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1.  5-Methyl-1H-indole-3-carbaldehyde 
The title mol­ecule, C10H9NO, is almost planar with an r.m.s. deviation for all non-H atoms of 0.0115 Å. In the crystal, mol­ecules are connected through N—H⋯O hydrogen bonds into chains running along [021]. The chains are further connected via C—H⋯π inter­actions, forming layers in the bc plane.
doi:10.1107/S1600536812034873
PMCID: PMC3435712  PMID: 22969583
2.  (3Z,3′E)-3,3′-[Cyclo­hexane-1,2-diylbis(aza­nylyl­idene)]bis­(indolin-2-one) N,N-dimethyl­formamide monosolvate dihydrate 
In the Schiff base mol­ecule of the title compound, C22H20N4O2·C3H7NO·2H2O, the cyclo­hexane ring adopts a chair conformation with the two imine groups linked at the equatorial positions. The two indolin-2-one ring systems make a dihedral angle of 65.63 (5)°. In the crystal, the Schiff base mol­ecules are connected through bifurcated N—H⋯(O,N) hydrogen bonds, forming inversion dimers. The water molecules link the dimers and the dimethylformamide molecules via O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds. Together with C—H⋯π and π–π [centroid–centroid distance = 3.3889 (10) Å] inter­actions a three-dimensional supra­molecular structure is formed.
doi:10.1107/S1600536812026335
PMCID: PMC3393919  PMID: 22798784
3.  1,5-Bis(2-oxoindolin-3-yl­idene)thio­carbonohydrazide tetra­hydro­furan monosolvate 
In the thio­carbonohydrazide mol­ecule of the title compound, C17H12N6O2S·C4H8O, the terminal indolin-2-one ring systems make a dihedral angle of 20.13 (6)° with each other. Two intra­molecular N—H⋯O hydrogen bonds are present, each of which generates an S(6) ring. In the crystal, N—H⋯O hydrogen bonds lead to a mol­ecular chain running along the b axis. The tetra­hydro­furan solvent mol­ecule is disordered over two orientations in a 0.561 (11):0.439 (11) ratio.
doi:10.1107/S1600536812022714
PMCID: PMC3379434  PMID: 22719632
4.  4-Hy­droxy-3-meth­oxy­benzaldehyde–nicotinamide (1/1) 
In the title compound, C6H6N2O·C8H8O3, an equimolar co-crystal of nicotinamide and vanillin, the aromatic ring and the amide fragment of the nicotinamide mol­ecule make a dihedral angle of 32.6 (2)°. The vanillin mol­ecule is almost planar, with an r.m.s. deviation for all non-H atoms of 0.0094 Å. The vaniline and nicotinamide aromatic rings are nearly coplanar, the dihedral angle between them being 3.20 (9)°. In the crystal, the two components are linked through N—H⋯O and O—H⋯N hydrogen bonds into chains along the a axis. The chains are connected via C—H⋯O inter­actions, forming a three-dimensional polymeric structure.
doi:10.1107/S1600536811045648
PMCID: PMC3238839  PMID: 22199692
5.  2-{[2-(Piperazin-4-ium-1-yl)ethyl­iminio]meth­yl}phenolate 0.06-chloride 0.94-perchlorate 
The structure of the title salt, C13H20N3O+·0.94ClO4 −·0.06Cl−, contains a zwitterionic Schiff base with a net positive charge and a perchlorate anion having substitutional disorder with Cl. In the cation, the azomethine N atom is protonated and donates hydrogen bonds to the phenolate O atom and to the tertiary N atom of the piperazine ring. In the crystal, two Schiff base mol­ecules are linked about a center of inversion by a pair of N—H⋯O hydrogen bonds. The resulting dimers are N—H⋯O and C—H⋯O hydrogen bonded to the perchlorate anions, forming a three-dimensional structure. The network is further consolidated by C—H⋯π inter­actions.
