Home Crystal structure of dichlorido-bis((E)-2-((pyridin-4-ylmethylene)amino)phenol)zinc(II), C24H20Cl2N4O2Zn
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Crystal structure of dichlorido-bis((E)-2-((pyridin-4-ylmethylene)amino)phenol)zinc(II), C24H20Cl2N4O2Zn

  • Adesola A. Adeleke , Sizwe J. Zamisa ORCID logo EMAIL logo and Bernard Omondi ORCID logo
Published/Copyright: February 12, 2020

Abstract

C24H20Cl2N4O2Zn, triclinic, P1̄ (no. 2), a = 9.9265(6) Å, b = 15.368(1) Å, c = 16.636(1) Å, α = 102.760(1)°, β = 90.385(2)°, γ = 94.112(3)°, V = 2311.4(3) Å3, Z = 4, Rgt(F) = 0.0260, wRref(F2) = 0.0653, T = 100(2) K.

CCDC no.: 1977194

One of two crystallographically independent complexes present in the asymmetric unit of the title 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:Yellow block
Size:0.32 × 0.24 × 0.13 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:1.32 mm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
θmax, completeness:28.5°, >99%
N(hkl)measured, N(hkl)unique, Rint:42934, 11554, 0.022
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 9948
N(param)refined:599
Programs:Bruker [1], SHELX [2], [4], Mercury [3]
Table 2:

