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Crystal structure of 2-hydroxy-4-methoxy benzaldehyde, C8H8O3

  • Lubabalo Ndima , Eric C. Hosten ORCID logo and Richard Betz ORCID logo EMAIL logo
Published/Copyright: October 2, 2020
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Zeitschrift für Kristallographie - New Crystal Structures
From the journal Zeitschrift für Kristallographie - New Crystal Structures Volume 236 Issue 1

Abstract

C8H8O3, monoclinic, P21/c (no. 14), a = 6.3037(3) Å, b = 33.102(2) Å, c = 7.0471(4) Å, β = 102.105(3)°, V = 1437.79(14) Å3, Z = 8, Rgt(F) = 0.0433, wRref(F2) = 0.1087, T = 200 K.

CCDC no.: 2033280

The molecular structure is shown in the Figure. Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal:Colourless platelet
Size:0.30 × 0.24 × 0.13 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:0.11 mm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
θmax, completeness:28.3°, >99%
N(hkl)measured, N(hkl)unique, Rint:13,163, 3573, 0.022
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 2615
N(param)refined:203
Programs:Bruker [1], SHELX [2], WinGX/ORTEP [3], Mercury [4], PLATON [5]
Table 2:

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2).

AtomxyzUiso*/Ueq
O120.77169 (16)0.28241 (3)0.08257 (17)0.0398 (3)
H120.72830.30650.07340.060*
O140.48916 (17)0.14855 (3)0.00827 (17)0.0434 (3)
O170.48032 (19)0.34135 (3)0.00634 (19)0.0490 (3)
C110.3874 (2)0.27195 (4)−0.0196 (2)0.0298 (3)
C120.6001 (2)0.25733 (4)0.0377 (2)0.0286 (3)
C130.6403 (2)0.21605 (4)0.0493 (2)0.0312 (3)
H130.78440.20620.08900.037*
C140.4679 (2)0.18941 (4)0.0021 (2)0.0309 (3)
C150.2550 (2)0.20339 (5)−0.0570 (2)0.0348 (3)
H150.13810.1848−0.09010.042*
C160.2174 (2)0.24405 (4)−0.0666 (2)0.0333 (3)
H160.07270.2536−0.10590.040*
C170.3431 (2)0.31454 (5)−0.0302 (2)0.0394 (4)
H170.19570.3226−0.06860.047*
C180.7010 (3)0.13191 (5)0.0691 (3)0.0584 (5)
H18A0.79320.1411−0.01840.088*
H18B0.69200.10240.06590.088*
H18C0.76340.14090.20160.088*
O220.67480 (16)0.06923 (3)0.60077 (18)0.0448 (3)
H220.71370.09330.59040.067*
O240.98216 (16)−0.05922 (3)0.79910 (16)0.0390 (3)
O270.95097 (19)0.12924 (3)0.61272 (19)0.0509 (3)
C211.0611 (2)0.06257 (4)0.70486 (19)0.0291 (3)
C220.8508 (2)0.04615 (4)0.6675 (2)0.0296 (3)
C230.8181 (2)0.00532 (4)0.6970 (2)0.0305 (3)
H230.6756−0.00560.67060.037*
C240.9950 (2)−0.01916 (4)0.76523 (19)0.0290 (3)
C251.2062 (2)−0.00340 (4)0.8040 (2)0.0331 (3)
H251.3269−0.02040.85130.040*
C261.2365 (2)0.03665 (4)0.7729 (2)0.0321 (3)
H261.37980.04720.79790.039*
C271.0962 (2)0.10476 (5)0.6722 (2)0.0374 (3)
H271.24160.11430.69850.045*
C280.7724 (3)−0.07775 (5)0.7640 (2)0.0413 (4)
H28A0.6841−0.06510.84670.062*
H28B0.7881−0.10670.79380.062*
H28C0.7014−0.07420.62740.062*

Source of material

The compound was obtained commercially (Aldrich). Crystals suitable for the diffraction study were taken directly from the provided product.

Experimental details

Carbon-bound H atoms were placed in calculated positions (C–H 0.95 Å for aromatic and vinylic carbon atoms) and were included in the refinement in the riding model approximation, with U(H) set to 1.2 Ueq(C).