doi:10.1107/S1600536811042255
PMCID: PMC3247388  PMID: 22220006
6.  3-(3-Chloro-2-hy­droxy­phen­yl)-1-phenyl-1H-pyrazole-4-carbaldehyde 
In the title compound, C16H11ClN2O2, the pyrazole ring makes dihedral angles of 11.88 (13) and 22.33 (13)° with the 3-chloro-2-hy­droxy­benzene group and phenyl rings, respectively. The phenolic hy­droxy group forms an intra­molecular O—H⋯N hydrogen bond with the imine N atom of the pyrazole unit. The formyl group is virtually coplanar with the pyrazole ring [dihedral angle = 4.5 (19)°] and acts as an acceptor in an intra­molecular C—H⋯O hydrogen bond closing seven-membered ring. In the crystal, adjacent mol­ecules are linked through C—H⋯O hydrogen bonds into infinite chains along the b axis.
doi:10.1107/S1600536811038025
PMCID: PMC3201353  PMID: 22058800
7.  4-(2-Azaniumyl­eth­yl)piperazin-1-ium bis(perchlorate) 
In the title compound, C6H17N3 2+·2ClO4 −, the piperazine ring adopts a chair conformation with the ethyl­ammonium fragment occupying an equatorial position. In the crystal, the dications and perchlorate anions are linked through N—H⋯O hydrogen bonding and weak C—H⋯O hydrogen bonding into a three-dimensional supra­molecular network.
doi:10.1107/S1600536811033976
PMCID: PMC3200960  PMID: 22064357
8.  3,4,5-Trihy­droxy­benzohydrazidium perchlorate–3,4,5-trihy­droxy­benzohydrazide–water (1/1/1) 
The crystal studied of the title compound, C7H9N2O4 +·ClO4 −·C7H8N2O4·H2O, was found to be a racemic twin with a 0.72 (18):0.28 (18) domain ratio. The hydrazidium group is close to planar, with an r.m.s deviation of 0.105 Å; the hydrazide group deviates more from planarity, with an r.m.s deviation of 0.174 Å. In the crystal, the hydrazidium cation, hydrazide mol­ecule, perchlorate anions and water mol­ecules are linked through O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds into a three-dimensional supra­molecular network. In addition, the benzene rings of the hydrazidium and hydrazide units are connected via π–π inter­actions into infinite chains along the c axis; the centroid–centroid distances are 3.486 (3) and 3.559 (3) Å.
doi:10.1107/S1600536811030595
PMCID: PMC3200764  PMID: 22058903
9.  Hexachloridobis­{μ2-2-(piperazin-1-yl)-N-[1-(2-pyrid­yl)ethyl­idene]ethanamine}­trizinc dihydrate 
In the trinuclear title compound, [Zn3Cl6(C13H20N4)2]·2H2O, each terminal ZnII atom is coordinated by an N3 donor set from the Schiff base ligands and two Cl atoms in a distorted square-pyramidal geometry. The central ZnII atom is tetra­hedrally coordinated by two piperazine N atoms from two Schiff base ligands and two Cl atoms. The piperazine rings adopt chair conformations. In the crystal structure, adjacent complex mol­ecules are linked into a three-dimensional network via N—H⋯O, C—H⋯Cl and C—H⋯O hydrogen bonds. The structure includes two water mol­ecules, one of which is disordered over two positions with occupancies of 0.753 (15) and 0.247 (15).
doi:10.1107/S1600536811027437
PMCID: PMC3212165  PMID: 22090867
10.  Aqua­chloridobis(2-{[3-(morpholin-4-yl)prop­yl]imino­meth­yl}phenolato)manganese(III) monohydrate 
In the title compound, [Mn(C14H19N2O2)2Cl(H2O)]·H2O, the MnIII atom is N,O-chelated by two monoanionic Schiff bases, forming two six-membered chelate rings. One Cl atom and one water mol­ecule in trans positions complete a distorted octa­hedral geometry around the metal atom. In the crystal, the complex mol­ecules and the uncoordinated water mol­ecules are connected via O—H⋯N, O—H⋯O and O—H⋯Cl hydrogen bonds into layers parallel to the ac plane and these are consolidated by C—H⋯π inter­actions. The layers are further linked into a three-dimensional network through C—H⋯O inter­actions.
