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1.  Chlorido{4-cyclo­hexyl-1-[1-(pyridin-2-yl-κN)ethyl­idene]thio­semicarbazidato-κ2 N 1,S}diphenyl­tin(IV) 
The distorted octa­hedral geometry about the SnIV atom in the title compound, [Sn(C6H5)2(C14H19N4S)Cl], is defined by the N,N,S-tridentate Schiff base ligand, two mutually trans ipso-C atoms of the Sn-bound phenyl groups, and the Cl atom which is trans to the azo N atom. The two five-membered chelate rings and pyridyl ring are almost coplanar with the dihedral angle between the outer five-membered chelate and pyridine rings being 5.39 (8)°. Centrosymmetric dimers feature in the crystal packing mediated by N—H⋯S hydrogen bonds, leading to eight-membered {⋯HNCS}2 synthons. The dimeric aggregates are connected into a three-dimensional architecture by C—H⋯Cl and C—H⋯π inter­actions, as well as π–π inter­actions occurring between centrosymmetrically related pyridine rings [centroid–centroid distance = 3.6322 (13) Å].
PMCID: PMC3343835  PMID: 22589809
2.  6-[(2E)-3,7-Dimethyl­octa-2,6-dien-1-yl]-5,7-dihy­droxy-8-(2-methyl­butano­yl)-4-phenyl-2H-chromen-2-one–6-[(2E)-3,7-dimethyl­octa-2,6-dien-1-yl]-5,7-dihy­droxy-8-(3-methyl­butano­yl)-4-phenyl-2H-chromen-2-one (1/1) from Mesua elegans 1  
The title co-crystal, C30H34O5·C30H34O5, comprises a 1:1 mixture of two mostly superimposed mol­ecules with the same chemical formula that differ in the nature of the substituent (2-methyl­butanoyl or 3-methyl­butano­yl) bound at the exocyclic ketone. The lactone ring is close to planar (r.m.s. deviation = 0.058 Å) and the phenyl ring is twisted out of this plane [dihedral angle = 60.08 (9)°]. The geranyl substituent is almost normal to benzene ring to which it is connected [C—C—Car—Car (ar = aromatic) torsion angle = −87.8 (2)°]. Intra­molecular O—H⋯O and O—H⋯π inter­actions are formed. In the crystal, supra­molecular chains are formed along the a axis owing to C—H⋯O contacts, with the lactone carbonyl atom accepting two such bonds.
PMCID: PMC3343921  PMID: 22590002
3.  1-Meth­oxy-4-methyl-9,10-anthraquinone 
The non-H atoms of the title compound, C16H12O3, lie approximately in a common plane (r.m.s. deviation = 0.032 Å). The methyl C atom is forced away from the carbonyl O atom which can be seen by the widened Cfused ring–Cbenzene–Cmeth­yl angle of 125.8 (2)°.
PMCID: PMC3247377  PMID: 22219995
4.  Rauniticine-allo-oxindole B methanol monosolvate 
The title penta­cyclic oxindole alkadoid, isolated from Uncaria longiflora, crystallizes as a methanol solvate, C20H22N2O4·CH4O. The five-membered ring comprising the indole fused ring is nearly planar [maximum atomic deviation = 0.031 (2) Å], whereas the five-membered ring having alphatic C atoms adopts an envelope shape (with the tertiary N atom representing the flap). The six-membered ring that shares an N atom with the envelope-shaped ring adopts a chair shape; the six-membered ring having an O atom is sofa-shaped. The carb­oxy­lic acid group acts as a hydrogen-bond donor to a methanol mol­ecule; this, in turn, acts as a hydrogen-bond donor to the double-bond carboxyl O atom of an adjacent mol­ecule, generating a chain. Adjacent chains are linked by N—H⋯O hydrogen bonds, forming a layer motif.
