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N,N'-Bis(6-methyl-2-pyrid-yl)oxamide.

ABSTRACT: In the crystal structure of the title compound, C(14)H(14)N(4)O(2), the mol-ecules are almost planar (mean deviation 0.028 Å) and a weak intra-molecular N-H⋯O hydrogen bond between the H atom bound to an oxamide N atom and a carbonyl O atom is found. The asymmetric unit consits of one half-mol-ecule which is located on a centre of inversion.

SUBMITTER: Cheng PC

PROVIDER: S-EPMC2971095 | biostudies-literature |

REPOSITORIES: biostudies-literature

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A triclinic polymorph with Z = 3 of N,N'-bis-(2-pyrid-yl)oxamide.

Project description:The asymmetric unit of the title compound, C(12)H(10)N(4)O(2), contains three half-mol-ecules. Each half-mol-ecule is completed by crystallographic inversion symmetry. The title compound, (I), is a polymorph of the structure, (II), reported by Hsu & Chen [Eur. J. Inorg. Chem. (2004), 1488-1493]. In the original report, the compound crystallized in the tetra-gonal space group P[Formula: see text]2(1)c (Z = 8), whereas the structure reported here is triclinic (P[Formula: see text], Z = 3). In both forms, each oxamide mol-ecule is almost planar (with maximum deviations are 0.266 and 0.166?Å) and the O atoms are trans oriented. The principal difference between the two forms lies in the different hydrogen-bonding patterns. In (I), two N-H?O and one N-H?N hydrogen bonds link the mol-ecules, forming a two-dimensional network, whereas in (II) there are no classical hydrogen bonds to O atoms and only weak C-H?O inter-actions are found along with rings of N-H?N bonds.

| S-EPMC3099752 | biostudies-literature

1,3-Bis[(6-methyl-2-pyrid-yl)meth-yl]imidazolium bromide.

Project description:The title compound, C(17)H(19)N(4) (+)·Br(-), is built up from 1,3-bis-[(6-methyl-2-pyridin-yl)meth-yl]imidazolium cations and bromide anions. Each of two 6-methyl-2-pyridyl rings is rotated out of the imidazole plane, making dihedral angles of 79.90?(9) and 86.40?(9)°. The packing is consolidated by aromatic ?-? inter-actions between the pyridine rings of neighbouring mol-ecules [centroid-centroid distance = 3.554?(2)?Å] and by weak C-H?N and C-H?Br hydrogen bonds.

| S-EPMC2968481 | biostudies-literature

Crystal structure of N,N'-bis-(4-methyl-phen-yl)di-thio-oxamide.

Project description:Two half mol-ecules of the title compound, C16H16N2S2, are present in the asymmetric unit and both mol-ecules are completed by crystallographic inversion centers at the mid-points of the central C-C bonds: the lengths of these bonds [1.538?(5) and 1.533?(5)?Å] indicate negligible electronic delocalization. The trans-di-thio-oxamide fragment in each mol-ecule is characterized by a pair of intra-molecular N-H?S hydrogen bonds. In the crystal, mol-ecules are linked by weak C-H..? inter-actions, generating a three-dimensional network.

| S-EPMC4384591 | biostudies-literature

[Oxalylbis(aza-nedi-yl)]bis-{[amino-(2-pyrid-yl)methyl-ene]ammonium}.

Project description:The title compound, C(14)H(16)N(8)O(2) (2+)·2ClO(4) (-), was prepared by reaction of bis-[amino-(2-pyrid-yl)methyl-ene]oxalohydrazide with perchloric acid. The mol-ecular symmetry is C(i) and thus the asymmetric unit comprises one half-mol-ecule. The dihedral angle between the aromatic ring and the plane of the oxamide group is 70.8 (3)°. The perchlorate anions and the cations are connected by inter-molecular N-H⋯O hydrogen bonds.

| S-EPMC2969094 | biostudies-literature

N,N'-Bis(pyridin-3-yl)oxamide.

