Synthesis and crystal structure of trans-tetraaqua-bis(3-(((7-hydroxy-3-(4-hydroxy-3-sulfonatophenyl)-4-oxo-4H-chromen-8-yl)methyl)ammonio)propanoato-κO)zinc(II) tetrahydrate, C38H48N2O26S2Zn
Abstract
C38H48N2O26S2Zn, monoclinic, P21/c (no. 14), a = 15.7219(7) Å, b = 8.0394(4) Å, c = 17.1968(8) Å, β = 92.210(4)°, V = 2171.97(18) Å3, Z = 2, Rgt(F) = 0.0395, wRref(F2) = 0.0951, T = 293(2) K.
The crystal structure is shown in the figure. Tables 1 and 2 contain details on crystal structure and measurement conditions and a list of the atoms including atomic coordinates and displacement parameters.
Data collection and handling.
Crystal: | Colorless prism |
Size: | 0.40 × 0.10 × 0.10 mm |
Wavelength: | Mo Kα radiation (0.71073 Å) |
μ: | 0.76 mm−1 |
Diffractometer, scan mode: | Bruker SMART, φ and ω-scans |
θmax, completeness: | 25°, >99% |
N(hkl)measured, N(hkl)unique, Rint: | 8830, 3813, 0.031 |
Criterion for Iobs, N(hkl)gt: | Iobs > 2 σ(Iobs), 2937 |
N(param)refined: | 313 |
Programs: | Bruker programs [1], SHELX [2], [3] |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2).
Atom | x | y | z | Uiso*/Ueq |
---|---|---|---|---|
Zn1 | 1.000000 | 0.000000 | 0.500000 | 0.02915(15) |
S1 | 0.22333(5) | 0.53926(9) | 0.20695(4) | 0.02665(19) |
N1 | 0.89627(14) | 0.4397(3) | 0.39539(14) | 0.0290(6) |
H1A | 0.872895 | 0.356788 | 0.360936 | 0.044* |
H1B | 0.909195 | 0.366288 | 0.437436 | 0.044* |
O1 | 0.81607(13) | 0.4478(3) | 0.56448(12) | 0.0393(6) |
H1 | 0.812103 | 0.428794 | 0.612815 | 0.059* |
O2 | 0.46416(14) | 0.3251(3) | 0.38305(14) | 0.0530(7) |
O3 | 0.68781(13) | 0.5283(3) | 0.31862(12) | 0.0355(5) |
O4 | 0.27956(13) | 0.4169(3) | 0.05569(12) | 0.0426(6) |
H13 | 0.300359 | 0.391576 | 0.012364 | 0.064* |
O5 | 0.17162(13) | 0.3915(3) | 0.20238(13) | 0.0405(6) |
O6 | 0.22958(13) | 0.6102(3) | 0.28481(12) | 0.0374(5) |
O7 | 0.19513(14) | 0.6621(3) | 0.14980(12) | 0.0411(6) |
O8 | 1.02329(13) | 0.2369(2) | 0.45895(12) | 0.0337(5) |
O9 | 1.13537(13) | 0.1783(3) | 0.38890(13) | 0.0396(6) |
O10 | 0.98447(14) | −0.0842(3) | 0.38270(12) | 0.0410(6) |
H10A | 0.940233 | −0.069369 | 0.353534 | 0.062* |
H10B | 1.023722 | −0.073889 | 0.350414 | 0.062* |
O11 | 0.87349(13) | 0.0691(3) | 0.50467(13) | 0.0381(5) |
H11A | 0.850268 | −0.005392 | 0.531796 | 0.057* |
H11B | 0.843768 | 0.066668 | 0.462326 | 0.057* |
O12 | 0.31241(14) | 0.3285(3) | 0.91059(13) | 0.0506(6) |
H12A | 0.354258 | 0.265109 | 0.901917 | 0.076* |
H12B | 0.271478 | 0.269969 | 0.891927 | 0.076* |
O13 | 0.12753(16) | 0.9099(3) | 0.28461(14) | 0.0560(7) |
H13A | 0.148019 | 0.992954 | 0.309553 | 0.084* |
H13B | 0.163609 | 0.837765 | 0.300643 | 0.084* |
C1 | 0.74705(19) | 0.4302(4) | 0.51697(17) | 0.0294(7) |
C2 | 0.6729(2) | 0.3550(4) | 0.54189(19) | 0.0415(8) |
H2 | 0.670727 | 0.313741 | 0.592289 | 0.050* |
C3 | 0.6040(2) | 0.3424(4) | 0.49243(19) | 0.0429(9) |
H3 | 0.554518 | 0.293994 | 0.509898 | 0.052* |