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

AtomxyzUiso*/Ueq
Zn1A0.53123(2)0.50168(2)0.74864(2)0.01497(4)
Cl1A0.45239(4)0.39154(2)0.64279(2)0.02351(8)
Cl2A0.73240(4)0.48070(2)0.81512(2)0.01996(8)
O1A0.49354(14)0.81901(8)0.35948(7)0.0302(3)
H1A0.4993610.7798260.3872270.045*
O2A−0.32494(12)0.67340(8)0.94117(7)0.0234(2)
H2AA−0.2566510.6481630.9151620.035*
N1A0.61731(14)0.82862(8)0.51152(8)0.0188(3)
N2A0.56483(13)0.61225(8)0.69916(7)0.0164(2)
N3A−0.07106(13)0.63077(8)0.99315(8)0.0171(2)
N4A0.37381(13)0.53458(8)0.83253(7)0.0160(2)
C1A0.57005(17)0.89563(11)0.39851(9)0.0223(3)
C2A0.58197(18)0.96709(12)0.35904(10)0.0261(4)
H2A0.5359490.9617430.3068350.031*
C3A0.66073(18)1.04549(12)0.39602(10)0.0268(4)
H3A0.6690721.0937600.3687740.032*
C4A0.72802(18)1.05465(11)0.47268(11)0.0267(3)
H4A0.7832101.1085110.4972890.032*
C5A0.71398(17)0.98465(11)0.51289(10)0.0228(3)
H5A0.7589390.9910340.5655320.027*
C6A0.63426(16)0.90468(10)0.47677(9)0.0190(3)
C7A0.62881(16)0.83752(10)0.58946(9)0.0178(3)
H7A0.6480310.8954430.6238540.021*
C8A0.61255(15)0.75883(10)0.62664(9)0.0169(3)
C9A0.61682(18)0.76942(10)0.71207(9)0.0224(3)
H9A0.6369190.8270430.7468710.027*
C10A0.59151(18)0.69517(10)0.74567(9)0.0223(3)
H10A0.5930780.7032190.8039620.027*
C11A0.56507(17)0.60208(10)0.61674(9)0.0210(3)
H11A0.5486070.5434630.5832670.025*
C12A0.58806(17)0.67262(10)0.57861(9)0.0208(3)
H12A0.5872000.6624950.5201670.025*
C13A−0.30638(16)0.67668(10)1.02341(9)0.0178(3)
C14A−0.42056(17)0.69890(10)1.07575(10)0.0207(3)
H14A−0.5103470.7106761.0543440.025*
C15A−0.40219(17)0.70370(10)1.15948(10)0.0231(3)
H15A−0.4799610.7186051.1954640.028*
C16A−0.27063(17)0.68684(11)1.19116(10)0.0228(3)
H16A−0.2583390.6915381.2487390.027*
C17A−0.15757(17)0.66321(10)1.13890(9)0.0210(3)
H17A−0.0682630.6512721.1607710.025*
C18A−0.17425(15)0.65683(9)1.05397(9)0.0166(3)
C19A0.04993(16)0.60463(10)1.01075(9)0.0184(3)
H19A0.0707860.6016731.0660250.022*
C20A0.15804(16)0.57893(10)0.94734(9)0.0168(3)
C21A0.29266(16)0.55769(10)0.97106(9)0.0182(3)
H21A0.3128130.5579661.0271820.022*
C22A0.39695(16)0.53617(10)0.91255(9)0.0177(3)
H22A0.4884130.5219880.9296800.021*
C23A0.24256(17)0.55403(11)0.80920(9)0.0207(3)
H23A0.2250280.5525930.7525760.025*
C24A0.13278(16)0.57588(10)0.86374(9)0.0203(3)
H24A0.0416380.5886210.8448360.024*
Zn1B−0.09512(2)0.02925(2)0.74854(2)0.01920(5)
Cl1B−0.03373(4)−0.09137(2)0.65881(2)0.02339(8)
Cl2B−0.30760(4)0.02279(3)0.80974(2)0.02481(8)
O1B−0.09580(14)0.59846(8)0.69823(8)0.0308(3)
H1B−0.1141880.5462580.7049520.046*
O2B0.78118(13)0.20379(9)0.95782(7)0.0302(3)
H2BA0.7139210.1738240.9277770.045*
N1B0.02106(14)0.44309(9)0.63420(8)0.0211(3)
N2B−0.07254(14)0.13371(8)0.69008(8)0.0201(3)
N3B0.53289(14)0.12836(9)1.00096(8)0.0210(3)
N4B0.06352(14)0.06222(9)0.83847(8)0.0212(3)
C1B0.00852(18)0.59813(11)0.64173(10)0.0239(3)
C2B0.0507(2)0.67848(11)0.61925(11)0.0313(4)
H2B0.0054240.7314800.6425920.038*
C3B0.1583(2)0.68019(12)0.56301(11)0.0329(4)
H3B0.1878470.7349910.5483730.039*
C4B0.2243(2)0.60317(12)0.52733(12)0.0318(4)
H4B0.2977350.6051830.4882050.038*
C5B0.18237(18)0.52359(12)0.54919(11)0.0273(4)
H5B0.2277710.4708900.5251000.033*
C6B0.07372(16)0.51977(10)0.60645(10)0.0204(3)
C7B0.05899(17)0.36583(10)0.60088(10)0.0216(3)
H7B0.1230600.3594940.5560570.026*
C8B0.00609(16)0.28590(10)0.63003(9)0.0202(3)
C9B−0.10257(17)0.28683(11)0.68759(10)0.0230(3)
H9B−0.1511930.3394580.7071760.028*
C10B−0.13855(17)0.20986(11)0.71577(10)0.0234(3)
H10B−0.2128500.2108580.7548160.028*
C11B0.02741(18)0.13200(11)0.63172(10)0.0243(3)
H11B0.0717680.0779000.6113940.029*
C12B0.06801(18)0.20572(11)0.60023(10)0.0251(3)
H12B0.1378990.2016890.5584250.030*
C13B0.77353(18)0.18657(10)1.03498(10)0.0222(3)
C14B0.89429(19)0.20876(11)1.08737(10)0.0257(3)
H14B0.9802580.2351981.0694680.031*
C15B0.8883(2)0.19205(12)1.16568(11)0.0287(4)
H15B0.9699140.2079131.2019920.034*
C16B0.7633(2)0.15214(14)1.19143(11)0.0339(4)
H16B0.7604880.1398861.2449470.041*
C17B0.64268(19)0.13010(13)1.13964(11)0.0300(4)
H17B0.5576010.1028691.1577110.036*
C18B0.64601(17)0.14791(10)1.06071(10)0.0211(3)
C19B0.40400(18)0.10979(11)1.01926(10)0.0238(3)
H19B0.3821200.1070491.0743850.029*
C20B0.28787(17)0.09244(10)0.95603(10)0.0216(3)
C21B0.14505(19)0.08259(13)0.97796(11)0.0319(4)
H21B0.1216670.0858291.0339940.038*
C22B0.03650(19)0.06801(13)0.91805(11)0.0307(4)
H22B−0.0608500.0618940.9342300.037*
C23B0.20125(18)0.07332(12)0.81689(10)0.0279(4)
H23B0.2212180.0707960.7605260.033*
C24B0.31511(18)0.08825(12)0.87301(10)0.0263(3)
H24B0.4112410.0956140.8552500.032*

