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1.  N,N-Dimethyl-4-(pyren-1-yl)aniline 
In the title compound, C24H19N, the di­methyl­amino group is inclined to the benzene ring by 2.81 (9)°. Their mean plane makes a dihedral angle of 64.12 (2)° with the mean plane of the pyrene ring system [r.m.s. deviation = 0.031 (1) Å]. In the crystal, mol­ecules are linked via C—H⋯π inter­actions, which connect neighbouring mol­ecules into columns along the c axis.
doi:10.1107/S1600536813032698
PMCID: PMC3914066  PMID: 24526967
2.  [Hexane-2,5-dione bis­(thio­semi­carba­zon­ato)]nickel(II) 
In the title compound, [Ni(C8H14N6S2)], the NiII ion is coordinated by N2S2 donor atoms of the tetradentate thio­semicarbazone ligand, and has a slightly distorted square-planar geometry. In the crystal, inversion-related mol­ecules are linked via pairs of N—H⋯N and N—H⋯S hydrogen bonds, forming R 2 2(8) ring motifs. Mol­ecules are further linked by slightly weaker N—H⋯N, N—H⋯S and C—H⋯S hydrogen bonds, forming two-dimensional networks which lie parallel to the bc plane.
doi:10.1107/S1600536813012816
PMCID: PMC3684884  PMID: 23794986
3.  Ethyl 4-(5-bromo-2-hy­droxy­phen­yl)-2,7,7-trimethyl-5-oxo-1,4,5,6,7,8-hexa­hydro­quinoline-3-carboxyl­ate 
In the title compound, C21H24BrNO4, the dihedral angle between the heterocyclic ring and the pendant aromatic ring is 80.20 (13)°. The hexahydroquinone [i.e. the one with the C=O group] ring adopts a sofa conformation. An intra­molecular O—H⋯O hydrogen bond generates an S(6) ring motif. The ethyl group is disordered over two sets of sites with a refined site occupancy ratio of 0.633 (10):0.366 (10). In the crystal, mol­ecules are linked by N—H⋯O inter­actions, forming chains parallel to [101]. There are no significant C—H⋯π or π–π inter­actions in the crystal structure.
doi:10.1107/S1600536813006739
PMCID: PMC3629593  PMID: 23634080
4.  1,1′-Bis(tert-butyl­dimethyl­sil­yl)ferrocene 
The asymmetric unit of the title compound, [Fe(C11H19Si)2], consists of one half of a ferrocene derivative. The FeII atom lies on a twofold rotation axis, giving an eclipsed conformation for the cyclo­penta­dienyl ligands. No significant inter­molecular inter­actions are observed in the crystal structure.
doi:10.1107/S1600536812049069
PMCID: PMC3588248  PMID: 23476342
5.  {4,4′-Dimeth­oxy-2,2′-[2,2-dimethyl­propane-1,3-diylbis(nitrilo­methanylyl­idene)]diphenolato}copper(II) monohydrate 
The asymmetric unit of the title compound, [Cu(C21H24N2O4)]·H2O, comprises half of a Schiff base complex and a water mol­ecule. The CuII atom, water mol­ecule and one C atom of the central propyl­ene segment are located on a twofold rotation axis. The geometry around the CuII atom is distorted square-planar, supported by the N2O2 donor atoms of the coordinating ligand. The dihedral angle between the symmetry-related benzene rings is 42.56 (19)°. In the crystal, O—H⋯O hydrogen bonds involving the water mol­ecule make an R 2 1(6) ring motif. Complex mol­ecules are linked into a chain along the c axis via C—H⋯O inter­actions.
