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In the title mol­ecule, C13H19NO4, except for two C atoms of the tert-butyl group, the non-H atoms are almost coplanar (r.m.s. deviation = 0.2542 Å). In the crystal, mol­ecules are linked into centrosymmetric dimers by two inter­molecular N—H⋯O hydrogen bonds, forming an R 2 2(10) ring motif.

In the title compound, C11H15NOS, the 3-(dimethyl­amino)­prop-2-en-1-one unit is approximately planar [maximum deviation = 0.0975 (14) Å] and its mean plane of seven non-H atoms makes a dihedral angle of 6.96 (10)° with the thio­phene ring. In the crystal, mol­ecules are linked by pairs of C—H⋯O hydrogen bonds into inversion dimers with R 2 2(14) ring motifs. The dimers are stacked along the c axis through C—H⋯π inter­actions. The two methyl groups, attached to the thio­phene ring and the amino N atom, are each disordered over two orientations, with site-occupancy ratios of 0.59 (4):0.41 (4) and 0.74 (4):0.26 (4), respectively.

In the title pyrimidine derivative, C24H28N2O3, the uracil unit is essentially planar with an r.m.s. deviation of 0.0054 (1) Å for the eight non-H atoms. The pyrimidine ring is tilted by a dihedral angle of 77.08 (7)° with respect to the aromatic ring of the 3,5-dimethyl­benzyl substituent, whereas it is nearly parallel to the benzene ring of the pheneth­oxy­methyl unit, with a dihedral angle of 8.17 (8)°. An intra­molecular C—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, mol­ecules are linked by a pair of amide–uracil N—H⋯O hydrogen bonds into an inversion R 2 2(8) dimer. These dimers are stacked along the b axis through π–π inter­actions with a centroid–centroid distance of 3.9517 (8) Å. Weak C—H⋯π inter­actions are also present.

In the title compound [systematic name: (tert-butyl­dimethyl­silyl)methane­triyl tris­(4-methyl­benzene­sulfonate)], C32H44O10S3Si, the central C atom and the SiIV center are in a tetra­hedral configuration. The inter­planar angles between pairs of the three benzene rings of the 4-methyl­phenyl­sulfonyl units are 41.15 (10), 18.11 (10) and 44.09 (10)°. C—H⋯π inter­actions are observed in the crystal structure. Mol­ecules are linked into screw chains along the b axis by weak C—H⋯O inter­actions. Weak intramolecular C—H⋯O hydrogen bonds are also present.

The title compound, C11H12O3, is essentially planar, with an r.m.s. deviation of 0.179 Å from the mean plane through the 14 non-H atoms in the mol­ecule. The benzene ring and the pyranone mean plane are inclined at 13.12 (6)° to one another and the pyran­one ring adopts a flattened chair conformation. In the crystal, O—H⋯O hydrogen bonds and C—H⋯O contacts form R 1 2(6) rings and link mol­ecules into chains along b. Additional C—H⋯O contacts generate inversion dimers, with R 2 2(8) ring motifs, and form sheets parallel to (-102) which are linked by C—H⋯π interactions.

In the title compound, C15H17N3O, the dihedral angle between the benzene rings is 58.05 (9)°. The non-H atoms of the hydrazide group lie in a common plane (r.m.s. deviation = 0.0006 Å) and are close to coplanar with their attached benzene ring [dihedral angle = 8.02 (9)°]. An intra­molecular N—H⋯O hydrogen bond generates an S(6) ring motif in the mol­ecule, and a short intra­molecular contact (H⋯H = 1.88 Å) is also observed. In the crystal, mol­ecules are linked by pairs of N—H⋯N hydrogen bonds into inversion dimers. The crystal packing also features C—H⋯π inter­actions.

