organic compounds
1-Ethyl-N′-[(E)-4-hydroxybenzylidene]-7-methyl-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carbohydrazide
aApplied Chemistry Research Centre, PCSIR Laboratories Complex, Ferozpure Road, Lahore 54600, Pakistan, bDepartment of Chemistry, Islamia University, Bahawalpur, Pakistan, cDepartment of Physics, Sakarya University, Sakarya, Turkey, and dDepartment of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey
*Correspondence e-mail: farahdeeba.pcsir@gmail.com
In the 19H18N4O3, the fused-ring system is essentially planar [maximum deviation is 0.031 (2) Å] while the dihedral angle between the ring system and the benzene ring is 12.64 (6)°.The carbohydrazide H atom is involved in an intramolecular N—H⋯O hydrogen bond, forming a six-membered hydrogen-bonded ring. The molecules arrange themselves into centrosymmetric dimers by means of intermolecular O—H⋯O hydrogen bonds.
of the title compound, CRelated literature
For the synthesis of et al. (2001); Zia-ur-Rehman et al. (2006, 2009). For their biological activity, see: Ferrarini et al. (2000); Gavrilova & Bosnich (2004); Goswami & Mukherjee (1997); Hoock et al. (1999); Mintert & Sheldrick (1995); Nakatani et al. (2000); Nakataniz et al. (2001); Roma et al. (2000). For similar molecules, see: Catalano et al. (2000).
see: ChenExperimental
Crystal data
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Refinement
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Data collection: CrystalClear (Rigaku/MSC, 2005); cell CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
10.1107/S1600536809009167/ng2560sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536809009167/ng2560Isup2.hkl
A mixture of 1-ethyl-7-methyl-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carbohydrazide (10.0 mmoles; 2.46 g), 4-hydroxy benzaldehyde (11.0 mmoles; 1.34 g), ortho phosphoric acid (2 drops) and ethyl alcohol (20.0 ml) was refluxed for a period of two hours. After completion of the reaction as indicated by TLC, three fourth of the solvent was evaporated and the contents were cooled to room temperature. Crystals obtained were washed with cold ethanol and dried; Yield: 92%.
H atoms were placed in geometrically idealized positions (C—H = 0.93–0.98 Å, O—H=0.82 Å) and treated as riding, with Uiso(H)=1.2Ueq(C) (for methine and methylene) or 1.5Ueq (methyl and hydroxyl). The N3 and C13 H atoms were located in a difference Fourier map
Data collection: CrystalClear (Rigaku/MSC, 2005); cell
CrystalClear (Rigaku/MSC, 2005); data reduction: CrystalClear (Rigaku/MSC, 2005); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).Fig. 1. An ORTEP-3 (Farrugia, 1997) drawing of the title molecule with the atom-numbering scheme. The displacement ellipsoids are drawn at the 50% probability level. |
