The controlled self-assembly of CuI and an asymmetric ligand with mixed N/S donors, 2-(tert-butylthio)-N-(pyridin-3-yl)acetamide (L), afforded three Cu(I) coordination polymers (CPs), [Cu4I4L2(MeCN)2]n (1), [Cu4I4L2]n (2), and {[Cu4I4L2]⋅MeOH}n (3). X-ray analyses showed that CPs 1-3 are supramolecular isomers with 1, 2, and 3D structures, respectively. CP 1 adopts a stairstep Cu4I4 cluster, whereas CPs 2 and 3 are composed of cubane-like Cu4I4 clusters. Crystal-to-crystal transformations of 1 to 2 and 3 showed reversible transformations between different Cu4I4 clusters using heat or solvent (acetonitrile or methanol) vapor. CP 2 was reversibly transformed to 3 by the addition of methanol and heat. Therefore, the transformations between supramolecular isomers 1, 2, and 3 are completely reversible.

Four copper(I) coordination polymers (CPs), {[CuIL]·CH3CN]} n (1), {[CuIL]·CHCl3} n (2), {[CuIL]·CH2Cl2} n (3), and [CuIL] n (4), were prepared by self-assembly reactions between CuI and (2-pyrazinylcarbonyl)thiomorpholine (L). CPs 1–4 are interconnected by rhomboid Cu–I2–Cu units. CPs 1 and 4 have one-dimensional loop-chain structures, and 2 and 3 adopt two-dimensional network structures. CPs 1–4 are pseudopolymorphic supramolecular isomers. CPs 2′ and 3′ are prepared by removal of solvate molecules from CPs 2 and 3, which are polymorphic supramolecular isomers with CP 4. Reversible crystal-to-crystal transformations were observed under appropriate conditions such as solvent or heat.

In the title compound, the herbicide bifenox, C14H9Cl2NO5, the dihedral angle between the dichlorobenzene and nitro­benzene rings is 78.79 (14)°. In the crystal, C—H⋯O hydrogen bonds give rise to a three-dimensional network structure in which there are both a π–π inter­action [ring centroid separation = 3.6212 (16) Å] and a C—Cl⋯π inter­action [Cl⋯ring centroid = 3.4754 (8) Å]. In addition, short Cl⋯Cl contacts [3.3767 (11) and 3.3946 (11) Å] are present.

The title compound, C23H32N2OS, is a thio­urea-based insecticide. The dihedral angle between the phenyl ring and the diisopropyl benzene ring plane is 73.18 (6)°, while that between the plane of the thio­urea group and the diisopropyl benzene ring is 86.00 (5)°. Disorder was modelled for the S atom and the two methyl C atoms of the isopropyl group over two sets of sites with an occupancy ratio of 0.742 (4):0.258 (4). In the crystal, N—H⋯S hydrogen bonds link adjacent mol­ecules, forming R 2 2(8) inversion dimers that pack into chains along the b-axis direction.

In the title compound {systematic name: 2-[(3,5,6-trichloropyridin-2-yl)oxy]acetic acid}, the herbicide triclopyr, C 7 H 4 Cl 3 NO 3 , the asymmetric unit comprises two independent molecules in which the dihedral angles between the mean plane of the carboxylic acid group and the pyridyl ring plane are 79.3 (6) and 83.8 (5) . In the crystal, pairs of intermolecular O-HÁ Á ÁO hydrogen bonds form dimers through an R 2 2 (8) ring motif and are extended into chains along [100] by weak -interactions [ring centroid separations = 3.799 (4) and 3.810 (4) Å ]. In addition, short intermolecular ClÁ Á ÁCl contacts [3.458 (2) Å ] connect the chains, yielding a twodimensional architecture extending parallel to (020). The crystal studied was found to be non-merohedrally twinned with the minor component being 0.175 (4).Keywords: crystal structure; herbicide; triclopyr; hydrogen-bonded dimers; -interactions; non-merohedral twinning.CCDC reference: 1015180 Related literature