In the title coumarin derivative, C13H12O4, the 2H-chromene ring system is essentially planar [maximum deviation = 0.047 (1) Å]. An intra­molecular hydrogen bond is observed between the hy­droxy and the ketonic O atoms. In the crystal, pairs of inter­molecular C—H⋯O hydrogen bonds link inversion-related mol­ecules into dimers. Additional inter­molecular C—H⋯O hydrogen bonds further inter­connect these dimers into two-dimensional arrays incorporating R 2 2(9) ring motifs.

The asymmetric unit of the title compound, C16H14O4, consists of one half-mol­ecule of an essentially planar biphenyl­dicarboxylic acid ester, with the complete molecule generated by an inversion centre. The maximum deviation from a least-squares plane through all non-H atoms occurs for the peripheric methyl groups and amounts to 0.124 (2) Å. The solid represents a typical mol­ecular crystal without classical hydrogen bonds. The shortest inter­molecular contacts do not differ significantly from the sum of the van der Waals radii of the atoms involved.

In the title mol­ecule, C19H17F3N2O2, the fused cyclo­hexene and pyran rings adopt sofa and flattened boat conformations, respectively. The four essentially planar atoms of the pyran ring [maximum deviation = 0.008 (2) Å] form a dihedral angle of 88.13 (9)° with the benzene ring. The F atoms of the trifluoro­methyl group were refined as disordered over three sets of sites in a 0.507 (7):0.330 (7):0.163 (3) ratio. In the crystal, mol­ecules are connected into inversion dimers via pairs of N—H⋯N hydrogen bonds and these dimers are further linked by N—H⋯O hydrogen bonds into a two-dimensional network parallel to (100).

In the title compound, C18H13BrN4S·C3H7NO, the thio­pyran ring and the adjacent six-numbered ring adopt distorted boat conformations. The mol­ecules, lying about inversion centers, form hydrogen-bonded dimers involving one of the H atoms on the amino group with the N atom of a cyano group of an adjacent mol­ecule, resulting in a 12-membered ring system [R 2 2(12) ring motif]. The other H atom of the amino group forms an inter­molecular hydrogen bond with the O atom of the dimethyl­formamide (DMF) mol­ecule. Another lone pair of electrons on the same carbonyl O atom of DMF mol­ecule forms a non-classical C—H⋯O inter­molecular hydrogen bond, resulting in a chain of mol­ecules.

In the title compound, C10H10N2O2, all non-H atoms are approximately co-planar with an r.m.s. deviation of 0.016 Å. In the crystal, mol­ecules are linked into inversion dimers by pairs of N—H⋯O hydrogen bonds. Chains along [010] are buiilt up by π–π inter­actions [centroid–centroid distance = 3.602 (1) Å] between the benzene and piperazine rings of adjacent mol­ecules.

In the title compound, C18H17N3O, the dihedral angle between the phenyl and benzene rings is 11.22 (14)°. Apart from the methyl H atoms, the mol­ecule is close to planar, with a maximum deviation of 0.145 (3) Å. Intra­molecular C—H⋯O and C—H⋯N inter­actions occur. In the crystal, inversion dimers linked by pairs of N—H⋯N hydrogen bonds occur, resulting in an R 2 2(12) ring motif. Further C—H⋯N and C—H⋯O bonds generate R 1 2(7) and R 2 2(22) motifs and a C—H⋯π inter­action also occurs.

There are two independent mol­ecules in the asymmetric unit of the title compound, C14H14N2O4S. The N—H bonds are syn to the ortho-nitro groups in the sulfonyl benzene rings and anti to the methyl groups in the aniline benzene rings. The mol­ecules are twisted at the S—N bonds with torsion angles of −60.4 (3) and 58.8 (3)° in the two mol­ecules. The dihedral angles between the planes of the sulfonyl and the anilino benzene rings are 53.67 (8) and 56.99 (9)°. The amide H atoms of both mol­ecules are involved in an intra­molecular hydrogen bond, generating an S(7) motif. In the crystal, pairs of N—H⋯O(S) hydrogen bonds link like mol­ecules into inversion dimers.