doi:10.1107/S1600536812038135
PMCID: PMC3470142  PMID: 23125586
6.  {4,4′-Dimethyl-2,2′-[2,2-dimethyl­propane-1,3-diylbis(nitrilo­methanylyl­idene)]diphenolato}copper(II) monohydrate 
The asymmetric unit of the title compound, [Cu(C21H24N2O2)]·H2O, comprises half of a Schiff base complex and half of a water mol­ecule. The whole compound is generated by crystallographic twofold rotation symmetry. The geometry around the CuII atom, located on a twofold axis, is distorted square-planar, which is supported by the N2O2 donor atoms of the coordinating Schiff base ligand. The dihedral angle between the symmetry-related benzene rings is 47.5 (4)°. In the crystal, the water mol­ecule that is hydrogen bonded to the coordinated O atoms links the mol­ecules via O—H⋯O inter­actions into chains parallel to [001]. The crystal structure is further stabilized by C—H⋯π inter­actions, and by π–π inter­actions involving inversion-related chelate rings [centroid–centroid distance = 3.480 (4) Å].
doi:10.1107/S1600536812034502
PMCID: PMC3435595  PMID: 22969468
7.  An ortho­rhom­bic polymorph of 2-(1,3-benzothia­zol-2-yl)-6-eth­oxy­phenol 
In the title mol­ecule, C15H13NO2S, an intra­molecular O—H⋯N hydrogen bond forms an S(6) ring motif. The benzothia­zole ring system and the benzene ring form a dihedral angle of 8.9 (3) Å. In the crystal, mol­ecules are linked by weak C—H⋯O hydrogen bonds, forming chains along the b axis. In addition, π–π inter­actions [centroid–centroid distances = 3.772 (4) and 3.879 (4) Å] are observed.
doi:10.1107/S1600536812033879
PMCID: PMC3435656  PMID: 22969529
8.  4-Bromo-2-[(E)-(2-{2-[(2-{[(E)-5-bromo-2-hy­droxy­benzyl­idene]amino}­phen­yl)sulfan­yl]ethyl­sulfan­yl}phen­yl)imino­meth­yl]phenol 
The asymmetric unit of the title compound, C28H22Br2N2O2S2, comprises half of a Schiff base ligand, the whole mol­ecule being generated by a crystallographic inversion center located at the mid-point of the C—C bond of the central methyl­ene segment. Intra­molecular O—H⋯N and O—H⋯S hydrogen bonds make S(6) and S(5) ring motifs, respectively. In the crystal, there are no significant inter­molecular inter­actions.
doi:10.1107/S1600536812034071
PMCID: PMC3435662  PMID: 22969535
9.  {4,4′-Dichloro-2,2′-[2,2-dimethyl­propane-1,3-diylbis(nitrilo­methanylyl­idene)]diphenolato}copper(II) 
In the title Schiff base complex, [Cu(C19H18Cl2N2O2)], the CuII ion is coordinated in a distorted square-planar environment by two N atoms and two O atoms of the tetra­dentate ligand. The dihedral angle between the benzene rings is 36.86 (14)°. In the crystal, mol­ecules are linked into inversion dimers by pairs of weak C—H⋯O hydrogen bonds. In addition, π–π [centroid–centroid distance = 3.7279 (16) Å] and weak C—H⋯π inter­actions are observed.
doi:10.1107/S1600536812033491
PMCID: PMC3414174  PMID: 22904781
10.  {4,4′,6,6′-Tetra­iodo-2,2′-[propane-1,3-diylbis(nitrilo­methanylyl­idene)]diphenolato-κ4 O,N,N′,O′}nickel(II) 
The asymmetric unit of the title compound, [Ni(C17H12I4N2O2)], comprises half of a Schiff base complex. The NiII and central C atom of the propyl chain are located on a twofold rotation axis. The geometry around the NiII atom is square planar, supported by the N2O2 donor atoms of the coordinated ligand. In the crystal, there are no significant inter­molecular inter­actions present. The crystal studied was a non-merohedral twin with a refined twin component ratio of 0.944 (1):0.056 (1).
doi:10.1107/S1600536812032138
PMCID: PMC3414144  PMID: 22904751
11.  2-[(Z)-(3-{[(Z)-2-Hy­droxy-3,5-diiodo­benzyl­idene]amino}­propyl­imino)­meth­yl]-4,6-diiodo­phenol 
In the title compound, C17H14I4N2O2, there are two intra­molecular O—H⋯N hydrogen bonds, which make S(6) ring motifs. In the crystal, there are no significant inter­molecular inter­actions present.