The H atoms of the methyl group were allowed to rotate with a fixed angle around the C–C bond to best fit the experimental electron density (HFIX 137) in the SHELX program suite [2], with U(H) set to 1.5 Ueq(C).

The H atom of the hydroxyl group was allowed to rotate with a fixed angle around the C–O bond to best fit the experimental electron density (HFIX 147) in the SHELX program suite [2], with U(H) set to 1.5 Ueq(O).

Comment

Chelate ligands have found widespread use in coordination chemistry due to the increased stability of coordination compounds they can form in comparison to monodentate ligands [6]. Hydroxycarboxylic acids are particularly interesting in this aspect as they offer two hydroxyl groups of markedly different acidity as potential bonding partners. Upon varying the substitution pattern on the hydrocarbon backbone, the acidity of the respective hydroxyl groups can be finetuned over a wide range and they may, thus, serve as probes for establishing the rules in which pKa range coordination to various central atoms can be observed. Mandelic acids are especially versatile in this context as their aromatic moiety can be functionalized by means of various substituents at a sheer limitless scale. Mandelic acids are easily synthesized upon acidic hydrolysis of their pertaining cyanohydrines that – in turn – are accessible in good yield by the acid-catalyzed addition of hydrocyanic acid to the parent aldehyde [7]. To allow for a more detailed comparison of metrical parameters of the mandelic acid derived from 2-hydroxy-4-methoxy benzaldehyde in envisioned coordination compounds, the crystal and molecular structure of the parent benzaldehyde was determined as a first step. The molecular and crystal structures of 4-methoxy-benzaldehyde and 2-hydroxy-benzaldehyde have been reported earlier [8].

The title compound is a two-fold-substituted derivative of benzladehyde featuring a hydroxy-group in ortho-position and a methoxy-group in para-position as substituents on the aromatic system. The asymmetric unit comprises two complete molecules which differ only in a slightly more tilted-out-of-plane methoxy group. All bond lengths are in good agreement with values reported for comparable structures whose values have been deposited with the Cambridge Structural Database [9]. The respective non-hydrogen atoms of each molecule are almost co-planar with the largest deviation from the least-squares planes as defined by them found at 0.018(2) Å for the first molecule and only – 0.006(1) Å for the second molecule present in the asymmetric unit. This finding can be rationalized by assuming resonance involving all substituents on the aromatic system. The least-squares planes as defined by the carbon atoms of the individual phenyl rings intersect at an angle of 11.46(4)°.

In the crystal, classical hydrogen bonds of the O–H…O type are observed next to C–H…O contacts whose range falls by more than 0.1 Å below the sum of van-der-Waals radii of the participating atoms. Each hydroxyl group supports a bifurcated classical hydrogen bond with one bond being intramolecular towards the oxygen atom of the formyl group as acceptor and the other bond being intermolecular towards the keto-type oxygen atom of the formyl group, thus denoting the latter atom as two-fold acceptor. The result is the formation of almost centrosymmetric dimers that resemble classical carboxylic acids; however, the tilted-out-of-plane geometry of one methoxy groups described earlier precludes the presence of a pertaining center of inversion. Furthermore, one hydrogen atom on each methyl group gives rise to C–H…O contacts. However, only oxygen atoms on the molecule whose methoxy group deviates more from co-planarity within itself act as acceptors, i.e. the oxygen atom of the hydroxyl group as well as the methoxy group. In terms of graph-set analysis [10], [11], the descriptor for the classical hydrogen bonds is SSDD on the unary level and R22(12) on the binary level. The corresponding descriptor for the C–H…O contacts is DR22(14) at the unary level. In total, the contacts connect the molecules to undulated sheets along [1 0 1]. π-stacking is observed in the crystal structure of the title compound with the shortest distance in between two centers of gravity measured at only 3.5534(8) Å. This distance is observed between the aromatic systems of the molecule whose methoxy group deviates more from co-planarity with the other non-hydrogen atoms present in the same molecule.

Corresponding author: Richard Betz, Department of Chemistry, Nelson Mandela University, Summerstrand Campus (South), University Way, Summerstrand, PO Box 77000, Port Elizabeth, 6031, South Africa, E-mail:

Acknowledgments

The authors thank Mrs Bulelwa Gloria Botha for helpful discussions.