C19H18N4O3 | F(000) = 736 |
Mr = 350.37 | Dx = 1.34 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 3643 reflections |
a = 7.6437 (2) Å | θ = 2.4–26.4° |
b = 13.3290 (2) Å | µ = 0.09 mm−1 |
c = 17.2212 (4) Å | T = 293 K |
β = 98.1745 (14)° | Prism, light yellow |
V = 1736.72 (7) Å3 | 0.2 × 0.14 × 0.1 mm |
Z = 4 |
Rigaku R-AXIS RAPID-S diffractometer | 3583 independent reflections |
Graphite monochromator | 2597 reflections with I > 2σ(I) |
Detector resolution: 10.0000 pixels mm-1 | Rint = 0.064 |
ω scans | θmax = 26.7°, θmin = 2.4° |
Absorption correction: multi-scan (Blessing, 1995) | h = −8→9 |
Tmin = 0.990, Tmax = 0.991 | k = −16→16 |
35553 measured reflections | l = −21→21 |
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)] = 0.056 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.151 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0654P)2 + 0.3979P] where P = (Fo2 + 2Fc2)/3 |
3583 reflections | (Δ/σ)max < 0.001 |
244 parameters | Δρmax = 0.15 e Å−3 |
0 restraints | Δρmin = −0.16 e Å−3 |
C19H18N4O3 | V = 1736.72 (7) Å3 |
Mr = 350.37 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 7.6437 (2) Å | µ = 0.09 mm−1 |
b = 13.3290 (2) Å | T = 293 K |
c = 17.2212 (4) Å | 0.2 × 0.14 × 0.1 mm |
β = 98.1745 (14)° |
Rigaku R-AXIS RAPID-S diffractometer | 3583 independent reflections |
Absorption correction: multi-scan (Blessing, 1995) | 2597 reflections with I > 2σ(I) |
Tmin = 0.990, Tmax = 0.991 | Rint = 0.064 |
35553 measured reflections |
R[F2 > 2σ(F2)] = 0.056 | 0 restraints |
wR(F2) = 0.151 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | Δρmax = 0.15 e Å−3 |
3583 reflections | Δρmin = −0.16 e Å−3 |
244 parameters |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 > 2σ(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 | ||
O1 | 0.2080 (2) | 0.01852 (11) | 0.57270 (8) | 0.0654 (4) | |
O3 | −0.1795 (2) | −0.65000 (11) | 0.71180 (9) | 0.0686 (4) | |
H3O | −0.1729 | −0.6919 | 0.6775 | 0.103* | |
N1 | 0.4591 (2) | 0.22498 (12) | 0.39012 (10) | 0.0556 (4) | |
N3 | 0.1243 (2) | −0.16773 (13) | 0.52592 (10) | 0.0554 (4) | |
N4 | 0.0658 (2) | −0.26173 (12) | 0.54348 (10) | 0.0554 (4) | |
O2 | 0.1598 (2) | −0.20967 (11) | 0.40138 (9) | 0.0750 (5) | |
N2 | 0.3819 (2) | 0.05987 (12) | 0.36073 (9) | 0.0532 (4) | |
C17 | −0.1341 (3) | −0.55811 (15) | 0.68611 (11) | 0.0524 (5) | |
C14 | −0.0321 (3) | −0.36963 (14) | 0.63803 (11) | 0.0517 (5) | |
C11 | 0.2538 (3) | 0.03007 (14) | 0.50649 (11) | 0.0505 (5) | |
C10 | 0.2423 (3) | −0.04590 (14) | 0.44689 (11) | 0.0493 (5) | |
C16 | −0.1130 (3) | −0.54200 (15) | 0.60834 (11) | 0.0567 (5) | |
H16 | −0.1315 | −0.594 | 0.5721 | 0.068* | |
C9 | 0.3081 (3) | −0.02682 (15) | 0.37834 (12) | 0.0544 (5) | |
H9 | 0.3009 | −0.0779 | 0.3413 | 0.065* | |