C4 | 0.60531(19) | 0.3999(4) | 0.41630(17) | 0.0306(7) |
C5 | 0.68042(18) | 0.4706(3) | 0.39292(17) | 0.0263(7) |
C6 | 0.75214(18) | 0.4889(3) | 0.44191(17) | 0.0261(6) |
C7 | 0.53140(19) | 0.3868(4) | 0.36301(18) | 0.0331(7) |
C8 | 0.54401(19) | 0.4511(4) | 0.28476(18) | 0.0315(7) |
C9 | 0.61941(19) | 0.5171(4) | 0.26920(19) | 0.0359(8) |
H9 | 0.625303 | 0.559500 | 0.219378 | 0.043* |
C10 | 0.47498(19) | 0.4443(4) | 0.22402(18) | 0.0324(7) |
C11 | 0.39245(18) | 0.4888(4) | 0.24024(18) | 0.0297(7) |
H11 | 0.380490 | 0.524063 | 0.290154 | 0.036* |
C12 | 0.32762(18) | 0.4822(3) | 0.18397(17) | 0.0260(7) |
C13 | 0.34441(18) | 0.4289(4) | 0.10891(17) | 0.0312(7) |
C14 | 0.4271(2) | 0.3883(5) | 0.09246(19) | 0.0449(9) |
H14 | 0.439548 | 0.355447 | 0.042316 | 0.054* |
C15 | 0.4910(2) | 0.3955(4) | 0.14875(19) | 0.0436(9) |
H15 | 0.546173 | 0.367178 | 0.136203 | 0.052* |
C16 | 0.83206(18) | 0.5683(3) | 0.41536(17) | 0.0272(7) |
H16A | 0.818968 | 0.636909 | 0.370060 | 0.033* |
H16B | 0.855644 | 0.639647 | 0.456264 | 0.033* |
C17 | 0.97687(18) | 0.5093(4) | 0.36714(19) | 0.0314(7) |
H17A | 1.005671 | 0.570749 | 0.408956 | 0.038* |
H17B | 0.963986 | 0.586377 | 0.324918 | 0.038* |
C18 | 1.03512(19) | 0.3753(4) | 0.33912(17) | 0.0337(7) |
H18A | 1.004805 | 0.312375 | 0.298699 | 0.040* |
H18B | 1.083284 | 0.428152 | 0.315597 | 0.040* |
C19 | 1.06836(19) | 0.2559(4) | 0.40006(18) | 0.0314(7) |
Source of material
The educt sodium 5-(8-(((2-carboxyethyl)amino)methyl)-7-hydroxy-4-oxo-4H-chromen-3-yl)-2-hydroxybenzenesulfonate was synthesized via a Mannich reaction. In a typical experiment a formaldehyde solution (10 mL, 37%) and sodium 2-hydroxy-5-(7-hydroxy-4-oxo-4H-chromen-3-yl)benzenesulfonate (3.56 g, 0.01 mol) were added to ethanol (200 mL, 99%) and stirred for 0.5 h at 328 K. Then, the saturated solution of 3-aminopropionic acid (1.336 g, 0.015 mol) was added to the reaction mixture. Then, hot water was added until a transparent solution was obtained. After 24 h reaction time, the mixture was filtered, and the residue was collected. Then the residue was dried at 383 K. Sodium 5-(8-(((2-carboxyethyl)amino)methyl)-7-hydroxy-4-oxo-4H-chromen-3-yl)-2-hydroxybenzenesulfonate (0.874 g) was obtained. NMR spectra were recorded on a Bruker AVANCE III HD instrument. 1H-NMR (400 MHz, DMSO-d6) δ: 10.61 (s, 1H, H13), 8.37 (s, 1H, H9), 8.07 (d, J = 8.9 Hz, 1H, H3), 7.69 (d, J = 2.3 Hz, 1H, H11), 7.40 (dd, J = 8.5, 2.3 Hz, 1H, H15), 7.10 (d, J = 8.9 Hz, 1H, H2), 6.86 (d, J = 8.5 Hz, 1H, H14), 4.33 (s, 2H, H16A, H16B), 3.21 (t, J = 6.9 Hz, 2H, H17A, H17B), 2.68 (t, J = 6.9 Hz, 2H, H18A, H18B). 