Source of material

The synthesis of the ligand (E)-2-((pyridin-4-ylmethylene)amino)phenol (pap) has been reported by us earlier [5], [6], [7]. This educt (2 mmol, 0.397 g) was dissolved in anhydrous ethanol (ca. 10 mL) and was added slowly to the solution of ZnCl2 (1 mmol, 0.136 g) in anhydrous ethanol (ca. 10 mL) and kept under stirring at ambient temperature for 6 h. A yellow precipitate was formed which was isolated in vacuo. The yellow precipitate was crystallized using DCM/toluene [8]. Yield = 0.456 g, 85.55%, m.p. = 226–227 °C, 1H NMR (400 MHz, DMSO-d6, 25 °C, δ in ppm): δ = 9.19 (2H, s, Hj-OH), 8.78 (2H, s, Hc—C=N—), 8.74 (4H, d, J = 5.91 Hz, Hb—C5H4N—), 8.00 (4H, d, J = 5.44 Hz, Ha—C5H4N), 7.28 (2H, d, J = 7.26 Hz, Hd—C6H4), 7.14 (2H, t, J = 8.11, 7.26 Hz, Hf—C6H4), 6.92 (2H, d, J = 8.11 Hz, Hg—C6H4), 6.86 (2H, t, J = 7.69 Hz, He—C6H4). 13C-NMR (400 MHz, DMSO-d6, 25 °C, δ in ppm): δ = 157.39 (—C=N—), 151.55 (—OH), 150.23 (C5H4N, 2C’s), 149.95 (C5H4N), 136.85 (C6H4), 128.49 (C6H4), 122.36 (C5H4N, 2C’s), 122.12 (C6H4), 119.47 (C6H4), 116.35 (C6H4). FT-IR (cm−1): (Ar-CH) 3055, (—C=N—) 1622, (pyridyl) 1483, (C—OH) 1139, 1056. MS (ESILC-MS): m/z Calcd. for [C24H20Cl2N4O2Zn]: 532.73; found [ZnL2 − Cl2 + 1L+ EtOH+ Na]+: 726 (21%), [Zn(L2) − Cl2 + 1L+ EtOH+ Na]+: 727 (10%). Anal. Calcd. (%) for [Zn(L)2Cl2]. C, 54.11; H, 3.78; N, 10.52; found (%): C, 54.11; H, 3.64; N, 10.71.

Experimental details

The structure was solved by the direct method using the SHELXS [2] program and refined. The visual crystal structure information was performed using Mercury [3] system software. The C—H and O—H distances were restrainted to 0.950 Å and 0.84 Å, respectively with Uiso(H) = 1.2Ueq(C) and Uiso(H) = 1.5Ueq(O).

Comment

Schiff base metal complexes are known to be widely studied mainly because of their numerous applications. Most importantly, most Schiff bases are biologically active and the activity can be further enhanced when complexed with transition metals [9]. Reports have shown that Zn is one of the twenty four essential elements in life [10] and it has found usage in medicine for the treatment of ailments such as athletes foot [11], eczema [11], rheumatoid arthritis [12], diabetes [13], ringworms [9], fungi [9], [14] and cancer [15]. Zn2+ is a redox-stable ion with the ability to interact with amino acid residues side chain in proteins [16] by involving in direct chemical catalysis or by maintaining protein structure and stability [16]. This is only possible when in complexed form according to de Fátima et al. [16]. Zn2+ ion showed insignificant activity as anti-urease agents but when complexed with a ligand especially those containing N-donor atom [89], its activity was improved. As such, its coordination to Schiff base ligands will further improve its role as part of a metalloenzymes [17] by contributing to metalloproteins structure and activity.

