Four solvent-responsive one-dimensional copper(I) coordination polymers (CPs), namely, {[Cu 4 I 4 L(MeCN) 2 ]·CH 2 Cl 2 } n (1), {[Cu 4 I 4 L(MeCN) 2 ]·CHCl 3 } n (2), {[Cu 4 I 4 L(MeCN) 2 ]·0.5p-xylene} n (3), and [Cu 4 I 4 L(MeCN) 2 ] n (4), were prepared by reaction of CuI with N,N′-bis[2-(cyclohexylthio)ethyl]pyromellitic diimide (L) via self-assembly under varying solvent conditions. CPs 1−4, which are pseudopolymorphic supramolecular isomers derived from solvent molecules, are composed of Cu 4 I 4 cubane clusters. The ligands in CPs 1−3 adopted a synconformation, whereas in CP 4 they were observed in the anticonformation. This occurred via syn to anti transitions upon heating, followed by exposure to MeCN vapor. In addition, a reversible anti to syn transition was achieved by agitating in mixed organic solvents. It was shown that ligand transition from the syn-to the anti-conformation occurred through crystal-to-amorphous-to-crystal transformations. Furthermore, CPs 1−3 exhibited reversible solvent exchange and crystal transformation by exposure to vapors from volatile organic compounds.C oordination polymers (CPs) have recently received a great amount of attention, with studies focusing on the control of geometric structures of compounds formed by coordination between well-designed ligands and metal cations. Furthermore, the production of compounds exhibiting useful functionalities has also been investigated. CPs have the potential for use in various fields, such as catalysis, 1−3 ion exchange, 4,5 selective adsorption, 6−8 hydrogen storage, 9,10 sensors, 11,12 and magnetism-based applications. 13,14 Moreover, a number of studies are currently underway regarding the crystal transformation of CPs by control of anionic, solvent, ligand, and metal cationic molar ratios. Predicting such structural changes is not easy; hence, many chemists have invested effort in identifying and controlling the influences of the factors that induce structural changes. Our aim was to focus on reversible/nonreversible structural transformations in copper(I) CPs by variation of temperature and solvent. Furthermore, we wished to investigate their emission changes under the above conditions. We expect that a number of structural transformations will be related to conformational changes of the sulfur-containing organic ligands and the labile Cu−S coordination bond. 15−17 We investigated the preparation of four CPs by reaction of CuI with a dithioether ligand bearing a pyromellitic diimide spacer. We found that by varying the ligand to metal ratio, complexes with different structures were formed, including rhomboid dimers and stair-step polymers. Although acetonitrile and dichloromethane were used as solvents and structural transformations were induced by controlling the ligand/metal ratio, some reversible crystal transformations were also observed. 15 We later reported the preparation of four CPs containing Cu 2 I 2 clusters by reaction of CuI with a ligand bearing both pyrazine and sulfur moieties. In addition, we reported a contr...

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In the title compound, C10H6Cl2N2 (systematic name: 4,6-di­chloro-2-phenyl­pyrimidine), which is used commercially as the herbicide safener, fenclorim, the dihedral angle between the di­chloro­pyrimidyl and phenyl rings is 9.45 (10)°. In the crystal, C—H⋯N hydrogen bonds link adjacent mol­ecules, forming chains along the c-axis direction. In addition, weak inter­molecular C—Cl⋯π [3.6185 (10) Å] and π–π [3.8796 (11) Å] inter­actions are present, forming a three-dimensional network.

In the title compound {systematic name: 4-phenoxyphenyl (RS)-2-[(pyridin-2-yl)oxy]propyl ether}, C 20 H 19 NO 3 , which is a juvenile hormone mimic and insecticide, the dihedral angles between the plane of the central benene ring and those of the pendant pyridine ring and phenyl ring are 78.09 (6) and 82.14 (8) , respectively. The conformation of the O-C-C-O linkage is gauche [torsion angle = À75.0 (2) ]. In the crystal, weak aromatic -stacking interactions [centroid-centroid separation = 3.8436 (13) Å ] and C-HÁ Á Á interactions link adjacent molecules, forming a three-dimensional network.Keywords: crystal structure; pyriproxyfen; ether; juvenile hormone mimic; insecticide; -stacking.

The title compound, C21H11ClF6N2O3 (systematic name: 1-{4-[2-chloro-4-(trifluoromethyl)phenoxy]-2-fluorophenyl}-3-(2,6-di­fluoro­benzo­yl)urea), is a benzoyl­urea pesticide. The dihedral angles between the central fluoro­benzene ring and the terminal di­fluoro­phenyl ring and chloro­phenyl ring system are 62.15 (5) and 88.03 (5)°, respectively. In the crystal, N—H⋯O hydrogen bonds link adjacent mol­ecules, forming R 2 2(8) inversion dimers that pack into loop chains along the a-axis direction by short F⋯F contacts [2.729 (2) Å]. In addition, the chains are linked by weak C—H⋯π and π–π inter­actions [inter-centroid distances = 3.661 (2) and 3.535 (12) Å], resulting in a three-dimensional architecture.