13C-NMR (100 MHz, DMSO-d6) δ: 174.54 (C7), 172.02 (C19), 161.58 (C1), 155.85 (C5), 153.36 (C13), 152.77 (C9), 131.47 (C15), 130.71 (C12), 128.14 (C3), 127.68 (C11), 123.28 (C10), 121.96 (C8), 116.48 (C4), 116.35 (C14), 114.42 (C2), 105.57 (C6), 42.90 (C17), 39.10 (C16), 30.36 (C18). IR (potassium bromide pellet) were recorded on a Nicolet 6700. IR (v/cm−1): 3565, 3428, 3090, 1707, 1632, 1605, 1510, 1452, 1400, 1383, 1329, 1300, 1274, 1213, 1172, 1107, 1071, 1093, 1040, 1025, 832, 811, 793, 741, 728, 645, 620, 534. ESI-MS: m/z 434.17[M–Na]−. Zincacetate dihydrate (0.0550 g, 0.25 mmol) and the aforementioned sodium salt (0.0229 g, 0.05 mmol) were added to water (10 mL) and sonicated for 10 min. The mixture was heated for 9 h at 358 K. After filtration, a transparent solution was obtained. After 2 days, colorless needle crystals of the title compound were obtained.
Experimental details
Carbon-bound H atoms were placed in calculated positions and were included in the refinement in the riding model approximation, with Uiso(H) set to 1.2 Ueq(C). The oxygen- and nitrogen-bound H atoms were located on a difference Fourier map.
Discussion
In the past decades, the synthesis of Mannich bases that contained amino acids has been widely studied [4], [5], [6], [7], [8]. We have already synthesized two amino-acid derivatives of sodium 2-hydroxy-5-(7-hydroxy-4-oxo-4H-chromen-3-yl)benzenesulfonate by the Mannich reaction and studied their coordination behavior with metal ions [9], [10], [11]. As a continuation, we synthesized a 3-aminopropanoic acid derivative, sodium 5-(8-(((2-carboxyethyl)amino)methyl)-7-hydroxy-4-oxo-4H-chromen-3-yl)-2-hydroxybenzenesulfonate. We used this compound to react with a zinc(II) acetate solution and got the title complex.
X-ray crystallographic analysis of a single crystal of the title Zn(II) complex reveals a mononuclear structure. There is one half of a Zn(II) ion, one organic ligand, two coordinated water molecules and two uncoordinated water molecules in the asymmetric unit of the title structure (cf. the figure, the asymmetric unit is labeled). Zn1, located at an inversion center, is six-coordinated with a distorted octahedral geometry by four coordinated water and two O atoms from two monodentate coordinating ligands. The Zn—O bond distances are in the range of 2.0686(19) Å and 2.133(2) Å. The carboxylate groups adopt trans conformations, with the C19—C18—C17—N1 torsion angles to be −65.0°. The nitrogen atom N1 is protonated. Adjacent ligands have intramolecular N1—H1B⋯O8 hydrogen bond of length 2.094 Å. There exist some more O—H⋯O and N—H⋯O hydrogen bonds forming a three-dimensional framework. It is obvious that the hydrogen bonds play important roles in the self-assembly and enhance stability of the resultant structure.
Acknowledgements
This work was financially supported by the Foundation of Guangxi Colleges Universities Key Laboratary of Exploitation and Utilization of Microbial and Botanical Resources (No. 2018HL005), the Education Department of Guangxi Zhuang Autonomous Region of China (No. KY2016LX290), the Foundation of Hechi University (No. XJ2016QN023).