The asymmetric unit of the title compound contains two symmetrically independent complexes. Each complex contains two pap ligands and two chlorido ligands coordinating to a Zn2+ ion. The two pyridinyl moieties in each molecule coordinate to Zn2+ through the nitrogen atom. Furthermore, the conformation of the coordinated ligands is best described by the dihedral angles between pyridinyl and anilinyl rings in each pap ligand which were found to range between 1.15(5)° and 27.43(6)°. The metal centres adopt a distorted tetrahedral geometry with Npy—Zn—Npy, Cl—Zn—Cl and Npy—Zn—Cl bond angles of 102.69(5)–104.14(5)°, 116.61(1)–118.42(2)° and 104.87(4)–111.66(4)°, respectively. These are in agreement with closely related Zn(II) complexes reported [10], [15], [18], [19]. Intermolecular π⋯π and O—H⋯Cl interactions exist in the crystal.

Award Identifier / Grant number: 119342

Funding statement: We appreciate the University of KwaZulu-Natal and the National Research Foundation of South Africa (Grant number: 119342) for their financial assistance for Ms Adesola A. Adeleke.

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Received: 2019-11-26
Accepted: 2020-01-13
Published Online: 2020-02-12
Published in Print: 2020-04-28

©2020 Adesola A. Adeleke et al., published by De Gruyter.