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-08-03
Accepted: 2020-09-22
Published Online: 2020-10-02
Published in Print: 2021-01-26

© 2020 Lubabalo Ndima et al., published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

Articles in the same Issue

  1. Frontmatter
  2. New Crystal Structures
  3. The crystal structure of 3-oxo-urs-12-en-28-oic acid, C30H46O3·1/6H2O
  4. The crystal structure of (3S,12R,20R,24R)-3,12-diacetyl-20,24-epoxy-dammarane-3,12,25–triol–ethyl acetate (4/1), C34H56O6⋅ 0.25(C4H8O2)
  5. A new polymorph of tetrakis(dimethylammonium) catena-poly[tetrakis(μ2-sulfato-κ2O:O′)dizinc(II)], Zn2C8H32N4O16S4
  6. Crystal structure of 10-oxysophoridine, C15H22N2O2
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  17. Crystal structure of DL-α-(methylaminomethyl)benzyl alcohol, C9H13NO
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  19. Crystal structure of N,N-diphenylformamide, C13H11NO
  20. Crystal structure of (E)-2-(3,5-bis(trifluoromethyl)benzylidene)-7-methoxy-3,4-dihydronaphthalen- 1(2H)-one, C20H14F6O2
  21. Crystal structure of ortho-methoxy benzaldehyde, C8H8O2 – a second polymorph and deposition of 3D coordinates
  22. Crystal structure of catena-poly[diaqua-bis(μ2-2-(4-(2,4,4-trimethylpentan-2-yl)phenoxy)propanoato-κ2O:O')-(2-(4-(2,4,4-trimethylpentan-2-yl)phenoxy)propanoato-κ2O,O')yttrium(III)], C51H79O11Y
  23. Crystal structure of benzylthiouronium chloride, C8H11ClN2S
  24. Synthesis and crystal structure of tert-butyl (2′R,3R,3′R,4a′R,9a′S)-1-acetyl-5-chloro-3″-methyl-2,5″,9′-trioxo-1″-phenyl-1″,4a′,5″,9a′-tetrahydro-1′H,3′H,9′H-dispiro[indoline-3,4′-xanthene-2′,4″-pyrazole]-3′-carboxylate, C36H32ClN3O7
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  72. The crystal structure of N-(2-methoxy-4,5-bis[phenylselanyl]phenyl)picolinamide, C25H20N2O2Se2
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  74. Crystal structure of fac-tricarbonyl-(nitrato-k1O)-bis(pyridine-κN)-rhenium, C13H10O6N3Re
  75. Crystal structure of (E)-2-(((1H-pyrrol-2-yl)methylene)amino)-3′,6′-dihydroxyspiro[isoindoline-1,9′-xanthen]-3-one — methanol (1/2), C27H25N3O6
  76. The crystal structure of 4-amino-N′-(4-aminobenzoyl)benzohydrazide monohydrate, C14H16N4O3
  77. Crystal structure of bis(amino(carbamothioylamino)methaniminium) 5-hydroxyisophthalate monohydrate, C12H20N8O6S2
  78. The crystal structure of 2-(chloromethyl)pyridine, C6H6ClN
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https://doi.org/10.1515/ncrs-2020-0426
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Articles in the same Issue