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©2019 Hai-Lin Chen et al., published by De Gruyter, Berlin/Boston
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- Crystal structure of 5-(4-fluorophenyl)-4-methyl-2,4-dihydro-3H-1,2,4-triazole-3-thione, C9H8FN3S
- Crystal structure of catena-poly[(1-(4-fluorophenyl)-N–(5-((trimethylstannyl)thio)-1,3,4-thiadiazol-2-yl)methanimine], (C12H14FN3S2Sn)n
- The crystal structure of 4-(methoxycarbonyl)benzoic acid, C9H8O4
- The crystal structure of N,N′-(6-(thiophen-2-yl)-1,3,5-triazine-2,4-diyl)bis(2-methylpropane-2-sulfonamide) – ethyl acetate(2/1), C34H54N10O6S6
- Crystal structure of N′-(1-(2-hydroxyphenyl)ethylidene)-5-methyl-1-phenyl-1H-1,2,3-triazole-4-carbohydrazide, C18H17N5O2
- Crystal structure of 3-(4-methoxyphenyl)-1-phenylprop-2-yn-1-one, C16H12O2
- Crystal structure of N′-(1-(benzofuran-2-yl)ethylidene)-2-cyanoacetohydrazide, C13H11N3O2
- Crystal structure of hexa-μ2-chlorido-μ4-oxido-tetrakis(1-vinyl-1H-imidazole-κN)tetracopper(II), C20H24Cu4Cl6N8O
- Crystal structure of N′-((1E,2E)-4-(7-methoxy-2-oxo-2H-chromen-8-yl)-2-methylbut-2-en-1-ylidene)-4-methylbenzenesulfonohydrazide, C22H22O5N2S
- Crystal structure of 2-acetyl pyrene, C18H12O
Articles in the same Issue
- Cover and Frontmatter
- Crystal structure of 1H-indole-5-carboxylic acid – 4,4′-bipyridine (2/1), C14H11N2O2
- Crystal structure of ethyl 2-amino-4-(4-ethoxyphenyl)-5-oxo-4H,5H-pyrano[3,2-c] chromene-3-carboxylate, C23H21NO6
- Crystal structure of ethyl 2-amino-4-(4-bromothiophen-2-yl)-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carboxylate, C16H16BrNO4S
- The crystal structure of 6-amino-2-methyl-8-(4-(methylthio)phenyl)-2,3,8,8a-tetrahydroisoquinoline-5,7,7(1H)-tricarbonitrile – ethanol (1/1), C20H19N5S
- Crystal structure of 6-amino-8-(4-isopropylphenyl)-2-methyl-2,3,8,8a-tetrahydroisoquinoline-5,7,7(1H)-tricarbonitrile-ethanol (1/1), C24H29N5O
- Crystal structure of 1,1′-(ethane-1,2-diyl)bis(3-ethyl-1H-imidazol-3-ium)bis(hexafluorido phosphate), C12H20F12N4P2
- Crystal structure of dimethyl (3aS,6R,6aS,7S)-2-pivaloyl-2,3-dihydro-1H,6H,7H-3a,6:7,9a-diepoxybenzo[de]isoquinoline-3a1,6a-dicarboxylate, C21H25NO8
- Crystal structure of methyl 4-(4-bromothiophen-2-yl)-2,7,7-trimethyl-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, C18H20BrNO3S
- Hydrothermal synthesis and crystal structure of catena-poly[bis(4-((pyridin-4-ylmethyl)amino)benzoato-κ3N:O,O′)zinc(II) – 1,2-di(pyridin-4-yl)ethene – water (1/1/1), C38H34N6O5Zn
- The crystal structure of 1,2-dimethyl-3,4-dinitrobenzene, C8H8N2O4
- Synthesis and crystal structure of trans-tetraaqua-bis(3-(((7-hydroxy-3-(4-hydroxy-3-sulfonatophenyl)-4-oxo-4H-chromen-8-yl)methyl)ammonio)propanoato-κO)zinc(II) tetrahydrate, C38H48N2O26S2Zn
- Crystal structure of diaqua-bis(μ2-6-chloropyridin-2-olato-κ3N,O:O)-tetrakis(chloropyridin-2-olato-κ1O)-bis(penanthroline-κ2N,N′)diterbium(III), C54H38Cl6Tb2N10O8