doi:10.1107/S1600536811026493
PMCID: PMC3212133  PMID: 22090835
11.  Dipotassium disulfanilamidate trihydrate 
The asymmetric unit of the title compound, 2K+·2C6H7N2O2S−·3H2O, consists of two potassium cations located on mirror planes, one sulfanilamidate anion in a general position and one and a half mol­ecules of water, one of which is also located on a mirror plane. One potassium cation is seven-coordinated by six sulfonyl O atoms and one water mol­ecule, whereas the other is surrounded by six water O atoms and two sulfonyl O atoms. In the crystal structure, the components are connected into polymeric sheets in the bc plane. The two-dimensional structure is consolidated by N—H⋯O, O—H⋯O, O—H⋯N and C—H⋯π inter­actions. The layers are further linked into a three-dimensional network via N—H⋯O, N—H⋯N and O—H⋯N hydrogen bonds.
doi:10.1107/S1600536811026791
PMCID: PMC3212149  PMID: 22090851
12.  Dichlorido{N,N-dimethyl-N′-[1-(2-pyrid­yl)ethyl­idene]ethane-1,2-diamine-κ3 N,N′,N′′}zinc 
The asymmetric unit of the title compound, [ZnCl2(C11H17N3)], contains two independent penta­coordinate ZnII complex mol­ecules. In each mol­ecule, the metal atom is coordinated by an N,N′,N′′-tridenate Schiff base and two Cl atoms in a distorted square-pyramidal geometry. The two mol­ecules differ little in their geometry, but more in their inter­molecular inter­actions. In the crystal, adjacent mol­ecules are connected via C—H⋯Cl inter­actions into a three-dimensional supra­molecular structure. The network is supplemented by π–π inter­actions formed between the aromatic rings of pairs of the symmetry-related mol­ecules [centroid–centroid distances = 3.6255 (10) and 3.7073 (10) Å]. The crystal lattice contains void spaces with a size of 52 Å3.
doi:10.1107/S1600536811025669
PMCID: PMC3212119  PMID: 22090821
13.  Dichlorido(4-meth­oxy-2-{[2-(piperazin-4-ium-1-yl)eth­yl]imino­meth­yl}phenol­ate)cadmium 
In the title compound, [CdCl2(C14H21N3O2)], the Schiff base ligand chelates the CdII ion in an N,N,O-tridentate fashion. Two Cl atoms complete a distorted square-pyramidal coordination environment around the metal atom. In the crystal, adjacent mol­ecules are linked through C—H⋯π inter­actions into infinite chains along the a axis. The mol­ecules are further connected into a three-dimensional network via N—H⋯O, N—H⋯Cl and C—H⋯Cl inter­actions. The ethyl­ene group is disordered over two sets of sites in a 0.520 (10):0.480 (10) ratio.
doi:10.1107/S1600536811022100
PMCID: PMC3151769  PMID: 21836911
14.  Aqua{2-(morpholin-4-yl)-N-[1-(2-pyri­dyl)ethyl­idene]ethanamine-κ3 N,N′,N′′}bis­(thio­cyanato-κN)manganese(II) 
In the title compound, [Mn(NCS)2(C13H19N3O)(H2O)], the Schiff base acts as an N,N′,N"-tridentate ligand, forming two five-membered chelating rings with the MnII atom. The distorted octa­hedral geometry around the metal atom is completed by two cis-positioned N-bound thio­cyanate ligands and one water mol­ecule. In the crystal, adjacent mol­ecules are linked through O—H⋯O, O—H⋯S and C—H⋯S hydrogen bonds into a three-dimensional supra-mol­ecular structure. An intra­molecular C—H⋯O hydrogen bond also occurs.