  1. Frontmatter
  2. New Crystal Structures
  3. The crystal structure of 3-oxo-urs-12-en-28-oic acid, C30H46O3·1/6H2O
  4. The crystal structure of (3S,12R,20R,24R)-3,12-diacetyl-20,24-epoxy-dammarane-3,12,25–triol–ethyl acetate (4/1), C34H56O6⋅ 0.25(C4H8O2)
  5. A new polymorph of tetrakis(dimethylammonium) catena-poly[tetrakis(μ2-sulfato-κ2O:O′)dizinc(II)], Zn2C8H32N4O16S4
  6. Crystal structure of 10-oxysophoridine, C15H22N2O2
  7. The crystal structure of (5R,8R,9R,10R,12R,13R,14R)-12-hydroxy-4,4,8,10,14-pentamethyl-17-((R)-2,6,6-trimethyltetrahydro-2H-pyran-2-yl)tetradecahydro-3H-cyclopenta[a]phenanthrene-3,6(2H)-dione, C30H48O4
  8. Synthesis, crystal structure and optical property of 1,6-bis(p-tolylthio)pyrene, C30H22S2
  9. The crystal structure of hexakis(2-(pyridin-2-ylamino)pyridin-1-ium) decavanadate(V) dihydrate, C60H64N18O30V10
  10. Preparation and crystal structure of a cationic olefin polymerization precatalyst: (1,7-bis(2,6–dichlorophenyl)-1,7-di-aza-4-oxo-heptan-1,4,7-triyl)dimethyl zirconium(IV), C18H20Cl4N2OZr
  11. The crystal structure of fac-tricarbonyl(4,4-dimethyl-2,2-dipyridyl-κ2N,N′)- (pyrazole-κN)rhenium(I) nitrate, C18H16O3N4Re
  12. Synthesis and crystal structure of hexaaquacopper(II) 2,5-dicarboxyterephthalate, C10H16O14Cu
  13. The crystal structure of (8R,10R,12R,14R)- 12-hydroxy-16-(5-(2-hydroxypropan-2-yl)-2-methyltetrahydrofuran-2-yl)- 4,4,8,10,14-pentamethyltetradecahydro-3H- cyclopenta[a]phenanthrene-3,6(2H)-dione, C30H48O5
  14. Structure of the mixed crystal (S)-(6-(bromo/chloro)-2-methoxy-2,6-dihydroquinolin-3-yl)(phenyl)methanol, C17H14Br0.5Cl0.5NO2
  15. The crystal structure of trans-tetraaqua-bis(4-acetylphenoxyacetato-κ1O)manganese(II), C20H26O12Mn
  16. Crystal structure of (E)-2-(4-fluoro-3-(trifluoromethyl)benzylidene)-7-methoxy-3,4-dihydronaphthalen-1(2H)-one, C19H14F4O2
  17. Crystal structure of DL-α-(methylaminomethyl)benzyl alcohol, C9H13NO
  18. The crystal structure of dipentaerthritol hexanitrate, C10H16N6O19
  19. Crystal structure of N,N-diphenylformamide, C13H11NO
  20. Crystal structure of (E)-2-(3,5-bis(trifluoromethyl)benzylidene)-7-methoxy-3,4-dihydronaphthalen- 1(2H)-one, C20H14F6O2
  21. Crystal structure of ortho-methoxy benzaldehyde, C8H8O2 – a second polymorph and deposition of 3D coordinates
  22. Crystal structure of catena-poly[diaqua-bis(μ2-2-(4-(2,4,4-trimethylpentan-2-yl)phenoxy)propanoato-κ2O:O')-(2-(4-(2,4,4-trimethylpentan-2-yl)phenoxy)propanoato-κ2O,O')yttrium(III)], C51H79O11Y
  23. Crystal structure of benzylthiouronium chloride, C8H11ClN2S
  24. Synthesis and crystal structure of tert-butyl (2′R,3R,3′R,4a′R,9a′S)-1-acetyl-5-chloro-3″-methyl-2,5″,9′-trioxo-1″-phenyl-1″,4a′,5″,9a′-tetrahydro-1′H,3′H,9′H-dispiro[indoline-3,4′-xanthene-2′,4″-pyrazole]-3′-carboxylate, C36H32ClN3O7
  25. Crystal structure of 2-hydroxy-4-methoxy benzaldehyde, C8H8O3
  26. Crystal structure of poly[diaqua-(m3-3′,5′-dicarboxy-[1,1′-biphenyl]-3,4-dicarboxylato-K4O,O′:O″:O‴) cadmium(II)], C16H11O10Cd
