2 | 125.07 (17) |
O4—P1—O2 | 106.78 (9) | N1—C1—C2 | 117.04 (18) |
O3—P1—O2 | 109.09 (9) | O5—C6—O6 | 124.83 (19) |
O1—P1—O2 | 107.64 (9) | O5—C6—C2 | 122.7 (2) |
P1—O1—H1 | 109.5 | O6—C6—C2 | 112.48 (18) |
P1—O2—H2 | 109.5 | C4—C5—N1 | 121.19 (19) |
C5—N1—C1 | 123.6 (2) | C4—C5—H5 | 119.4 |
C5—N1—H1A | 118.2 | N1—C5—H5 | 119.4 |
C1—N1—H1A | 118.2 | C2—C3—C4 | 121.6 (2) |
C6—O6—H6 | 109.5 | C2—C3—H3 | 119.2 |
C3—C2—C1 | 118.77 (18) | C4—C3—H3 | 119.2 |
C3—C2—C6 | 120.7 (2) | C5—C4—C3 | 117.8 (2) |
C1—C2—C6 | 120.53 (19) | C5—C4—H4 | 121.1 |
C1—N2—H2A | 120.0 | C3—C4—H4 | 121.1 |
C1—N2—H2B | 120.0 |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O3i | 0.82 | 1.79 | 2.504 (3) | 145 |
O2—H2···O4ii | 0.82 | 2.04 | 2.560 (3) | 121 |
O6—H6···O3 | 0.82 | 1.78 | 2.579 (3) | 165 |
N1—H1A···O4iii | 0.86 | 1.83 | 2.684 (3) | 173 |
N2—H2A···O1iii | 0.86 | 2.03 | 2.873 (3) | 169 |
N2—H2B···O5 | 0.86 | 2.09 | 2.712 (3) | 129 |
N2—H2B···O5iv | 0.86 | 2.27 | 2.914 (3) | 132 |
C3—H3···O6 | 0.93 | 2.36 | 2.694 (3) | 101 |
C5—H5···O4v | 0.93 | 2.52 | 3.268 (3) | 138 |
Symmetry codes: (i) −x+1/2, y−1/2, −z+3/2; (ii) x, y−1, z; (iii) x+1/2, −y+1/2, z−1/2; (iv) −x+1, −y+1, −z+1; (v) −x+3/2, y−1/2, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | C6H7N2O2+·H2PO4− |
Mr | 236.12 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 295 |
a, b, c (Å) | 12.877 (3), 4.658 (3), 15.978 (2) |
β (°) | 99.43 (3) |
V (Å3) | 945.4 (7) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.30 |
Crystal size (mm) | 0.21 × 0.19 × 0.17 |
Data collection | |
Diffractometer | Enraf–Nonius CAD-4 |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 3295, 1646, 1317 |
Rint | 0.013 |
(sin θ/λ)max (Å−1) | 0.703 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.032, 0.086, 1.04 |
No. of reflections | 1646 |
No. of parameters | 136 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.27, −0.32 |
Computer programs: CAD-4 EXPRESS (Enraf–Nonius, 1994), CAD-4 EXPRESS, XCAD4 (Harms & Wocadlo, 1995), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), ORTEP-3 for Windows (Farrugia, 1997), WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O3i | 0.820 | 1.786 | 2.504 (3) | 145.30 |
O2—H2···O4ii | 0.820 | 2.038 | 2.560 (3) | 121.19 |
O6—H6···O3 | 0.820 | 1.778 | 2.579 (3) | 164.82 |
N1—H1A···O4iii | 0.860 | 1.829 | 2.684 (3) | 172.49 |
N2—H2A···O1iii | 0.860 | 2.025 | 2.873 (3) | 168.51 |
N2—H2B···O5 | 0.860 | 2.086 | 2.712 (3) | 129.20 |
N2—H2B···O5iv | 0.860 | 2.271 | 2.914 (3) | 131.53 |
C3—H3···O6 | 0.9300 | 2.3600 | 2.694 (3) | 101.00 |
C5—H5···O4v | 0.9300 | 2.5200 | 3.268 (3) | 138.00 |
Symmetry codes: (i) −x+1/2, y−1/2, −z+3/2; (ii) x, y−1, z; (iii) x+1/2, −y+1/2, z−1/2; (iv) −x+1, −y+1, −z+1; (v) −x+3/2, y−1/2, −z+3/2. |
Intermolecular and intramolecular H-bonds constitute an important factor to understand and interprate the properties of biological and pharmacological materials. For that purpose, organic phosphate could be used as interesting models. In the presence of organic cations, the formation of (H2PO4–)n polyanions is observed. These polymeric anions could provide interesting supramolecular networks with a variety of novel structural features (Blessing, (1986); Adams, (1977); Desiraju, (1989) and (1995)).
As part of our study of organic cation monophosphate, we have synthesized a new compound,2-amino-3-nicotinium acid dihydrogenmonophosphate (I). The formula unit (I) constitute the assymetric unit which is built of one (H2PO4)- anion and one (C5N2H6CO2H)+ cation (Fig. 1).
The main geometrical features of anions and cations are reported in table 1. The monophosphate anions have slightly distorted tetrahedral geometry, with the P—O bond lengths ranging from 1.5049 (16)–1.5628 (14)Å and the O—P—O angles ranging from 106.46 (9)–115.27 (10)°. As expected, the geometric parameters of the H2PO4- anion agree with those previously observed for monophosphate polyanions with no internal symmetry (Hebert, (1978); Masse and Durif, (1990)).
The H2P O4- tetrahedra are interconnected by strong hydrogen bonds in way to form infinite ribbons extending along the b axis. These ribbons, which are organized in planes parallel to (101), are interconnected by the organic molecules so to form thick layers of hybrid organic-inorganic entities parallel to the (10–1) plane (Fig. 2). These entities manifest multiple hydtogen bonds of types N—H···O, O—H···O and C—H···O to keep up the network cohesion.
Each H2PO4 group is linked to four adjacent phosphoric groups by two donors and two acceptors strong hydrogen bonds in which the corresponding O···O distances lie in the range 2.504 (3)–2.560 (3) Å on one side, and to two organic cations by three acceptors weak hydrogen bonds on the other side.
The hydrogen atoms belonging to NH2 groups participate in addition in intramolecular interaction with N2—H2B···O5 = 2.086 Å distance to maintain the cohesion of organic cations.