doi:10.1107/S1600536811022124
PMCID: PMC3151779  PMID: 21836912
15.  8-Chloro-6-iodo-2-phenyl­chromeno[4,3-c]pyrazol-4(2H)-one N,N-dimethyl­formamide monosolvate 
In the title compound, C16H8ClIN2O2·C3H7NO, the fused tricyclic pyrazolo­coumarin ring and the N-phenyl ring are almost coplanar, the dihedral angle between them being 1.86 (9)°. In the crystal, these rings stack on top of each other via π–π inter­actions [centroid–centroid distances = 3.489 (2), 3.637 (2), 3.505 (2) and 3.662 (2) Å], forming infinite chains along the a axis. The chains are connected into layers parallel to ac plane through I⋯O inter­actions [3.0011 (18) Å] between pairs of symmetry-related mol­ecules. The DMF solvent mol­ecules are C—H⋯O bonded to this network.
doi:10.1107/S1600536811022070
PMCID: PMC3151794  PMID: 21837089
16.  Dichlorido(2-{[3-(morpholin-4-ium-4-yl)prop­yl]imino­meth­yl}phenolate)zinc 
In the zwitterionic zinc title complex, [ZnCl2(C14H20N2O2)], the ZnII ion is four-coordinated in a distorted tetra­hedral geometry. The Schiff base ligand employs its phenolate O and imine N atoms to coordinate the metal atom in a bidentate mode. Two Cl atoms complete the tetra­hedral coordination environment. In the crystal, a pair of N—H⋯O hydrogen bonds connect the mol­ecules into a centrosymmetric dimer. C—H⋯O, C—H⋯Cl and C—H⋯π inter­actions are also observed.
doi:10.1107/S1600536811022021
PMCID: PMC3151802  PMID: 21836916
17.  {N,N-Dimethyl-N′-[1-(2-pyrid­yl)ethyl­idene]ethane-1,2-diamine-κ3 N,N′,N′′}bis­(thio­cyanato-κN)copper(II) 
The asymmetric unit of the title compound, [Cu(NCS)2(C11H17N3)], consists of two crystallographically independent mol­ecules. In each mol­ecule, the CuII ion is five-coordinated in a distorted square-pyramidal geometry wherein the basal plane is defined by the N,N′,N"-tridentate Schiff base and one N-bound thio­cyanate ligand. The second N-donor thio­cyanate group, located at the apical site, completes the coordination environment. In the crystal, inter­molecular C—H⋯S and C—H⋯N hydrogen bonds link adjacent mol­ecules into infinite layers parallel to the ac plane. Intra­molecular C—H⋯N inter­actions are also observed.
doi:10.1107/S1600536811022057
PMCID: PMC3151817  PMID: 21836914
18.  Bis(μ-2-{1-[2-(dimethyl­amino)­ethyl­imino]­eth­yl}phenolato)bis­[bromido­copper(II)] monohydrate 
In the centrosymmetric dinuclear copper(II) title complex, [Cu2Br2(C12H17N2O)2]·H2O, each CuII ion is five coordinated in a square-pyramidal geometry by the N,N′,O-tridentate Schiff base, one Br atom and the bridging O atom of the centrosymmetrically related Schiff base. In the crystal, the water mol­ecules link the complex mol­ecules into infinite chains along the b axis via O—H⋯Br and C—H⋯O hydrogen bonds.
doi:10.1107/S1600536811022045
PMCID: PMC3151890  PMID: 21836915
19.  Bis[3,3-dimethyl-2-(2-oxoethyl­idene)indolinyl-κ2 N,O]palladium(II) 
The asymmetric unit of the title compound, [Pd(C12H12NO)2], consists of three crystallographically independent half-mol­ecules. Each PdII atom lies on a center of inversion and is four-coordinated by two monoanionic forms of the amino­acryl­aldehyde in a square-planar geometry. In the crystal, adjacent mol­ecules are connected through C—H⋯π and C—H⋯O inter­actions into a three-dimensional polymeric structure.
doi:10.1107/S1600536811022069
PMCID: PMC3152092  PMID: 21836913
20.  Diiodido{2-(morpholin-4-yl)-N-[1-(2-pyrid­yl)ethyl­idene]ethanamine-κ3 N,N′,N′′}zinc 
In the title compound, [ZnI2(C13H19N3O)], the ZnII ion is five-coordinated in a distorted square-pyramidal geometry, in which the basal plane is defined by three N atoms from the Schiff base ligand and one iodide ion. A second iodide ligand, situated in the apical position, completes the coordination geometry. In the crystal structure, C—H⋯O hydrogen bonds link a pair of mol­ecules around an inversion centre into a dimer.