C13 | 0.0289 (3) | −0.27273 (16) | 0.61292 (12) | 0.0561 (5) | |
C15 | −0.0647 (3) | −0.44868 (15) | 0.58534 (11) | 0.0590 (5) | |
H15 | −0.0533 | −0.438 | 0.5329 | 0.071* | |
C6 | 0.3892 (3) | 0.13908 (14) | 0.41286 (11) | 0.0494 (5) | |
C18 | −0.1077 (3) | −0.48014 (16) | 0.73924 (11) | 0.0580 (5) | |
H18 | −0.1243 | −0.4903 | 0.7911 | 0.07* | |
C5 | 0.3272 (3) | 0.12561 (14) | 0.48473 (11) | 0.0500 (5) | |
C2 | 0.4702 (3) | 0.30211 (15) | 0.43905 (13) | 0.0586 (5) | |
C12 | 0.1715 (3) | −0.14835 (14) | 0.45515 (12) | 0.0539 (5) | |
C19 | −0.0567 (3) | −0.38686 (15) | 0.71523 (11) | 0.0562 (5) | |
H19 | −0.0385 | −0.3348 | 0.7515 | 0.067* | |
C1 | 0.5445 (3) | 0.39767 (17) | 0.41103 (15) | 0.0736 (7) | |
H1A | 0.5764 | 0.3875 | 0.3597 | 0.11* | |
H1C | 0.6474 | 0.4168 | 0.4466 | 0.11* | |
H1B | 0.4573 | 0.4498 | 0.4089 | 0.11* | |
C4 | 0.3414 (3) | 0.20843 (16) | 0.53477 (13) | 0.0648 (6) | |
H4 | 0.3023 | 0.2041 | 0.5834 | 0.078* | |
C3 | 0.4127 (4) | 0.29585 (17) | 0.51221 (13) | 0.0716 (6) | |
H3 | 0.4229 | 0.3511 | 0.5456 | 0.086* | |
C7 | 0.4608 (3) | 0.06988 (18) | 0.28730 (12) | 0.0679 (6) | |
H7A | 0.4911 | 0.0038 | 0.2698 | 0.082* | |
H7B | 0.5691 | 0.1086 | 0.2979 | 0.082* | |
C8 | 0.3387 (4) | 0.1199 (3) | 0.22344 (15) | 0.1028 (10) | |
H8B | 0.3956 | 0.1254 | 0.1774 | 0.154* | |
H8C | 0.3093 | 0.1857 | 0.2403 | 0.154* | |
H8A | 0.2328 | 0.0808 | 0.2116 | 0.154* | |
H13 | 0.045 (3) | −0.2191 (17) | 0.6511 (13) | 0.067 (6)* | |
H3N | 0.131 (3) | −0.1174 (17) | 0.5616 (13) | 0.070 (7)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0978 (11) | 0.0566 (9) | 0.0456 (8) | −0.0032 (8) | 0.0238 (8) | 0.0018 (6) |
O3 | 0.1010 (12) | 0.0523 (8) | 0.0579 (9) | −0.0040 (8) | 0.0296 (9) | 0.0053 (7) |
N1 | 0.0569 (10) | 0.0537 (10) | 0.0566 (10) | −0.0026 (8) | 0.0098 (8) | 0.0042 (8) |
N3 | 0.0732 (11) | 0.0448 (9) | 0.0499 (10) | −0.0026 (8) | 0.0139 (8) | 0.0024 (8) |
N4 | 0.0676 (11) | 0.0446 (9) | 0.0551 (10) | −0.0016 (8) | 0.0125 (8) | 0.0040 (7) |
O2 | 0.1160 (14) | 0.0533 (9) | 0.0596 (9) | −0.0130 (8) | 0.0259 (9) | −0.0086 (7) |
N2 | 0.0632 (10) | 0.0529 (9) | 0.0466 (9) | −0.0036 (8) | 0.0186 (7) | −0.0010 (7) |
C17 | 0.0623 (12) | 0.0483 (11) | 0.0491 (11) | 0.0007 (9) | 0.0159 (9) | 0.0051 (8) |
C14 | 0.0608 (12) | 0.0479 (10) | 0.0481 (11) | −0.0006 (9) | 0.0131 (9) | 0.0019 (8) |
C11 | 0.0581 (12) | 0.0503 (11) | 0.0436 (10) | 0.0056 (9) | 0.0093 (8) | 0.0023 (8) |
C10 | 0.0561 (11) | 0.0473 (10) | 0.0452 (10) | 0.0009 (8) | 0.0090 (8) | 0.0025 (8) |
C16 | 0.0767 (14) | 0.0502 (11) | 0.0454 (11) | −0.0023 (10) | 0.0165 (10) | −0.0024 (8) |
C9 | 0.0658 (13) | 0.0496 (11) | 0.0492 (11) | −0.0001 (9) | 0.0132 (9) | −0.0043 (9) |
C13 | 0.0698 (14) | 0.0492 (11) | 0.0507 (12) | 0.0003 (10) | 0.0130 (10) | −0.0005 (9) |