doi:10.1107/S160053681203214X
PMCID: PMC3414953  PMID: 22904940
12.  4,4′,6,6′-Tetra­bromo-2,2′-[(E,E)-ethane-1,2-diylbis(nitrilo­methanylyl­idene)]di­phenol 
The asymmetric unit of the title compound, C16H12Br4N2O2, comprises half of a potential tetra­dentate Schiff base ligand. The whole mol­ecule is generated by an inversion center located in the middle of the C—C bond of the ethyl­ene segment. There are intra­molecular O—H⋯N hydrogen bonds making S(6) ring motifs. In the crystal, no significant inter­molecular inter­actions are observed.
doi:10.1107/S1600536812029832
PMCID: PMC3414283  PMID: 22904816
13.  (E)-4-Amino-N′-(2-hy­droxy-5-meth­oxy­benzyl­idene)benzohydrazide monohydrate 
In the title compound, C15H15N3O3·H2O, the hydazide Schiff base mol­ecule shows an E conformation around the C=N bond. An intra­molecular O—H⋯N hydrogen bond makes an S(6) ring motif. The dihedral angle between the substituted phenyl rings is 23.40 (11)°. The water mol­ecule mediates linking of neighbouring mol­ecules through O—H⋯(O,O) hydrogen bonds into infinite chains along the a axis, which are further connected together through N—H⋯O hydrogen bonds, forming a two-dimensional network parallel to (001). C—H⋯O inter­actions aso occur.
doi:10.1107/S1600536812026633
PMCID: PMC3414187  PMID: 22904794
14.  4,4′,6,6′-Tetra­chloro-2,2′-[(1E,1′E)-propane-1,3-diylbis(nitrilo­methanylyl­idene)]diphenol 
The title compound, C17H14Cl4N2O2, is generated by crystallographic twofold symmetry. The two benzene rings are inclined to one another by 80.17 (10)°. There are two intra­molecular O—H⋯N hydrogen bonds, which make S(6) ring motifs. In the crystal, mol­ecules are linked by C—H⋯O and weak C—H⋯Cl inter­actions, forming a three-dimensional network.
doi:10.1107/S1600536812029443
PMCID: PMC3414188  PMID: 22904795
15.  4,6-Dichloro-2-[(E)-(2-{[(E)-3,5-dichloro-2-oxidobenzyl­idene]aza­nium­yl}eth­yl)iminiumylmeth­yl]phenolate 
The asymmetric unit of the title compound, C16H12Cl4N2O2, comprises half of a potentially tetra­dentate Schiff base ligand, located about a twofold rotation axis which bis­ects the central C—C bond of the ethane-1,2-diamine group. In the solid state, the compound exists in the zwitterionic form. There are two intra­molecular N—H⋯O hydrogen bonds making S(6) ring motifs. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds, forming two-dimensional frameworks which lie parallel to (100). There are also short Cl⋯Cl [3.4395 (9) Å] contacts present.
doi:10.1107/S160053681202870X
PMCID: PMC3394033  PMID: 22798898
16.  4,6-Dichloro-2-((E)-{4-[(E)-3,5-dichloro-2-hy­droxy­benzyl­idene­amino]­butyl­imino}­meth­yl)phenol 
The asymmetric unit of the title compound, C18H16Cl4N2O2, comprises half of a potentially tetra­dentate Schiff base ligand. It is located about a twofold rotation axis that bis­ects the central C—C bond of the butane-1,4-diamine group. There are two intra­molecular O—H⋯N hydrogen bonds making S(6) ring motifs. In the crystal, mol­ecules are linked by pairs of weak C—H⋯Cl inter­actions, forming inversion dimers, which are further connected by C—H⋯O hydrogen bonds into two-dimensional frameworks that lie parallel to (001).