doi:10.1107/S1600536811014656
PMCID: PMC3089331  PMID: 21754337
21.  Aqua­{N,N-dimethyl-N′-[1-(2-pyrid­yl)ethyl­idene]ethane-1,2-diamine-κ3 N,N′,N′′}bis­(thio­cyanato-κN)nickel(II) 
In the title compound, [Ni(NCS)2(C11H17N3)(H2O)], the NiII ion is six-coordinated by the N,N′,N"-tridentate Schiff base N atoms, two cis-positioned N-bound isothio­cyanate groups and one water mol­ecule. In the crystal, O—H⋯S hydrogen bonds link adjacent mol­ecules into infinite layers parallel to the ac plane. The layers are further connected into a three-dimensional network via C—H⋯π inter­actions. The –CH2–N(CH3)2 fragment is disordered over two sets of sites in a 0.556 (5):0.444 (5) ratio.
doi:10.1107/S1600536811011512
PMCID: PMC3099768  PMID: 21754017
22.  catena-Poly[[{N,N-dimethyl-N′-[1-(pyridin-2-yl)ethyl­idene]ethane-1,2-diamine-κ3 N,N′,N′′}(thio­cyanato-κN)cadmium]-μ-thio­cyanato-κ2 S:N] 
In the title compound, [Cd(NCS)2(C11H17N3)]n, the CdII atom is octa­hedrally coordinated by the N,N′,N′′-tridentate Schiff base ligand and one terminal thio­cyanate N atom. Two trans-N:S-bridging thio­cyanates complete the N5S donor set around the Cd atom. In the crystal, adjacent CdII ions are linked by the thio­cyanate N:S-bridges into polymeric chains along the c axis.
doi:10.1107/S1600536811010063
PMCID: PMC3099776  PMID: 21753992
23.  trans-Diaqua­bis­(cyclo­hexane-1,2-diamine)­zinc(II) dichloride 
In the title compound, [Zn(C6H14N2)2(H2O)2]Cl2, the Zn(II) atom resides on a special position with site symmetry 2/m and is octa­hedrally coordinated by four N atoms from two trans 1,2-diamino­cyclo­hexane ligands and two water O atoms. In the crystal, N—H⋯Cl and O—H⋯Cl hydrogen bonds link the mol­ecules into a two-dimensional network parallel to the bc plane.
doi:10.1107/S1600536811008166
PMCID: PMC3099959  PMID: 21753950
24.  Dichlorido{N,N-dimethyl-N′-[1-(pyridin-2-yl)ethyl­idene]ethane-1,2-diamine-κ3 N,N′,N′′}cadmium 
In the title compound, [CdCl2(C11H17N3)], the Schiff base acts as an N,N′,N′′-tridentate ligand towards the CdII ion. Two Cl atoms complete a distorted square-pyramidal geometry around the metal atom. In the crystal, a C—H⋯Cl inter­action connects pairs of mol­ecules into centrosymetric dimers.
doi:10.1107/S1600536811005538
PMCID: PMC3051925  PMID: 21522277
25.  Dibromido{2-(morpholin-4-yl)-N-[1-(2-pyrid­yl)ethyl­idene]ethanamine-κ3 N,N′,N′′}cadmium 
The CdII ion in the title compound, [CdBr2(C13H19N3O)], is five-coordinated by the N,N′,N′′-tridentate Schiff base ligand and two Br atoms in a distorted square-pyramidal geometry. In the crystal, inter­molecular C—H⋯O and C—H⋯Br hydrogen bonds link adjacent mol­ecules into layers parallel to the ab plane. An intra­molecular C—H⋯Br inter­action is also observed.
doi:10.1107/S160053681100554X
PMCID: PMC3052017  PMID: 21522276

Results 1-25 (88)