The pyrimidine ring of the title compound, C25H30N2O3, is approximately planar (r.m.s. deviation = 0.003 Å); the C atom at the 5-position deviates by 0.012 (3) Å from the mean plane and the C atom at the 6-position by 0.038 (3) Å. In the mol­ecule, the pyrimidine ring is oriented at 86.72 (9) and 59.75 (9)° with respect to the two benzene rings, and the two benzene rings are inclined to each other at 58.35 (9)°. In the crystal, the amino group is hydrogen-bond donor to the exocyclic O atom at the 4-position of an adjacent mol­ecule, the hydrogen bond generating an inversion dimer.

In the title compound, C10H12N6·C2H5OH, the planarity of the heterocyclic system is slightly distorted at the triazine ring (r.m.s. deviation = 0.1191 Å), which adopts a conformation best described as inter­mediate between a flattened twisted boat and a half-boat with the tertiary Csp 3 atom at the bow. In the crystal, mol­ecules form centrosymmetric dimers connected by N⋯H—O and O⋯H—N hydrogen bonds between the amino group H atom, the ethanol solvent mol­ecule and the triazine N atom, making an R 4 4(12) graph-set motif. The other H atom of the amino group and the H atom on the endocyclic N atom form N⋯H—N hydrogen bonds with the N atoms of the pyrazole and pyridine rings, respectively, linking the mol­ecules into C(7)C(7) chains with the R 2 2(8) binary graph-set motif running along [010].

In the title compound, C4H7N3O·C2H6OS, creatinine [2-amino-1-methyl-1H-imidazol-4(5H)one] exists in the amine form. The ring is planar (r.m.s. deviation for all non-H atoms = 0.017 Å). In the crystal, two creatinine mol­ecules form centrosymmetric hydrogen-bonded dimers linked by pairs of N—H⋯N hydrogen bonds. In addition, creatinine is linked to a dimethyl sulfoxide mol­ecule by an N—H⋯O inter­action. The packing shows layers parallel to (120).

The base mol­ecule of the title co-crystal, C7H10N2O2S·C7H6O3, is essentially planar, with a maximum deviation of 0.0806 (14) Å for all non-H atoms. The acid mol­ecule is also nearly planar, with a dihedral angle of 8.12 (14)° between the benzene ring and the carb­oxy group. In the crystal, the acid mol­ecules form an inversion dimer through a pair of O—H⋯O hydrogen bonds with an R 2 2(8) ring motif. The pyrimidine mol­ecules are linked on both sides of the dimer into a heterotetra­mer via O—H⋯N and C—H⋯O hydrogen bonds with R 2 2(8) ring motifs. The heterotetra­mers are further linked by weak C—H⋯O hydrogen bonds, forming a tape structure along [1-10].

The title compound, C16H15Cl2N3O2·CH3OH, a Schiff base molecule, is prepared by the reaction of 3,5-dichloro­salicyl­aldehyde with 4-dimethyl­amino­benzohydrazide in methanol. The Schiff base mol­ecule is approximately planar, with a mean deviation from the least-squares plane defined by the non-H atoms of 0.0452 (3) Å, and with a dihedral angle between the benzene rings of 4.2 (3)°. This planarity is assisted by the formation of an intra­molecular O—H⋯N hydrogen bond. In the crystal, adjacent Schiff base mol­ecules are linked by two methanol mol­ecules through N—H⋯O and O—H⋯O hydrogen bonds, forming dimers.

The title compound, C26H28O3Si, is an allylic oxidation product of the tert-but­yl(2,2-dimethyl-2,3-dihydro­benzo­furan-7-yl­oxy)diphenyl­silane with N-bromo­succinimide and 2,2′-azobis-isobutyronitrile. The nine-atom bicyclic system is almost planar, with an r.m.s deviation of 0.0123 (2) Å and a maximum deviation of 0.031 (2) Å for the O atom. In the crystal, the mol­ecules pile up along the b axis but the strongest inter­molecular contacts are the π–π stacking inter­actions between the benzene rings along the c axis [centroid–centroid distance = 3.655 (3) Å].

