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In the structure of the title complex, [Cs(C6H2Cl3N2O2)(H2O)]n, the caesium salt of the commercial herbicide picloram, the Cs+ cation lies on a crystallographic mirror plane, which also contains the coordinating water mol­ecule and all non-H atoms of the 4-amino-3,5,6-trichloro­picolinate anion except the carboxyl­ate O-atom donors. The irregular CsCl4O5 coordination polyhedron comprises chlorine donors from the ortho-related ring substituents of the picloramate ligand in a bidentate chelate mode, with a third chlorine bridging [Cs—Cl range 3.6052 (11)–3.7151 (11) Å] as well as a bidentate chelate carboxyl­ate group giving sheets extending parallel to (010). A three-dimensional coordination polymer structure is generated through the carboxyl­ate group, which also bridges the sheets down [010]. Within the structure, there are intra-unit water O—H...Ocarboxyl­ate and amine N—H...Npyridine hydrogen-bonding inter­actions.

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In the title salt, C12H11N2O2+·C7H5O6S, the dihedral angle between the benzene and pyridine rings in the 4-(4-nitro­benz­yl)pyridinium cation is 82.7 (2)°. Within the anion there is an intramolecular hydroxy-O—H...O(carboxylic acid) bond. In the crystal, the cation forms a single N+—H...Osulfonate hydrogen bond with the anion. These cation–anion pairs inter­act through duplex anion carb­oxy­lic acid O—H...Osulfonate hydrogen bonds, giving a centrosymmetric cyclic association [graph set R22(16)]. The crystals studied were non-merohedrally twinned.

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In the structure of the title compound, [Mg(C7H3N2O6)2(H2O)4]·4H2O, the slightly distorted octa­hedral MgO6 coord­in­ation polyhedron comprises two trans-related carboxyl­ate O-atom donors from mononodentate 3,5-dinitro­benzoate ligands, and four water mol­ecules. The coordinating water mol­ecules and the four water mol­ecules of solvation give both intra- and inter-unit O—H...O hydrogen-bonding inter­actions with carboxyl­ate, water and nitro O-atom acceptors, forming a three-dimensional structure.

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In the asymmetric unit of the title co-crystal, C12H14N4O2S·C7H5NO4, the sulfamethazine and 2-nitro­benzoic acid mol­ecules form a heterodimer through inter­molecular amide–carb­oxy­lic acid N—H...O and carb­oxy­lic acid–pyrimidine O—H...N hydrogen-bond pairs, giving a cyclic motif [graph set R22(8)]. The dihedral angle between the two aromatic ring systems in the sulfamethazine mol­ecule is 88.96 (18)° and the nitro group of the acid is 50% rotationally disordered. Secondary aniline N—H...Osulfone hydrogen-bonding associations give a two-dimensional structure lying parallel to the ab plane.

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In the monomeric title complex, [Co(C6H8O4)(C10H9N3)(H2O)2]·3H2O, the distorted octa­hedral CoN2O4 coordination environment comprises two N-atom donors from the bidentate di­pyridyldi­amine ligand, two O-atom donors from one of the carboxyl­ate groups of the bidentate chelating adipate ligand and two water mol­ecules. In addition, there are three solvent water mol­ecules which are involved in both intra- and inter-unit O—H...O hydrogen-bonding inter­actions, which together with an amine–water N—H...O hydrogen bond produce a three-dimensional framework.

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In the structure of the phenolate salt of the sulfa drug sulfamethazine with 3,5-dinitro­salicylic acid, C12H15N4O2S+·C7H3N2O7, the dihedral angle between the pyrimidine and benzene rings of the cation is 59.70 (17)°. In the crystal, cation–anion hydrogen-bonding inter­actions involving pyrim­idine–carb­oxy N+—H...O and amine–carb­oxy N—H...O pairs give a cyclic R22(8) motif while secondary N—H...O hydrogen bonds between the aniline group and both sulfone and nitro O-atom acceptors give a two-dimensional structure extending in (001).

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In the structure of the title complex, [Cs(C8H4Cl3O2)(H2O)]n, the caesium salt of the commercial herbicide fenac [(2,3,6-tri­chloro­phen­yl)acetic acid], the irregular eight-coordination about Cs+ comprises a bidentate O:Cl-chelate inter­action involving a carboxyl­ate-O atom and an ortho-related ring-substituted Cl atom, which is also bridging, a triple-bridging carboxyl­ate-O atom and a bridging water mol­ecule. A two-dimensional polymer is generated, lying parallel to (100), within which there are water–carboxyl­ate O—H...O hy­dro­gen-bonding inter­actions.

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In the structure of the title complex, [Cs(C7H4NO2)(H2O)2]n, the caesium salt of 4-nitro­benzoic acid, the irregular CsO9 coordination sphere comprises three bridging nitro O-atom donors, a bidentate carboxyl­ate O,O′-chelate inter­action, a triple-bridging water mol­ecule and a monodentate water mol­ecule. A three-dimensional framework polymer is generated, within which there are water–carboxyl­ate O—H...O and water–water O—H...O hydrogen-bonding inter­actions.

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In the title squaraine dye solvate, C26H24N2O2·2CHCl3, the dye mol­ecule is essentially planar, except for the methyl groups, having a maximum deviation over the 26-membered delocalized bond system of 0.060 (2) Å. It possesses crystallographic twofold rotational symmetry with the indole ring systems adopting a syn conformation. The mol­ecular structure features intra­molecular N—H...O hydrogen bonds enclosing conjoint S7 ring motifs about one of the dioxo­cyclo­butene O atoms, while the two chloro­form solvent mol­ecules are linked to the second O atom through C—H...O hydrogen bonds.

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In the title salt C7H10NO+·C8H3Cl2O4 the benzene rings of the cation and anion are essentially parallel [inter-ring dihedral angle 4.8 (2)°]. In the anion the carb­oxy­lic acid and carboxyl­ate groups make dihedral angles of 19.0 (2) and 79.5 (2)°, respectively, with the benzene ring. Aminium N—H...O, carb­oxy­lic acid O—H...O and weak aromatic C—H...O hydrogen-bonding associations with carboxyl O-atom acceptors together with cation–anion π–π ring inter­actions [minimum ring centroid separation = 3.734 (3) Å] give rise to a sheet structure lying parallel to (001).
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