  27. Crystal structure of {tetraaqua-bis(1-(4-hydroxy-2-oxotetrahydrofuran-3-yl)-2-((4aS,6R,8aS)-6-hydroxy-5-(hydroxymethyl)-5,8a-dimethyl-2-methylenedecahydronaphthalen-1-yl)ethane-1-sulfonato-k2O,O') calcium(II)}-{triaqua-bis(1-(4-hydroxy-2-oxotetrahydrofuran-3-yl)-2-((4aS,6R,8aS)-6-hydroxy-5-(hydroxymethyl)-5,8a-dimethyl-2-methylenedecahydronaphthalen-1-yl)ethane-1-sulfonato-k2O,O') calcium(II)} – water – acetone (1/1/8/2)
  28. Synthesis and crystal structure of bis{2-bromo-6-((E)-((4-((E)-1-(methoxy-imino)ethyl)phenyl)imino)methyl)phenolato- κ2N,O}zinc(II)-methanol(1/2), C65H60Br4N8O9Zn2
  29. Crystal structure of benzenesulphonic acid
  30. Crystal structure of N-benzyl-N-nicotinoyl-nicotine amide C19H15N3O2
  31. Crystal structure of poly[aqua(μ3-2,4-diamino-benzenesulfonato-κ4N:N′,O:O′)silver(I)], C12H18O8N4S2Ag2
  32. Crystal structure of 1,4-bis(methylpyridinium benzene) bis(1,2-dicyanoethene-1,2-dithiolato-κ2S:S)nickel(II), C26H18N6NiS4
  33. Crystal structure of the Cu(II) complex chlorido-(6-oxo-2-phenyl-1,6-dihydropyrimidine-4-carboxylato-k2N,O)-(phenanthroline-k2N,N')copper(II), C23H15ClCuN4O3
  34. Crystal structure of phenarsazine chloride acetic acid solvate, C14H13AsClNO2
  35. Crystal structure of poly[aqua-(μ2-3,3′,4,5′-biphenyl tetracarboxylate- κ3O,O′:O′′) -(μ2-4,4′-bis(pyrid-4-yl)biphenyl-κ2N:N′)zinc(II)], C27H18NO9Zn
  36. Crystal structure of catena-poly[(μ2-3-amino-benzenedisulfonato-κ2N:O)-bis (3-methyl-isoquinoline-κN)silver(I)], C26H24N3O3SAg
  37. Crystal structure of 2-((4-Aminophenyl)thio)acetic acid, C8H9NO2S
  38. Crystal structure of phenarsazine chloride dimethylsulfoxide solvate, C14H15AsClNOS
  39. Synthesis and crystal structure of 2-azido-N-phenylacetamide, C8H8N4O
  40. Crystal structure of chlorido{hydridotris[3-phenyl-5-methylpyrazol-1-yl-κN3]borato}copper(II), C30H28BClCuN6
  41. Crystal structure of benzanthrone – a redetermination for correct molecular geometry and localization of hydrogen atoms
  42. Crystal structure of 4-bromobenzaldehyde – complete redetermination at 200 K, C7H5BrO
  43. Crystal structure and spectroscopic properties of chlorido{hydridotris[3-,5-dimethylpyrazol-1-yl-κN3]borato}(3-,5-dimethylpyrazol-1-yl-κN)copper(II), C20H30BClCuN8
  44. The crystal structure of 4-((2-hydroxynaphthalen-1-yl)(pyrrolidin-1-yl)methyl)benzonitrile, C22H20N2O
  45. Crystal structure of 4-ethyl-3-phenylisoquinolin-1(2H)-one, C17H15NO
  46. Crystal structure of (tricyclohexylphosphane-κP)-[(Z)-N-(3-fluorophenyl)-O-methylthiocarbamato-k1S]gold(I), C26H40AuFNOPS
  47. Crystal structure of (3S,8R,10R,12R,14R)-12-hydroxy-4,4,8,10,14-pentamethyl-17-((R)-2,6,6-trimethyltetrahydro-2H-pyran-2-yl) hexadecahydro-1H-cyclopenta[a]phenanthren-3-yl acetate, C32H54O4
  48. The crystal structure of 2-[(S)-1-(naphthalen-1-yl)ethyl]-2,3,7,7a- tetrahydro-3a,6-epoxyisoindol-1(6H)-one, C19H20NO2
  49. Crystal structure of {hydridotris[3-(t-butyl)-5-isopropylpyrazol-1-yl-κN3]borato}thallium(I), C30H52BN6Tl
  50. Synthesis and crystal structure of 1-octyl-3-phenylquinoxalin-2(1H)-one, C22H26N2O
  51. The crystal structure of 2,6-difluorophenol, C6H4F2O
  52. 4-(9H-Fluoren-9-yl)-4-methylmorpholin-4-ium bromide, C18H20BrNO
  53. The crystal structure of 2,4-dimethylimidazole monohydrate, C5H10N2O