- Crystal structure of oxidobis(piperidine-1-carbodithioato-κ2S,S′)vanadium(IV), C12H20N2OS4V
- Crystal structure of 2-((tert-butyldimethylsilyl)oxy)-5-methylisophthalaldehyde, C15H22O3Si
- Crystal structure of catena-poly[tetraiodido-(μ2-1,4-bis(2-methyl-1H-imidazol-1-yl)benzene-κ2N:N′)dimercury(II)], C14H14Hg2I4N4
- Crystal structure of tetrakis(n-butyl)-(μ2-1,2-bis(2-oxidobenzoyl)hydrazine-1,2-diido-κ6N,O,O′:N′,O′′,O′′′)ditin(IV), C30H44N2O4Sn2
- Crystal structure of ethyl 2-amino-4-(4-hydroxy-3-methoxyphenyl)-7-methyl-5-oxo-4H,5H-pyrano-[4,3-b]pyran-3-carboxylate, C19H19NO7
- Crystal structure of 3-aminopyrazine-2-carbohydrazide, C5H7N5O
- Crystal structure of ethanol-bis(N-((5-(ethoxycarbonyl)-3,4-dimethyl-1H-pyrrol-2-yl)methylene)benzohydrazonato-κ2N,O)copper(II), C36H42N6O7Cu
- Crystal structure of 3-methyl-2-oxo-2H-chromen-7-yl propionate, C13H12O4
- Crystal structure of 2-(dimethylamino)ethyl 4-aminobenzoate, C11H16N2O2
- Crystal structure of 3-(benzo[d]thiazol-2-ylamino)isobenzofuran-1(3H)-one, C15H10N2O2S
- Crystal structure of 3-((1H-benzo[d]imidazol-2-yl)amino)-2-(1H-benzo[d]imidazol-2-yl)isoindolin-1-one, C22H16N6O
- Crystal structure of (2,2′-bipyridine-κ2N,N′)bis(4-(dimethylamino)phenyldiphenylphosphane-κP)copper(I) tetrafluoroborate, C50H48BCuF4N4P2
- Crystal structure of citric acid–acetonitrile (1/1), C8H11NO7
- Crystal structure of diethyl 2-(4-methoxyphenyl)-1-phenyl-1,2-dihydropyridine-3,5-dicarboxylate, C24H25NO5
- The crystal structure of poly[triaqua-bis(μ3-2,5-dihydroxyterephthalato-κ4O,O′:O′′:O′′′)-(μ4-oxalato-κ4O,O′:O′′,O′′′)cerium(III)], C9H10CeO11
- Crystal structure of 1-(5-(anthracen-9-yl)-3-(4-hydroxyphenyl)-4,5-dihydro-1H-pyrazol-1-yl)propan-1-one, C26H22N2O2
- Synthesis and crystal structure of 5-(8-(((2-carboxyethyl)ammonio)methyl)-7-hydroxy-4-oxo-4H-chromen-3-yl)-2-hydroxybenzenesulfonate trihydrate, C19H23NO12S
- Crystal structure of rac-trans-6,6′-((cyclohexane-1,2-diylbis(azanylylidene))bis(methanylylidene))bis(2-bromophenolato-κ4N,N′,O,O′)-bis(methanol)cobalt(III) chloride, C22H25Br2Co8N2O4Cl
- Crystal structure of 1-((R)-(2′-(dimethylamino)-[1,1′-binaphthalen]-2-yl))-3-((S)-2-hydroxy-1-phenylethyl)thiourea, C31H29N3OS
- Crystal structure and photochemical property of 1,8-bis(p-tolylthio)pyrene, C30H22S2
- Crystal structure of 2-(2-(2-amino-6-chloro-9H-purin-9-yl)ethyl)propane-1,3-diyl diacetate, C14H18ClN5O4
- Crystal structure of ethyl 5-amino-1-(pyridin-2-yl)-1H-pyrazole-4-carboxylate, C11H12N4O2
- Crystal structure of trichloro-(4-chloro-2,6-bis(diphenylmethyl)-N-((pyridin-2-yl)methylene)aniline)-aluminum dichloromethane solvate, C39H31AlCl6N2
- Bis(ethanol-κO)-bis(6-aminopicolinato-κ2N,O)magnesium(II), C16H22O6N4Mg
- Crystal structure of catena-poly[aqua-(μ2-1,7-dicarba-closo-dodecaborane-1,7-dicarboxylato-κ2O:O′)-(1,10-phenanthrolin-κ2N,N′)copper(II)], C16H20B10CuN2O5
- Crystal structure of (1,2-dicarba-closo-dodecaborane-1,2-dithiolato κ2S,S′)-bis(1,10-phenanthroline κ2N,N′)zinc(II), C26H26B10Zn4S2