C15 | 0.0837 (15) | 0.0531 (12) | 0.0438 (11) | −0.0039 (10) | 0.0210 (10) | 0.0011 (9) |
C6 | 0.0526 (11) | 0.0486 (10) | 0.0472 (10) | 0.0016 (8) | 0.0082 (8) | 0.0019 (8) |
C18 | 0.0748 (14) | 0.0598 (12) | 0.0422 (10) | 0.0000 (10) | 0.0186 (9) | 0.0041 (9) |
C5 | 0.0579 (11) | 0.0487 (11) | 0.0439 (10) | 0.0003 (9) | 0.0084 (8) | 0.0012 (8) |
C2 | 0.0617 (13) | 0.0507 (12) | 0.0619 (13) | −0.0030 (9) | 0.0038 (10) | 0.0032 (10) |
C12 | 0.0644 (13) | 0.0476 (11) | 0.0505 (11) | 0.0016 (9) | 0.0109 (9) | −0.0002 (9) |
C19 | 0.0724 (13) | 0.0526 (11) | 0.0454 (10) | −0.0008 (10) | 0.0143 (9) | −0.0043 (9) |
C1 | 0.0827 (16) | 0.0550 (13) | 0.0837 (17) | −0.0096 (11) | 0.0138 (13) | 0.0068 (12) |
C4 | 0.0901 (16) | 0.0577 (13) | 0.0476 (11) | −0.0027 (11) | 0.0130 (11) | −0.0034 (9) |
C3 | 0.1043 (19) | 0.0523 (12) | 0.0586 (13) | −0.0098 (12) | 0.0126 (12) | −0.0079 (10) |
C7 | 0.0866 (16) | 0.0671 (14) | 0.0573 (13) | −0.0084 (12) | 0.0348 (12) | −0.0037 (10) |
C8 | 0.111 (2) | 0.144 (3) | 0.0552 (15) | −0.011 (2) | 0.0182 (15) | 0.0164 (17) |
O1—C11 | 1.249 (2) | C16—H16 | 0.93 |
O3—C17 | 1.364 (2) | C9—H9 | 0.93 |
O3—H3O | 0.82 | C13—H13 | 0.97 (2) |
N1—C2 | 1.324 (3) | C15—H15 | 0.93 |
N1—C6 | 1.345 (2) | C6—C5 | 1.398 (3) |
N3—C12 | 1.344 (3) | C18—C19 | 1.384 (3) |
N3—N4 | 1.378 (2) | C18—H18 | 0.93 |
N3—H3N | 0.91 (2) | C5—C4 | 1.395 (3) |
N4—C13 | 1.275 (3) | C2—C3 | 1.394 (3) |
O2—C12 | 1.229 (2) | C2—C1 | 1.502 (3) |
N2—C9 | 1.340 (3) | C19—H19 | 0.93 |
N2—C6 | 1.382 (2) | C1—H1A | 0.96 |
N2—C7 | 1.482 (2) | C1—H1C | 0.96 |
C17—C18 | 1.380 (3) | C1—H1B | 0.96 |
C17—C16 | 1.388 (3) | C4—C3 | 1.366 (3) |
C14—C19 | 1.388 (3) | C4—H4 | 0.93 |
C14—C15 | 1.390 (3) | C3—H3 | 0.93 |
C14—C13 | 1.460 (3) | C7—C8 | 1.495 (4) |
C11—C10 | 1.436 (3) | C7—H7A | 0.97 |
C11—C5 | 1.462 (3) | C7—H7B | 0.97 |
C10—C9 | 1.371 (3) | C8—H8B | 0.96 |
C10—C12 | 1.483 (3) | C8—H8C | 0.96 |
C16—C15 | 1.372 (3) | C8—H8A | 0.96 |
C17—O3—H3O | 109.5 | C19—C18—H18 | 120 |
C2—N1—C6 | 117.86 (17) | C4—C5—C6 | 116.04 (18) |
C12—N3—N4 | 120.71 (17) | C4—C5—C11 | 121.99 (18) |
C12—N3—H3N | 118.4 (15) | C6—C5—C11 | 121.97 (17) |
N4—N3—H3N | 120.9 (14) | N1—C2—C3 | 121.92 (19) |
C13—N4—N3 | 115.59 (17) | N1—C2—C1 | 116.5 (2) |
C9—N2—C6 | 119.42 (16) | C3—C2—C1 | 121.5 (2) |
C9—N2—C7 | 120.42 (17) | O2—C12—N3 | 123.72 (19) |
C6—N2—C7 | 120.13 (16) | O2—C12—C10 | 121.92 (18) |
O3—C17—C18 | 118.75 (17) | N3—C12—C10 | 114.36 (17) |
O3—C17—C16 | 121.44 (18) | C18—C19—C14 | 121.14 (19) |
C18—C17—C16 | 119.80 (18) | C18—C19—H19 | 119.4 |
C19—C14—C15 | 117.65 (18) | C14—C19—H19 | 119.4 |
C19—C14—C13 | 121.51 (18) | C2—C1—H1A | 109.5 |
C15—C14—C13 | 120.84 (18) | C2—C1—H1C | 109.5 |
O1—C11—C10 | 124.68 (18) | H1A—C1—H1C | 109.5 |
