2-[(5-Chloro-2-oxidobenzyl­idene)aza­nium­yl]-2-methyl­propane-1,3-diol

The title compound, C₁₁H₁₄ClNO₃, was prepared by the condensation of equimolar quanti­ties of 5-chloro­salicyl­aldehyde and 2-amino-2-methyl­propane-1,3-diol in methanol. In the crystal, it exists in the zwitterionic form, with nominal proton transfer from the phenol group to the imine N atom. This results in the formation of an intra­molecular N—H...O hydrogen bond, which generates an S(6) ring. Inter­molecular O—H...O hydrogen bonds arise from the hy­droxy groups, forming (001) sheets.

N′-(2-Hy­droxy-4-meth­oxy­benzyl­idene)-4-methyl­benzohydrazide

The asymmetric unit of the title compound, C₁₆H₁₆N₂O₃, contains four independent mol­ecules with different conformations; the dihedral angles between the two benzene rings in the mol­ecules are 39.7 (3), 45.4 (3), 50.6 (3) and 51.6 (3)°. Intramolecular O—H...N hydrogen bonds are observed in the molecule. In the crystal, N—H...O hydrogen bonds link the mol­ecules into two crystallographically independent chains propagating in [010], and each chain is formed by two alternating independent mol­ecules. Weak C—H...O inter­actions also occur.

Chlorido[N,N′-dibenzyl-N,N′-bis­(pyridin-2-ylmeth­yl)ethane-1,2-diamine]­copper(II) perchlorate methanol monosolvate

In the title solvated mol­ecular salt, [CuCl(C₂₈H₃₀N₄)]ClO₄·CH₃OH, the Cu²⁺ ion is coordinated by the N,N′,N′′,N′′′-tetra­dentate ligand and a chloride ion, generating a very distorted square-based pyramidal CuN₄Cl coordination geometry with the Cl⁻ ion in the basal position. In the crystal, the solvent mol­ecules and anions are linked by weak O—H...O hydrogen bonding.

[2-({Benz­yl[2-(benz­yl{5-methyl-2-oxido-3-[(pyridin-2-ylmeth­yl)imino­meth­yl]benz­yl}amino)­eth­yl]aza­nium­yl}meth­yl)-4-methyl-6-[(pyridin-2-ylmeth­yl)imino­meth­yl]phenolato]nickel(II) perchlorate methanol disolvate

In the solvated title complex, [Ni(C₄₆H₄₇N₆O₂)]ClO₄·2CH₄O, the coordination sphere around the Ni^II ion can be described as distorted cis-NiO₂N₄ octa­hedral defined by two phenolate O atoms and four N atoms from the hexa­dentate ligand. An intra­molecular bifurcated N—H...(N,O) hydrogen bond helps to establish the conformation of the complex mol­ecule. In the crystal, the components are connected by O—H...O and C—H...O hydrogen bonds.

Bis[μ-bis­(diphenyl­phosphan­yl)methane-κ²P:P′]bis­[(isoquinoline-κN)silver(I)] bis­(trifluoro­methane­sulfonate)–isoquinoline (1/1)

The title complex, [Ag₂(C₂₅H₂₂P₂)₂(C₉H₇N)₂](CF₃SO₃)₂·C₉H₇N, was prepared by the reaction of silver(I) trifluoro­methane­sulfonate with isoquinoline and bis­(diphenyl­phosphan­yl)methane (dppm). The dinuclear mol­ecule is located about a center of inversion and the Ag^I atom is coordinated by two dppm P atoms and one isoquinoline N atom, forming an eight-membered metalla ring. In addition, in the asymmetric unit, there is a half-mol­ecule of isoquinoline located about a center of inversion. Since this mol­ecule does not possess this symmetry, for one position in the ring there is superposition of both a C atom of a C—H group and the isoquinoline N atom. In the structure, the Ag—P distances [2.4296 (9) and 2.4368 (9) Å] agree with the corresponding distances in related structures, while the Ag—N bond length [2.489 (3) Å] is slightly longer than that in related structures. On the other hand, the P—Ag—P angle [156.44 (3)°] is much larger than the corresponding angles in related structures. The trifluoro­methane­sulfonate anions do not coordinate to Ag^I atoms. As is usually found for these anions, the –CF₃ group is disordered over two orientations [occupancies = 0.57 (12) and 0.43 (12)].

1,3-Dimethyl-1H-indazol-6-amine

The mol­ecular skeleton of the title compound, C₉H₁₁N₃, is almost planar, with a maximum deviation of 0.0325 (19) Å for the amino N atom. In the crystal, N—H...N hydrogen bonds establish the packing.

7-{4-[(1,3-Benzodioxol-5-yl)meth­yl]piperazin-1-yl}-1-cyclo­propyl-6-fluoro-4-oxo-1,4-dihydro­quinoline-3-carb­oxy­lic acid

In the title structure, C₂₅H₂₄FN₃O₅, a strong intra­molecular O—H...O hydrogen bond is present between the carb­oxy group at the 3-position and the carbonyl group at the 4-position. In the crystal, mol­ecules are held together by weak C—H...O, C—H...F and π–π [centroid–centroid distance 3.6080 (8) Å] inter­actions. The 1,4-dihydro­quinoline ring and cyclo­propyl group are not in the same plane, making an inter­planar angle of 57.52 (8)°.

Pseudoaglycone of Spinosyn A

The title compound [systematic name: 9-ethyl-13-hy­droxy-14-methyl-2-(3,4,5-trimeth­oxy-6-methyl­tetra­hydro-2H-pyran-2-yl­oxy)-3,3a,5b,6,9,10,11,12,13,14,16a,16b-dodeca­hydro-1H-as-indaceno[3,2-d][1]oxacyclo­dodecine-7,15(2H,5aH)-dione], C₃₃H₅₀O₉, was obtained by hydrolysis of Spinosyn A. The fused cyclo­pentene ring adopts a twisted conformation, while the fused cyclo­hexene and cyclo­pentane rings are in envelope conformations with the same C atom at the flaps. In the crystal, mol­ecules are linked by O—H...O and C—H...O hydrogen bonds into a layer parallel to the ab plane.

7′-Amino-1′H-spiro­[cyclo­heptane-1,2′-pyrimido[4,5-d]pyrimidin]-4′(3′H)-one

The title compound, C₁₂H₁₇N₅O, was obtained by cyclo­condensation of 2,4-diamino­pyrimidine-5-carbonitrile with cyclo­hepta­none. The tetra­hydro­pyrimidine ring has a dis­torted boat conformation and the cyclo­heptane ring adopts a chair conformation. In the crystal, molecules are linked via N—H...O and N—H...N hydrogen bonds generating a three-dimensional network.

4,4′-Bipyridine-1,1′-diium bis­(1,3-benzo­thia­zole-2-thiol­ate)

In the title salt, C₁₀H₁₀N₂²⁺·2C₇H₄NS₂⁻, the complete 4,4′-bipyridine-1,1′-diium dication is generated by a center of symmetry. In the crystal, N—H...N hydrogen bonds are observed between the cations and anions.