  54. The crystal structure of 1,2-dimethylimidazole, C5H8N2
  55. The crystal structure of 3-ammonio-4-aminobenzoate, C7H8N2O2 – a second polymorph
  56. The crystal structure of 4-hydroxy-2,5-bis(1-methyl-1H-imidazol-3-ium-2-ylthio)-3,6-dioxocyclohexa-1,4-dienolate chloride monohydrate, C14H15N4O5S2Cl
  57. The crystal structure of butyrylferrocene, C14H16FeO
  58. The crystal structure of bi-1,1′-cyclopentane-1,1′-diol, C10H18O2
  59. The crystal structure of 2-iso-propylimidazole, C6H10N2
  60. The crystal structure of aqua-tris (1,3-diphenylpropane-1,3-dionato-κ2O,O′)-lanthanum(III), C45H35LaO7
  61. Crystal structure of (3E,5E)-3,5-bis-4-methoxy-3-(trifluoromethyl)benzylidene)-1-methylpiperidin-4-one, C24H21F6NO3
  62. The crystal structure of 3,5-dichloro-6-diazo-2,4-dinitrocyclohexa-2,4-dien-1-one, C6Cl2N4O5
  63. Crystal structure of carbonyl(2-methylquinolin-8-olato-κ2N,O)(triphenylarsine-κAs)rhodium(I), C29H23AsNO2Rh
  64. Crystal structure of (1aS,1a1S,2S)-4a-butoxy-1a,1a1,2,4a,5,6-hexahydro-1H-cyclobuta[de]naphthalen-2-yl-4-nitrobenzoate, C22H25NO5
  65. Crystal structure of carbonyl(2-oxopyridin-1(2H)-olato-k2O,O′)(triphenylarsine-κAs)rhodium(I), C24H19AsNO3Rh
  66. Crystal structure of catena-poly[triqua-bis(μ2-4-carboxy-2-(1H-tetrazol-1-yl)-1H-imidazole-5-carboxylato-k3N,O:O′)barium(II)] tetrahydrate, C14H14BaN12O15
  67. Crystal structure of (E)-3′,6′-bis(ethylamino)-2-((quinoxalin-2-ylmethylene)amino)spiro[isoindoline-1,9′-xanthen]-3-one, C35H32N6O2
  68. Crystal structure of diaqua-bis(μ2-5-chloro-salicylato-κ3O,O′:O′)-bis(5-chloro-salicylato-κ2O,O′)-bis(1,10-phenanthroline-κ2N,N′) dilead(II) – water (1/2), C52H36C14N4O14Pb2·2(H2O)
  69. Crystal structure of (E)-2-(4-ethoxycarbonyl-3,5-dimethyl-2-(pyrrole-2-ylmethyleneamino)-3′,6′-dihydroxylspiro[isoindoline-1,9′-xanthen]-3-one-methanol (1/1), C31H29N3O7
  70. The crystal structure of 5H-dibenzo[b,e]azepine-6,11-dione, C14H9NO2
  71. Crystal structure of (E)-2-(4-fluoro-2-(trifluoromethyl)benzylidene)-7-methoxy-3,4-dihydronaphthalen-1(2H)-one, C19H14F4O2
  72. The crystal structure of N-(2-methoxy-4,5-bis[phenylselanyl]phenyl)picolinamide, C25H20N2O2Se2
  73. The crystal structure of (E)-2-(5-bromo-2-hydroxybenzylidene)-N-phenylhydrazine-1- carboxamide monohydrate, C14H14BrN3O3
  74. Crystal structure of fac-tricarbonyl-(nitrato-k1O)-bis(pyridine-κN)-rhenium, C13H10O6N3Re
  75. Crystal structure of (E)-2-(((1H-pyrrol-2-yl)methylene)amino)-3′,6′-dihydroxyspiro[isoindoline-1,9′-xanthen]-3-one — methanol (1/2), C27H25N3O6
  76. The crystal structure of 4-amino-N′-(4-aminobenzoyl)benzohydrazide monohydrate, C14H16N4O3
  77. Crystal structure of bis(amino(carbamothioylamino)methaniminium) 5-hydroxyisophthalate monohydrate, C12H20N8O6S2
  78. The crystal structure of 2-(chloromethyl)pyridine, C6H6ClN
  79. The crystal structure of 1-bromo-4-iodo-benzene, C6H4BrI
  80. The crystal structure of 2,6-dimethyl-4-nitro-phenol, C8H9NO3
  81. The crystal structure of 3-chloropropionic acid, C3H5ClO2
  82. The crystal structure of 2-(2-methoxyphenyl)acetic acid, C9H10O3
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