O1—C11—C5 | 120.61 (18) | C2—C1—H1B | 109.5 |
C10—C11—C5 | 114.70 (16) | H1A—C1—H1B | 109.5 |
C9—C10—C11 | 119.47 (18) | H1C—C1—H1B | 109.5 |
C9—C10—C12 | 115.90 (17) | C3—C4—C5 | 119.9 (2) |
C11—C10—C12 | 124.54 (17) | C3—C4—H4 | 120.1 |
C15—C16—C17 | 119.46 (18) | C5—C4—H4 | 120.1 |
C15—C16—H16 | 120.3 | C4—C3—C2 | 119.8 (2) |
C17—C16—H16 | 120.3 | C4—C3—H3 | 120.1 |
N2—C9—C10 | 124.95 (18) | C2—C3—H3 | 120.1 |
N2—C9—H9 | 117.5 | N2—C7—C8 | 112.4 (2) |
C10—C9—H9 | 117.5 | N2—C7—H7A | 109.1 |
N4—C13—C14 | 120.13 (19) | C8—C7—H7A | 109.1 |
N4—C13—H13 | 121.9 (13) | N2—C7—H7B | 109.1 |
C14—C13—H13 | 117.9 (13) | C8—C7—H7B | 109.1 |
C16—C15—C14 | 121.96 (18) | H7A—C7—H7B | 107.9 |
C16—C15—H15 | 119 | C7—C8—H8B | 109.5 |
C14—C15—H15 | 119 | C7—C8—H8C | 109.5 |
N1—C6—N2 | 116.22 (17) | H8B—C8—H8C | 109.5 |
N1—C6—C5 | 124.45 (18) | C7—C8—H8A | 109.5 |
N2—C6—C5 | 119.32 (17) | H8B—C8—H8A | 109.5 |
C17—C18—C19 | 119.94 (18) | H8C—C8—H8A | 109.5 |
C17—C18—H18 | 120 | ||
C12—N3—N4—C13 | 178.2 (2) | N2—C6—C5—C4 | 179.03 (18) |
O1—C11—C10—C9 | −175.46 (19) | N1—C6—C5—C11 | −179.47 (18) |
C5—C11—C10—C9 | 3.8 (3) | N2—C6—C5—C11 | −0.3 (3) |
O1—C11—C10—C12 | 1.1 (3) | O1—C11—C5—C4 | −3.1 (3) |
C5—C11—C10—C12 | −179.61 (18) | C10—C11—C5—C4 | 177.57 (19) |
O3—C17—C16—C15 | −179.0 (2) | O1—C11—C5—C6 | 176.24 (19) |
C18—C17—C16—C15 | 0.5 (3) | C10—C11—C5—C6 | −3.1 (3) |
C6—N2—C9—C10 | −2.4 (3) | C6—N1—C2—C3 | 0.3 (3) |
C7—N2—C9—C10 | 175.4 (2) | C6—N1—C2—C1 | −178.45 (19) |
C11—C10—C9—N2 | −1.3 (3) | N4—N3—C12—O2 | 3.0 (3) |
C12—C10—C9—N2 | −178.10 (19) | N4—N3—C12—C10 | −176.28 (17) |
N3—N4—C13—C14 | −179.25 (18) | C9—C10—C12—O2 | −5.6 (3) |
C19—C14—C13—N4 | 173.6 (2) | C11—C10—C12—O2 | 177.8 (2) |
C15—C14—C13—N4 | −5.2 (3) | C9—C10—C12—N3 | 173.73 (18) |
C17—C16—C15—C14 | 1.4 (3) | C11—C10—C12—N3 | −2.9 (3) |
C19—C14—C15—C16 | −2.4 (3) | C17—C18—C19—C14 | 0.4 (3) |
C13—C14—C15—C16 | 176.5 (2) | C15—C14—C19—C18 | 1.5 (3) |
C2—N1—C6—N2 | −179.19 (17) | C13—C14—C19—C18 | −177.4 (2) |
C2—N1—C6—C5 | 0.0 (3) | C6—C5—C4—C3 | −0.1 (3) |
C9—N2—C6—N1 | −177.63 (18) | C11—C5—C4—C3 | 179.3 (2) |
C7—N2—C6—N1 | 4.5 (3) | C5—C4—C3—C2 | 0.4 (4) |
C9—N2—C6—C5 | 3.2 (3) | N1—C2—C3—C4 | −0.5 (4) |
C7—N2—C6—C5 | −174.73 (19) | C1—C2—C3—C4 | 178.2 (2) |
O3—C17—C18—C19 | 178.2 (2) | C9—N2—C7—C8 | 98.6 (3) |
C16—C17—C18—C19 | −1.4 (3) | C6—N2—C7—C8 | −83.5 (3) |
N1—C6—C5—C4 | −0.1 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3N···O1 | 0.91 (2) | 1.91 (2) | 2.660 (3) | 139 (2) |
O3—H3O···O2i | 0.82 | 1.90 | 2.721 (3) | 179 |
Symmetry code: (i) −x, −y−1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C19H18N4O3 |
Mr | 350.37 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 7.6437 (2), 13.3290 (2), 17.2212 (4) |
β (°) | 98.1745 (14) |