doi:10.1107/S1600536812028693
PMCID: PMC3394034  PMID: 22798899
17.  4,6-Dibromo-2-[(E)-(4-{[(E)-3,5-dibromo-2-hy­droxy­benzyl­idene]amino}­butyl)­imino­meth­yl]phenol 
The asymmetric unit of the title compound, C18H16Br4N2O2, comprises half the molecule, which is located adjacent to an inversion centre at the mid-point of the central C—C bond of the butane-1,4-diamine segment. There are two intra­molecular O—H⋯N hydrogen bonds making S(6) ring motifs. In the crystal, mol­ecules are linked by pairs of weak C—H⋯Br inter­actions into chains along [101], which include R 2 2(8) ring motifs. These chains are further linked by C—H⋯O hydrogen bonds, forming a three-dimensional network.
doi:10.1107/S1600536812028863
PMCID: PMC3394053  PMID: 22798918
18.  Bis(dimethyl­formamide-κO){4,4′,6,6′-tetra­chloro-2,2-[butane-1,4-di­yl(nitrilo­methanylyl­idene)]diphenolato-κ4 O,N,N′,O′}nickel(II) 
In the title Schiff base complex, [Ni(C18H14Cl4N2O2)(C3H7NO)2], the geometry around the NiII atom is distorted octa­hedral. It is coordinated by the N2O2 donor atoms of the tetra­dentate Schiff base ligand and the O atoms of two dimethyl­formamide mol­ecules, which are cis to one another. The benzene rings are almost normal to each other [dihedral angle = 88.60 (14)°]. The various intra­molecular C—H⋯O hydrogen bonds make S(5) and S(6) ring motifs. In the crystal, mol­ecules are linked by pairs of weak C—H⋯Cl inter­actions, forming inversion dimers.
doi:10.1107/S1600536812028681
PMCID: PMC3393240  PMID: 22807808
19.  catena-Poly[{μ3-4,4′,6,6′-tetra­chloro-2,2′-[butane-1,4-diylbis(nitrilo­methanyl­yl­idene)]diphenolato}{μ2-4,4′,6,6′-tetra­chloro-2,2′-[butane-1,4-diylbis(nitrilo­methanylyl­idene)]diphenolato}dicopper(II)] 
The asymmetric unit of the title compound, [Cu2(C18H14Cl4N2O2)2]n, contains two independent CuII ions which are bridged by a pair of 4,4′,6,6′-tetra­chloro-2,2′-[butane-1,4-diylbis(nitrilo­methanylyl­idene)]diphenolate ligands, forming a dinuclear unit. One of the CuII ions is coordinated in a distorted square-planar environment and the other is coordinated in a distorted square-pyramidal environment. The long apical Cu—O bond of the square-pyramidal coordinated CuII ion is formed by a symmetry-related O atom, creating a one-dimensional polymer along [010]. In addition, short inter­molecular Cl⋯Cl distances [3.444 (2) Å] and weak π–π inter­actions [centroid–centroid distances = 3.736 (2)–3.875 (3) Å] are observed. The crystal studied was an inversion twin with a refined twin component ratio of 0.60 (1):0.40 (1).
doi:10.1107/S1600536812028462
PMCID: PMC3393241  PMID: 22807809
20.  catena-Poly[{μ3-4,4′,6,6′-tetra­bromo-2,2′-[butane-1,4-diylbis(nitrilo­methan­ylyl­idene)]diphenolato}{μ2-4,4′,6,6′-tetra­bromo-2,2′-[butane-1,4-diylbis(nitrilo­methanylyl­idene)]dipheno­lato}dicopper(II)] 
The asymmetric unit of the title coordination polymer consists of a dinuclear neutral complex mol­ecule of formula [Cu2(C18H14Br4N2O2)2]n. One of the CuII ions is coordinated in a distorted square-planar geometry, whereas the other is coordinated in a distorted square-pyramidal geometry, the long apical Cu—O bond [2.885 (4) Å] of the square-pyramidal coordination being provided by a symmetry-related O atom creating a one-dimensional polymer along [010]. π–π stacking inter­actions [centroid–centroid distance = 3.783 (4) Å] and short inter­chain Br⋯Br inter­actions [3.6142 (12)–3.6797 (12) Å] are observed.
