(2-Chloro­benzo[h]quinolin-3-yl)methanol

In the title mol­ecule, C14H10ClNO, all non-H atoms are coplanar (r.m.s deviation = 0.0266 Å). In the crystal, symmetry-related mol­ecules are hydrogen bonded via inter­molecular O—H⋯O inter­actions, forming chains along the b axis

Recent advances in starch–clay nanocomposites

Biological nanocomposites are a valuable addition to the existing nanocomposite materials and eventually can substitute petroleum-based composite materials in numerous applications due to their inherent advantages such as biodegradability, eco-friendliness, low cost, and easy availability to name a few. Recently, polymer–clay nanocomposites have achieved much more attention due to their enhanced properties such as size dispersion and significant enhancement in physicochemical and mechanical properties in comparison to the pure polymer systems. Among various biopolymers, starch is one of the most abundant natural polymers on the earth and is highly valuable due to its chemical and physical properties. Starch polymer has highly increased potential as an alternative to petroleum-based materials. However, starch cannot be used alone and starch–clay nanocomposite has emerged as a new potential green sustainable material. This article focuses on recent progress in starch-based nanocomposites with particular emphasis on starch–clay nanocomposite preparation, properties, and applications

3-[(2-Chloro-6-methyl­quinolin-3-yl)meth­yl]quinazolin-4(3H)-one

In the title mol­ecule, C19H14ClN3O, the quinoline and quinazoline ring systems form a dihedral angle of 80.75 (4)°. In the crystal, the mol­ecules are linked by pairs of C—H⋯N hydrogen bonds into centrosymmetric dimers, generating R 2 2(6) ring motifs. The structure is further stabilized by C—H⋯π inter­actions and π–π stacking inter­actions [centroid–centroid distances = 3.7869 (8) and 3.8490 (8) Å]

(2-Chloro-8-methyl­quinolin-3-yl)methanol

The mol­ecule of title compound, C11H10ClNO, is close to being planar (r.m.s deviation for the non-H atoms = 0.017 Å). In the crystal, mol­ecules inter­act by way of O—H⋯O hydrogen bonds, generating C(2) chains propagating in [010]. The crystal structure is consolidated by C—H⋯π inter­actions and aromatic π–π stacking inter­actions [centroid–centroid distance = 3.661 (2) Å]

1-[(2-Chloro-8-methyl­quinolin-3-yl)­meth­yl]pyridin-2(1H)-one

In the title compound, C16H13ClN2O, the quinoline ring system is approximately planar [maximum deviation 0.021 (2) Å] and forms a dihedral angle of 85.93 (6)° with the pyridone ring. Inter­molecular C—H⋯O hydrogen bonding, together with weak C—H⋯π and π–π inter­actions [centroid-to-centroid distances 3.5533 (9) and 3.7793 (9) Å], characterize the crystal structure

Ethyl 6-chloro-2-[(2-chloro-7,8-dimethyl­quinolin-3-yl)meth­oxy]-4-phenyl­quinoline-3-carboxyl­ate

In the title compound, C30H24Cl2N2O3, the two quinoline ring systems are almost planar [maximum deviations = 0.029 (2) and 0.018 (3) Å] and the dihedral angle between them is 4.17 (8)°. The dihedral angle between the phenyl ring and its attached quinoline ring is 69.06 (13)°. The packing is stabilized by C—H⋯O, C—H⋯N, weak π–π stacking [centroid–centroid distances = 3.7985 (16) and 3.7662 (17) Å] and C—H⋯π inter­actions

(2-Chloro-6-methyl­quinolin-3-yl)methanol

The title compound, C11H10ClNO, is close to being planar (r.m.s deviation for the non-H atoms = 0.026 Å). In the crystal, mol­ecules are linked by O—H⋯O hydrogen bonds, generating C(2) chains, and weak C—H⋯π inter­actions and aromatic π–π stacking inter­actions [centroid–centroid distance = 3.713 (3) Å] help to consolidate the structure

1-[(2-Chloro-7-methyl-3-quinol­yl)meth­yl]pyridin-2(1H)-one

In the title compound, C16H13ClN2O, the quinoline ring system is essentially planar, with a maximum deviation of 0.021 (2) Å. The pyridone ring is oriented at a dihedral angle of 85.93 (6)° with respect to the quinoline ring system. In the crystal structure, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules along the b axis. Weak π–π stacking inter­actions [centroid–centroid distances = 3.7218 (9) and 3.6083 (9) Å] are also observed

N-[2-(4-Methyl-2-quinol­yl)phen­yl]acetamide: a P1 structure with Z = 4

The title compound, C18H16N2O, crystallizes in the triclinic space group P1, with four independent mol­ecules in the asymmetric unit wherein two mol­ecules have an irregular -ac, -ac, +ap conformation (ap, antiperiplanar; ac, anticlinal), while the other mol­ecules exhibit a different, +ac, +ac, +ap conformation. The planar (r.m.s. deviation = 0.006 Å in each of the four molecules) quinoline ring systems of the four mol­ecules are oriented at dihedral angles of 32.8 (2), 33.4 (2), 31.7 (2) and 32.3 (2)° with respect to the benzene rings. Intra­molecular N—H⋯N inter­actions occur in all four independent mol­ecules. The crystal packing is stabilized by inter­molecular N—H⋯O and C—H⋯O hydrogen bonds, and are further consolidated by C—H⋯π and π–π stacking inter­actions [centroid–centroid distances = 3.728 (3), 3.722 (3), 3.758 (3) and 3.705 (3) Å]

3-tert-Butyl-1H-isochromene-1-thione

The title compound, C13H14OS, crystallizes with two independent mol­ecules in the asymmetric unit. The unit cell contains three voids of 197 Å3, but the residual electron density (highest peak = 0.24 e Å−3 and deepest hole = −0.18 e Å−3) in the difference Fourier map suggests no solvent mol­ecule occupies this void. The crystal structure is stabilized by π–π inter­actions between the isocoumarin ring systems, with centroid–centroid distances of 3.6793 (14) and 3.6566 (15) Å