V (Å3) | 1736.72 (7) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.2 × 0.14 × 0.1 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID-S diffractometer |
Absorption correction | Multi-scan (Blessing, 1995) |
Tmin, Tmax | 0.990, 0.991 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 35553, 3583, 2597 |
Rint | 0.064 |
(sin θ/λ)max (Å−1) | 0.631 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.056, 0.151, 1.04 |
No. of reflections | 3583 |
No. of parameters | 244 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.15, −0.16 |
Computer programs: CrystalClear (Rigaku/MSC, 2005), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997), WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3N···O1 | 0.91 (2) | 1.91 (2) | 2.660 (3) | 139 (2) |
O3—H3O···O2i | 0.82 | 1.9000 | 2.721 (3) | 179.00 |
Symmetry code: (i) −x, −y−1, −z+1. |
Acknowledgements
The authors are indebted to the Department of Chemistry, Atatürk University, Turkey, for the use of the X-ray diffractometer purchased under grant No. 2003/219 from the University Research Fund.
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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.
Derivatives of 1,8-naphthyridine have been investigated since a long ago due to their interesting complexation properties and medical uses. Such compounds are known to possess antibacterial (Chen et al., 2001), anti-inflammatory (Roma et al., 2000), anti-hypertensive, and anti-platelet activities (Ferrarini et al., 2000). These have also been widely utilized as molecular recognition receptors for urea, carboxylic acids and guanine (Goswami et al., 1997; Nakatani et al., 2000). Few 1,8-naphthyridine derivatives have been reported to be excellent fluorescent markers of nucleic acids (Hoock et al., 1999) and probe molecules (Nakataniz et al., 2001). In addition, these have received much attention due to the possibility of their linkage with metals in several coordination modes such as monodentate, chelating bidentate, and dinuclear bridging binding fashion (Gavrilova & Bosnich, 2004; Mintert & Sheldrick, 1995).
In continuation of our work on the synthesis, biological activity and crystal structures of various heterocyclic compounds (Zia-ur-Rehman et al., 2006; Zia-ur-Rehman et al., 2009), we herein report the synthesis and crystal structure of the title compound (I) (Scheme and figure 1). The structure of the basic naphthyridine ring consisting of two adjoined pyridine rings is planar while carbonyl oxygen O1 on C11 is involved in intramolecular hydrogen bonding giving rise to a six-membered hydrogen bond ring (Table 1). All bond distances are essentially identical to those found in the literature (Catalano et al., 2000).The molecules form centrosymmetric dimers through intermolecular O—H···O hydrogen bonds.