PMCID: PMC3120594  PMID: 21754740
5.  3-Acetyl-5-hy­droxy-2-methyl­anthra[1,2-b]furan-6,11-dione 
The asymmetric unit of the title compound, C19H12O5, contains two independent mol­ecules, both slightly buckled along an axis passing through the C=O bonds of the anthraquinone ring system (r.m.s. deviation of non-H atoms = 0.082 and 0.148 Å): the benzene rings are twisted to each other by 4.3 (3)°in one mol­ecule and 10.6(3)° in the other. In both mol­ecules, the hy­droxy group forms an intra­molecular O—H⋯O hydrogen bond. The two independent mol­ecules inter­act by π–π stacking with a centroid–centroid distance of 3.539 (2) Å between hy­droxy­benzene rings of adjacent mol­ecules.
PMCID: PMC3089359  PMID: 21754452
6.  Aqua­chlorido{2-[2-(cyclo­hexyl­carbamo­thioyl-κS)hydrazinyl­idene-κN 1]propano­ato(2−)}phenyl­tin(IV) 
In the title organotin compound, [Sn(C6H5)(C10H15N3O2S)Cl(H2O)], the Sn atom is coordinated by the S, O, and imine N atoms of the dinegative tridentate ligand, a chloride ligand, the ipso-C atom of a phenyl ligand and by a water mol­ecule in a distorted octa­hedral coordination environment. Coordin­ated water mol­ecules link the organotin mol­ecules by forming O—H⋯O hydrogen bonds with both carbonyl and carboxyl­ate O atoms, leading to 12-membered {⋯OCO⋯HOH⋯}2 synthons. This results in the formation of supra­molecular chains along the c axis. The chains pack in the ac plane and stack along the b axis with links between layers afforded by N—H⋯Cl hydrogen bonds.
PMCID: PMC3007908  PMID: 21588519
7.  (2,2′-Bipyridine-κ2 N,N′)bis­(N-ethyl-N-phenyl­dithio­carbamato-κ2 S,S′)cadmium(II) chloro­form solvate 
In the title compound, [Cd(C9H10NS2)2(C10H8N2)]·CHCl3, the CdII atom exists in an all-cis distorted octa­hedral geometry. Chelation is isobidentate for one dithio­carbamate ligand and anisobidentate for the other. The chloroform solvent mol­ecule is disordered over two positions of equal occupancy.
PMCID: PMC2971268  PMID: 21578118
8.  1,3-Dihydr­oxy-2-methoxy­methyl-9,10-anthraquinone from Rennellia elliptica Korth. 
The title compound, C16H12O5, common name: lucidin ω-methyl ether, exists as a planar mol­ecule (r.m.s. deviation = 0.04 Å). Within the mol­ecule, the 1-hydr­oxy group forms a hydrogen bond to the adjacent carbonyl O atom, and the 3-hydr­oxy group forms a hydrogen bond to the adjacent meth­oxy O atom. The meth­oxy O atom is disordered over two positions of equal occupancy.
PMCID: PMC2969543  PMID: 21583274
9.  1-Hydr­oxy-2-meth­oxy-6-methyl-9,10-anthraquinone from Rennellia elliptica Korth. 
The title compound, C16H12O4, exists as planar molecules in the solid state (r.m.s. deviation of 0.02 Å in one mol­ecule and 0.07 Å in the second independent mol­ecule comprising the asymmetric unit). In each mol­ecule, the 1-hydr­oxy group forms an intra­molecular hydrogen bond to the adjacent carbonyl O atom.
PMCID: PMC2969574  PMID: 21583275
10.  2-Formyl-3-hydr­oxy-9,10-anthroquinone 
The mol­ecule of the title compound, C15H8O4, is approximately planar. An intra­molecular O—H⋯O hydrogen bond is observed between the hydr­oxy and formyl groups. The crystal used was a nonmerohedral twin, with a minor twin component of 15.9%.
PMCID: PMC2959712  PMID: 21581024

Results 1-10 (10)