doi:10.1107/S1600536812029285
PMCID: PMC3393252  PMID: 22807712
21.  (E)-4-Amino-N′-(2-hy­droxy-5-methyl­benzyl­idene)benzohydrazide 
The asymmetric unit of the title compound, C15H15N3O2, comprises two crystallographically independent mol­ecules (A and B), each having an E conformation around the C=N bond. In each mol­ecule, there is an intra­molecular O—H⋯N hydrogen bond making an S(6) ring motif. The dihedral angles between the substituted phenyl rings are 17.49 (9) and 10.03 (9)°. In the crystal, N—H⋯O hydrogen bonds link neighbouring independent mol­ecules into infinite chains, of the type –A–B–A–B–, along the a axis, enclosing R 2 1(7) ring motifs. The chains are linked by N—H⋯O hydrogen bonds and C—H⋯O inter­actions, leading to the formation of a three-dimensional network.
doi:10.1107/S1600536812027948
PMCID: PMC3393987  PMID: 22798852
22.  4-Amino-2-hy­droxy­benzohydrazide 
The asymmetric unit of the title compound, C7H9N3O2, comprises two crystallographically independent mol­ecules (A and B). In each mol­ecule there is an intra­molecular O—H⋯O hydrogen bond making an S(6) ring motif. In the crystal, a pair of N—H⋯N hydrogen bonds link the two mol­ecules (A and B) into a dimer with an R 2 2(6) ring motif. The B mol­ecules are linked via pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R 2 2(10) ring motif. The mol­ecules are further linked via other N—H⋯O hydrogen bonds, forming undulating two-dimensional networks lying parallel to the bc plane. These networks are finally linked via N—H⋯O hydrogen bonds, forming a three-dimensional structure.
doi:10.1107/S1600536812026190
PMCID: PMC3393929  PMID: 22798794
23.  (E)-4-Amino-N′-(5-chloro-2-hy­droxy­benzyl­idene)benzohydrazide 
In the title hydrazide Schiff base compound, C14H12ClN3O2, the conformation around the C=N double bond is E. The dihedral angle between the benzene rings is 41.57 (14) Å. An intra­molecular O—H⋯N hydrogen bond makes an S(6) ring motif. In the crystal, mol­ecules are linked by N—H⋯O (bifurcated acceptor) and N—H⋯N hydrogen bonds, forming chains along the a axis. The inter­esting feature of the crystal structure is the short inter­molecular C⋯O [3.216 (3), 3.170 (3), and 2.992 (3) Å] contacts, one of which is significantly shorter than the sum of the van der Waals radii of these atoms [3.22 Å].
doi:10.1107/S1600536812025974
PMCID: PMC3393930  PMID: 22798795
24.  (E)-4-Amino-N′-(5-bromo-2-hy­droxy­benzyl­idene)benzohydrazide mono­hydrate 
In t the title compound, C14H12BrN3O2. H2O, the conformation of the C=N double bond in the hydrazide Schiff base mol­ecule is E. The dihedral angle between the benzene rings is 48.01 (11) °. An intra­molecular O—H⋯N hydrogen bond makes an S(6) ring motif. In the crystal, mol­ecules are linked through N—H⋯O (bifurcated acceptor) and O—H⋯O hydrogen bonds, forming two-dimensional networks lying parallel to (100).
doi:10.1107/S1600536812025950
PMCID: PMC3393931  PMID: 22798796
25.  {4,4′,6,6′-Tetra­iodo-2,2′-[(2,2-dimethyl­propane-1,3-di­yl)bis­(nitrilo­methanylyl­idene)]diphenolato}nickel(II) 
The asymmetric unit of the title compound, [Ni(C19H16I4N2O2)], comprises half of a Schiff base complex. The NiII atom is located on a twofold rotation axis which also bis­ects the central C atom of the 2,2-dimethyl­propane group of the ligand. The geometry around the NiII atom is distorted square-planar, with a dihedral angle of 21.7 (3)° between the symmetry-related N/Ni/O coordination planes. The dihedral angle between the symmetry-related benzene rings is 27.9 (3)°. In the crystal, short inter­molecular I⋯I [3.8178 (9) and 3.9013 (10) Å] inter­actions are present.
doi:10.1107/S1600536812024944
PMCID: PMC3393197  PMID: 22807765

Results 1-25 (186)