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

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  23. The crystal structure of (E)-2-(((2-(1H-indol-3-yl)ethyl)iminio)methyl)-6-bromophenolate, C17H15N2BrO
  24. Crystal structure of catena-poly[diaqua-(μ2-oxalyl dihydrazide-κ4N,O:N′,O′)-bis(μ2-pyridine-2,3-dicarboxylato-κ3N,O,O′)dicadmium(II)] hexahydrate, C16H28O18N6Cd2
  25. Crystal structure of poly[tetra-(μ4-naphthalene-1,8-dicarboxylato-κ4O:O,O′: O′′:O′′,O′′′)-(μ4-oxo-κ4O:O:O:O) penta-lead(II)], C48H24O17Pb5
  26. Crystal structure of 5H-dibenzo[c,f][1,5]oxabismocin-12 (7H)-yl acetate, C16H15O3Bi
  27. The crystal structure of 2-(4-chloro-6-nitrophenyl)-1-(4-chloro-3-nitrophenyl)diazene 1-oxide, C12H6Cl2N4O5
  28. Crystal structure of bis(3-methyl-N-(1-(pyrazin-2-yl)ethylidene)benzohydrazonato-κ3O,N,N′)nickel(II), C28H26N8O2Ni
  29. Crystal structure of 3,10-bis(4-chlorophenyl)-6,12-dibenzyl-2,9-acetyl-6,12-diazapentacyclo[6.3.1.02,7.04,11.05,9]-dodecane, C40H36Cl2N2O2
  30. Crystal structure of bis[(μ2-4⋯O,O′:O′)-(4-hydroxybenzoato-κ2O,O′)-(1,10-phenanthroline-κ2N,N′)]-di-lead(II)μ-4-hydroxybenzoato-κ3O,O′:O′3O,O′:O′-bis-[(4-hydroxybenzoato-κ2O,O′)bis(1,10-phenanthroline-κ2N,N′)di-lead(II)] monohydrate, C52H36N4O12Pb2 ⋅ H2O
  31. Crystal structure of poly[diaqua-(μ3-3,4,5,6-tetrafluoro-phthalato-κ3O:O′:O′′)-(μ2-1,2-bis(4-pyridyl)ethene-κ2N:N′)cobalt(II)], C14H9CoF4NO6
  32. Crystal structure of 7-hydroxy-4-phenyl-2H-chromen-2-one, C15H10O3
  33. Crystal structure of 3,7-dimethyl-1-(5-oxohexyl)-3,7-dihydro-1H-purine-2,6-dione 4-hydroxybenzoic acid, C20H24N4O6
  34. Crystal structure of catena-poly[(μ2-1,5-dimethyl-2-phenyl-4-((pyridin-4-ylmethylene)amino)-1,2-dihydro-3H-pyrazol-3-one-κ2N:O)-bis(nitrato-κ1O)zinc(II)], C17H16N6O7Zn
  35. The crystal structure of diaqua-bis(6-aminopicolinato-κ2N,O)magnesium(II), C12H14O6N4Mg
  36. Crystal structure of (pyridine-2-carboxamide-κ2N,O)-[tris((1H-benzo[d]imidazol-2-yl)methyl)amine-κ4N,N′,N′′,N′′′]nickel(II) diperchlorate — methanol (1/3), C33H39Cl2N9NiO12
  37. Crystal structure of catena-poly[diaqua-bis(3-(4-trifluoromethyl-phenyl)-acrylato-κO1)-(μ2-1,4-bis(1-imidazolyl)benzene-κ2N3:N3)cobalt(II)], C32H26CoF6N4O6
  38. Crystal structure of (E)-3-(2-(2-hydroxy-4-methoxystyryl)-3,3-dimethyl-3H-indol-1-ium-1-yl)propane-1-sulfonate monohydrate, C22H25NO5S⋅H2O
  39. The crystal structure of bis(N-oxy-2-(1H-tetrazol-1-yl) acetamide κ2O,O′)-diaqua-zinc(II), C6H12ZnN10O6
  40. Crystal structure of (E)-4-((4-chlorophenylimino)methyl)pyridinium 3,5-dinitrobenzoate, C19H13ClN4O6
  41. Crystal structure of dichlorido-bis((E)-2-((pyridin-4-ylmethylene)amino)phenol)zinc(II), C24H20Cl2N4O2Zn
  42. Crystal structure of cyclo-[tetrachlorido-bis(μ2-p-xylylenediamine-κ2N:N′)dipalladium(II)] dimethyl sulfoxide solvate, C20H36Cl4N4O2Pd2S2
  43. Crystal structure of 4-(3-fluorophenyl)-7-hydroxy-2H-chromen-2-one, C15H9FO3
  44. Crystal structure of (E)-2-((2-(pyrimidin-2-yl)hydrazono)methyl)quinolin-1-ium perchlorate – methanol (1/1), C15H16N5O5Cl
  45. The crystal structure of bis(N-(amino(pyridin-2-yl)methylene)-5-chloro-2-hydroxybenzohydrazonato-κ3N,N′,O)zinc(II) – methanol (2/5), C57H60Cl2N16O13Zn2
  46. Synthesis and crystal structure of 4,4′-di(4-pyridyl)-6,6′-di(tert-butyl)-2,2′-[propylenedioxybis(nitrilomethylidyne)]diphenol, C35H40N4O4
  47. Crystal structure of (3E,3′E)-3,3′-((1,3,4-thiadiazole-2,5-diyl)bis(sulfanediyl))bis(4-hydroxy-4-phenylbut-3-en-2-one), C22H18N2O4S3
  48. Crystal structure of (N-benzyl-N-methyl-dithiocarbamato-κ2S,S′)di(4-chlorobenzyl)chloridotin(IV), C23H22Cl3NS2Sn
  49. Crystal structure of (1,4,7,10,13,16-hexaoxacyclooctadecane-κ6O6) sodium bromide hydrate, [Na(18-crown-6)]Br ⋅ H2O, C12H26BrNaO7