- Crystal structure of diaqua-bis(1,10-phenanthroline-κ2N,N′)-bis(1,7-dicarba-closo-dodecaborane-1,7-dicarboxylato-κ3O,O′:O′′) dicobalt(II) — ethanol (1/1), C34H46B20Co2N4O11
- Crystal structure of ((5,5′-dimethoxy-2,2′-(1,2-phenylenebis(nitrilomethylidyne)))diphenolato-κ4O,N,O′,N′)copper(II), C22H18N2CuO4
- Crystal structure of 1-(5-bromo-2-(4-methoxyphenyl)-1H-indol-7-yl)ethan-1-ol, C17H14BrNO2
- Crystal structure of (E)-2-(((6-bromopyridin-2-yl)methylene)amino)-3′,6′-bis(diethylamino)spiro[isoindoline-1,9′-xanthen]-3-one, C34H34N5O2Br
- Crystal structure of (Z)-2-((adamantan-1-ylimino)methyl)-5-methoxyphenol, C18H23NO2
- Crystal structure of bis((E)-2-ethoxy-6-(((2-hydroxyethyl)imino)methyl)phenolato-κ2N,O)copper(II), C22H28N2CuO6
- Crystal structure of 2,3-diphenyl-5,6-bis(4-methoxyphenyl)pyrazine, C30H24N2O2
- Crystal structure of dichlorido bis[1-((2,4-dimethyl-1H-imidazol-1-yl)methyl)-1H-benzo[d][1,2,3]triazole-κN]cadmium(II), Cd(C12H13N5)2Cl2
- The crystal structure of 1,5-di(naphthalen-2-yl)-3-(pyridin-2-yl)pentane-1,5-dione, C30H23NO2
- The crystal structure of 2-((3-methylthiophen-2-yl)methylene)malononitrile, C9H6N2S
- The crystal structure of 1,4-dinitroso-2,3,5,6-tetraacetoxy-piperazine, C12H16N4O10
- Crystal structure of bis(2,4,6-trichlorophenyl) malonate, C15H6Cl6O4
- The crystal structure of trans-dichlorido-bis(pyridine-2-carboxylato-κ2N,O)platinum(IV), C12H8Cl2N2O4Pt
- Crystal structure of 3-nitroquinoline 1-oxide, C9H6N2O3
- Crystal structure of 2-(piperidin-1-ium-4-yl)-1H-benzo[d]imidazol-3-ium dichloride dihydrate, C12H21Cl2N3O2
- Crystal structure of (4S,4aS,6aR,6bR,12aS,12bR,14aS,14bR)-3,3,6a,6b,9,9,12a-heptamethyloctadecahydro-1H,3H-4,14b-ethanophenanthro[1,2-h]isochromene, C30H50O
- Crystal structure of (E)-4-((2-fluoro-3-(trifluoromethyl)benzylidene)amino)-3-methyl-1H-1,2,4-triazole-5(4H)-thione, C11H8F4N4S
- Crystal structure of 5-(4-fluorophenyl)-4-methyl-2,4-dihydro-3H-1,2,4-triazole-3-thione, C9H8FN3S
- Crystal structure of catena-poly[(1-(4-fluorophenyl)-N–(5-((trimethylstannyl)thio)-1,3,4-thiadiazol-2-yl)methanimine], (C12H14FN3S2Sn)n
- The crystal structure of 4-(methoxycarbonyl)benzoic acid, C9H8O4
- The crystal structure of N,N′-(6-(thiophen-2-yl)-1,3,5-triazine-2,4-diyl)bis(2-methylpropane-2-sulfonamide) – ethyl acetate(2/1), C34H54N10O6S6
- Crystal structure of N′-(1-(2-hydroxyphenyl)ethylidene)-5-methyl-1-phenyl-1H-1,2,3-triazole-4-carbohydrazide, C18H17N5O2
- Crystal structure of 3-(4-methoxyphenyl)-1-phenylprop-2-yn-1-one, C16H12O2
- Crystal structure of N′-(1-(benzofuran-2-yl)ethylidene)-2-cyanoacetohydrazide, C13H11N3O2
- Crystal structure of hexa-μ2-chlorido-μ4-oxido-tetrakis(1-vinyl-1H-imidazole-κN)tetracopper(II), C20H24Cu4Cl6N8O
- Crystal structure of N′-((1E,2E)-4-(7-methoxy-2-oxo-2H-chromen-8-yl)-2-methylbut-2-en-1-ylidene)-4-methylbenzenesulfonohydrazide, C22H22O5N2S
- Crystal structure of 2-acetyl pyrene, C18H12O