In the title compound, C16H25NO, the N-tert-butyl­propanamide fragment is essentially planar, with the exception of two C atoms of the tert-butyl group (r.m.s. deviation = 0.005 Å), forming a dihedral angle of 84.09 (10)° with the plane of the mesityl fragment (r.m.s. deviation = 0.002 Å). The crystal packing is stabilized by an inter­molecular N—H⋯O hydrogen bond, which links the mol­ecules into chains with graph-set notation C(4) running parallel to the c axis.

In the title isoquinoline­dione compound, C16H16N2O3S, the piperidine ring in the tetra­hydro­isoquinoline ring system adopts a half-boat conformation. The essentially planar thia­zole ring [maximum deviation = 0.007 (2) Å] makes a dihedral angle of 34.49 (7)° with the mean plane through the tetra­hydro­isoquinoline ring system. In the crystal structure, two neighbouring mol­ecules are linked via pairs of O—H⋯N and C—H⋯O hydrogen bonds into inversion-related dimers incorporating R 2 2(9) hydrogen-bond ring motifs. These dimers are further linked by weak inter­molecular C—H⋯π inter­actions.

In the title compound, C21H24N4O2, inversion-related mol­ecules are linked into dimers through pairs of N—H⋯O hydrogen bonds, which generate R 2 2(8) motifs. As well as dimer formation, an additional N—H⋯O hydrogen bond and two C—H⋯π contacts, involving H atoms from the phenyl ring and the pyrrole and benzene rings of the indole system, generate a three-dimensional network.

The asymmetric unit of the title compound, C47H58N6O6, comprises three independent mol­ecules, in one of which one tert-butyl group is disordered in a 1:1 ratio. The mol­ecule is a di(ar­yl)methane having two aliphatic and one N-heterocyclic substituent in each aryl ring. For the mol­ecule having the disordered tert-butyl group, the aryl rings make an angle of 115.3 (2)° at the methyl­ene carbon; one aryl ring is aligned at 42.0 (1)° with respect to the N-heterocyclic substituent and the other at 48.7 (1)° with respect to its substituent. The two ordered mol­ecules are disposed about a pseudo center of inversion. The pairs of twist angles in these two mol­ecules differ [52.7 (1) and 61.7 (1)°, and 29.1 (1) and 58.5 (1)°].

The asymmetric unit of the title compound, [Mo(C19H16Cl4N2O2)O2], comprises two independent mol­ecules (A and B). The geometry around the MoVI atom is distorted octa­hedral in each complex mol­ecule, supported by two oxide O atoms and the N2O2 donor atoms of the coordinating ligand. The dihedral angle between the benzene rings is 74.96 (11) Å for mol­ecule A and 76.05 (11) Å for mol­ecule B. In the crystal, the B mol­ecules are linked by pairs of C—H⋯Cl hydrogen bonds, forming inversion dimers. The crystal structure is further stabilized by C—H⋯π inter­actions. An inter­esting feature of the crystal structure is a Cl⋯Cl contact [3.3748 (18) Å], which is shorter than the sum of the van der Waals radii of Cl atoms (3.50 Å).

In the title compound, C17H17ClO4, the dihedral angle between the mean planes of the two benzene rings is 65.92 (5)°. The methyl ester group lies within the ring plane [deviations of O atoms from the plane = −0.051 (2) and 0.151 (2) Å] due to an intra­molecular O—H⋯O hydrogen bond. In the crystal, mol­ecules are held together by rather weak non-classical inter­molecular C—H⋯O hydrogen bonds, resulting in dimeric units about inversion centers, forming eight- and ten-membered ring systems as R 2 2(8) and R 2 2(10) motifs.