  50. Crystal structure of 7-ethoxyl-6,8-difluoro-4-oxo-1-phenyl-1,4-dihydro-quinoline-3-carboxylic acid, C18H13F2N1O4
  51. Crystal structure of chlorido (2-(4-ethylphenyl)pyrimidine-k2C,N)(triphenylphosphane-kP) palladium(II), C30H26ClN2PPd
  52. Crystal structure of 18-crown-6 – 1,4-diiodotetrafluorobenzene – acetonitrile (1/1/2), C22H30F4I2N2O6
  53. Crystal structure of diisobutyl 2,5-dihydroxycyclohexa-1,4-diene-1,4-dicarboxylate, C16H24O6
  54. Crystal structure of poly[[tris(μ2-cis-1,2-cyclohexanedicarboxylato)-κ2O, O′]-bis[μ3-1,3,5-tris[(1H-imidazol-1-yl)methyl]benzene-κ3N, N′,N′′]-trizinc(II)] – water (1/20), C60H106N12O32Zn3
  55. The synthesis and crystal structure of 5-amino-1-(2,6-dichloro-4-(trifluoromethyl)phenyl)-4-((trifluoromethyl)sulfinyl)-1H-pyrazole-3-carboxamide–tetrahydrofuran (1/1), C16H14N4Cl2F6O3S
  56. Crystal structure of dimethylbis(diisopropyldithiocarbamato-κ2S,S′)tin(IV), C16H34N2S4Sn
  57. Crystal structure of diisopropyl 2,5-dihydroxycyclohexa-1,4-diene-1,4-dicarboxylate, C14H20O6
  58. The synthesis and crystal structure of ethyl (E)-1-(2,6-dichloro-4-(trifluoromethyl)phenyl)-5-((2-methoxybenzylidene)amino)-4-((trifluoromethyl)sulfinyl)-1H-pyrazole-3-carboxylate, C22H15N3Cl2F6O4S
  59. The crystal structure of a matrine derivative, 13-(methylamine-1-yl) carbodithioate matrine, C17H27N3OS2
  60. Crystal structure of bis(2-hydroxy-6-((phenylimino)methyl)phenolato-κ2N,O)copper(II), C26H20CuN2O4
  61. The crystal structure of 2-p-fluorophenyl-5-dihydroxymethyl-1,3,4-oxadiazole, C9H7FN2O3
  62. Crystal structure of dichloridobis(4-chlorophenyl-κC1)(1,10-phenanthroline-κ2N,N′)tin(IV), C24H16Cl4N2Sn
  63. Crystal structure of bis{bromido-triphenyltin(IV)}(μ2-[4,4′-bipyridine]1,1′-dioxide-κ2O:O′), C46H38Br2N2O2Sn2
  64. Crystal structure of 2-(5-chloro-quinolin-8-yloxy)-N-quinolin-8-yl-acetamide, C20H14N3O2Cl
  65. Crystal structure of bis(N-(1-(3-ethylpyrazin-2-yl)ethylidene)-3-hydroxy-2-naphthohydrazonato-κ3N,N′,O)cobalt(II) — dimethylformamide (1/1), C41H41N9O5Co
  66. Crystal structure of bis[2-(1-(3-ethylpyrazin-2-yl)ethylidene)-1-tosylhydrazin-1-ido-κ3-N,N′,O]copper(II), C30H34N8O4S2Cu
  67. Crystal structure of (2-p-tolylpyrimidine-κ2C,N)(triphenylphosphane-κP) palladium(II), C29H24ClN2PPd
  68. Halogen bonding in crystal structure of bis(1,4,7,10-tetraoxacyclododecane-κ4O,O′,O′′,O′′′)cesium triiodide, C16H32CsI3O8
  69. The synthesis and crystal structure of N-(3-cyano-1-(2,6-dichloro-4-(trifluoromethyl)phenyl)-4-(trifluoromethylsulfinyl)-1H-pyrazol-5-yl)-2-phenylacetamide, C20H10N4Cl2F6O2S
  70. The crystal structure of 4-(trifluoromethyl)nicotinic acid, C7H4F3NO2
  71. Crystal structure of 3-(2-methylbenzyl)thiazolidin-2-one, C11H13ONS
  72. The crystal structure of 2,2,2-trifluoro-1-(isoquinolin-1-yl)ethane-1,1-diol, C11H8F3NO2
  73. The crystal structure of 3-bromoisonicotinic acid, C6H4BrNO2
  74. The crystal structure of 5-nitropicolinic acid monohydrate, C6H6N2O5
  75. The crystal structure of 3-(4-hydroxybenzyl)-1,5-dioxaspiro[5.5]undecane-2,4-dione, C16H18O5
  76. Crystal structure of [[Mo3Se7(S2CNEt2)3]2(μ-Se)] ⋅ 2(C6H4Cl2), C42H68Cl4Mo6N6S12Se15
  77. Crystal structure of (E)-4-hydroxy-3-((5-phenyl-1,3,4-oxadiazol-2-yl)thio)pent-3-en-2-one, C13H12N2O3S
  78. The crystal structure of (2,3-dioxo-5,6:13,14-dibenzo-9,10-benzo-1,4,8,11-7, 11-diene-κ4N,N′,N′′,N′′′)-nickel(II), Ni(C22H14N4O2)
  79. Crystal structure of 3-(1-benzyl-2-ethyl-4-nitro-1H-imidazol-5-ylthio)-propanoic acid, C15H17N3O4S
  80. The crystal structure of dichlorobis(2-(dicyclohexylphosphino)-2′,4′,6′-tri-i-propyl-1,1′-biphenyl) palladium(II)-dichloroform, C68H100Cl8P2Pd
  81. Crystal structure and antimicrobial properties of (1,4,7,10-tetraoxacyclododecane-κ4O,O′,O′′,O′′′)cesium(I) pentaiodide, C16H32CsI5O8
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