Project description:The title mol-ecule, C12H10N4O2, located about an inversion centre, is roughly planar, with an r.m.s. deviation from the least-squares plane of all non-H atoms of 0.019?Å. In the crystal, N-H?N hydrogen bonds between the amide N-H group and the pyridine N atom connect the mol-ecules into a corrugated layer parallel to (10-1).

| S-EPMC3629611 | biostudies-literature

Bis(3-meth-oxy-6-methyl-2-pyrid-yl) ether.

Project description:In the mol-ecule of the title compound, C(14)H(16)N(2)O(3), the dihedral angle between the pyridyl rings is 87.74?(3)°. In the crystal structure, inter-molecular C-H?O hydrogen bonds link the mol-ecules into infinite zigzag chains.

| S-EPMC2960406 | biostudies-literature

Bis{2-meth-oxy-6-[(3-pyrid-yl)methyl-imino-meth-yl]phenolato}copper(II).

Project description:In the mononuclear title complex, [Cu(C(14)H(13)N(2)O(2))(2)], the Cu(II) atom lies on an inversion centre and adopts a square-planar coordination geometry. The dihedral angle formed by the pyridine and benzene rings is 74.61?(5)°. Intra-molecular C-H?O hydrogen bonds are present. The crystal structure is stabilized by weak aromatic ?-? stacking inter-actions involving neighbouring pyridine rings [centroid-centroid distance = 3.853?(2)?Å].

| S-EPMC2970154 | biostudies-literature

3,4-Bis(2-pyrid-yl)-5-(3-pyrid-yl)-4H-1,2,4-triazole.

Project description:In the title mol-ecule, C(17)H(12)N(6), the 2-pyridyl rings in the 3- and 4-positions and the 3-pyridyl ring in the 5-position make dihedral angles of 29.78?(16), 67.06?(16) and 32.97?(16)°, respectively, with the triazole group. The dihedral angle between the two 2-pyridyl rings is 65.72?(15)°. The dihedral angles between the 3-pyridyl ring and the two 2-pyridyl rings in the 3- and 4-positions are 61.28?(15) and 63.11?(15)°, respectively. In the crystal, C-H?? and ?-? inter-actions [centroid-centroid distance = 3.6248?(19)?Å] link the mol-ecules, forming a two-dimensional network.

| S-EPMC3089253 | biostudies-literature

Di-?-perchlorato-bis-{?-2-[(2-pyrid-yl)methyl-amino-meth-yl]phenolato)dicopper(II) acetonitrile disolvate.

Project description:In the crystal of the dinuclear title compound, [Cu(2)(C(13)H(13)N(2)O)(2)(ClO(4))(2)]·2CH(3)CN, the two bridging perchlorate ions chelate to the two Cu(II) atoms in a ?-O:O' fashion on opposite sides of the equatorial plane. The Cu(II) ions display a distorted octa-hedral coordination geometry (in the usual 4 + 2 Jahn-Teller arrangement), each being coordinated by two O atoms from the two perchlorate ligands, and two N and O atoms from the reduced Schiff base ligand. The asymmetric unit contains two acetonitrile solvent mol-ecules. In the crystal structure, in addition to N-H?O hydrogen bonds, there are weak C-H?O inter-actions between the perchlorate O atoms and the reduced Schiff base ligand. C-H?N inter-actions are also present.

| S-EPMC2977449 | biostudies-literature

4-Amino-3-methyl-benzoic acid-1,2-bis-(4-pyrid-yl)ethane (1/1).

Project description:In the crystal structure of the title 1:1 adduct, C(12)H(12)N(2)·C(8)H(9)NO(2), the 4-amino-3-methyl-benzoic acid mol-ecules and 1,2-bis-(4-pyrid-yl)ethane mol-ecules are linked by inter-molecular O-H?N, N-H?O and N-H?N hydrogen bonds, forming a two-dimensional supra-molecular network parallel to (001). In the 1,2-bis-(4-pyrid-yl)ethane mol-ecule, the two pyridine rings are twisted to each other by a dihedral angle of 12.12?(8)°. The non-H atoms of the 4-amino-3-methyl-benzoic acid mol-ecule are almost coplanar, the maximum atomic deviation being 0.029?(1)?Å. Weak C-H?? inter-actions are present in the crystal structure.

| S-EPMC3052056 | biostudies-literature

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