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The triclinic structure of the title compound, cyclo-tetra­kis­(μ-1,1-dioxo-1λ6,2-benzothia­zole-3-thiol­ato-κ2S:S)tetra­kis­[(triphenyl­phosphane-κP)silver(I)], [Ag4(C7H4NO2S2)4(C18H15P)4], is a polymorph of the previously reported monoclinic structure [Dennehy, Mandolesi, Quinzani & Jennings (2007). Z. Anorg. Allg. Chem. 633, 2746–2752]. In both polymorphs, the complex lies on a crystallographic inversion centre and the bond distances are closely comparable. Some differences can be found in the inter­atomic angles and torsion angles involving the inner Ag4S4 skeleton. The polymorphs contain essentially identical two-dimensional layers, but with different layer stacking arrangements. In the triclinic form, all layers are related by lattice translation, while in the monoclinic form they are arranged around glide planes so that adjacent layers are mirrored with respect to each other.

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The asymmetric unit of the title compound, {[La(C4H5O2)3(H2O)2]·C5H5N5·H2O}n, consists of an LaIII cation, three crotonate (but-2-enoate) anions and two coordinated water mol­ecules forming the neutral complex, completed by an external adenine mol­ecule and one hydration water mol­ecule. The LaO10 coordination polyhedra, connected through the sharing of a single edge, form isolated chains running along the [100] direction. These one-dimensional structures are characterized by two different centrosymmetric La2O2 loops, with La...La distances of 4.5394 (6) and 4.5036 (6) Å. The unbound adenine and water solvent mol­ecules form a highly planar hydrogen-bonded array parallel to (110) (r.m.s. deviation from the mean plane < 0.10 Å) which inter­sects the isolated La–crotonate chains in a slanted fashion to form an extremely connected hydrogen-bonded three-dimensional structure.

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The asymmetric unit of the title dimeric compounds, [Ln2(C4H5O2)6(H2O)4]·C5H5N5·7H2O, with Ln = Dy, (I), and Sm, (II), consists of an LnIII cation, three crotonate (but-2-enoate) anions and two coordinated water mol­ecules forming the neutral complex, cocrystallized with half of an external adenine mol­ecule and 3.5 water mol­ecules. The metal complex has crystallographic inversion symmetry. The LnO9 coordination polyhedra are connected through the sharing of a single edge to form isolated dimeric units, with Ln...Ln separations of 4.1766 (12) Å for (I) and 4.2340 (12) Å for (II). The unbound adenine mol­ecule and one of the solvent water mol­ecules are disordered around an inversion centre into two overlapping, equally populated, units. The structure is sustained by a complex hydrogen-bonding scheme involving all possible O-H and N-H groups as donors, and crotonate and water O and adenine N atoms as acceptors. The system is compared with recently published related compounds.

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Although it has not proved possible to crystallize the newly prepared cyclam-methyl­imidazole ligand 1-[(1-methyl-1H-imidazol-2-yl)methyl]-1,4,8,11-tetra­aza­cyclo­tetra­decane (LIm1), the trans and cis isomers of an NiII complex, namely trans-aqua­{1-[(1-methyl-1H-imidazol-2-yl)methyl]-1,4,8,11-tetra­aza­cyclo­tetra­decane}nickel(II) bis­(perchlorate) mono­hydrate, [Ni(C15H30N6)(H2O)](ClO4)2·H2O, (1), and cis-aqua­{1-[(1-methyl-1H-imidazol-2-yl)methyl]-1,4,8,11-tetraaza­cyclo­tetra­decane}nickel(II) bis­(perchlorate), [Ni(C15H30N6)(H2O)](ClO4)2, (2), have been prepared and structurally characterized. At different stages of the crystallization and thermal treatment from which (1) and (2) were obtained, a further two compounds were isolated in crystalline form and their structures also analysed, namely trans-{1-[(1-methyl-1H-imidazol-2-yl)methyl]-1,4,8,11-tetra­aza­cyclo­tetra­decane}(perchlorato)nickel(II) perchlorate, [Ni(ClO4)(C15H30N6)]ClO4, (3), and cis-{1,8-bis­[(1-methyl-1H-imidazol-2-yl)methyl]-1,4,8,11-tetra­aza­cyclo­tetra­decane}nickel(II) bis­(perchlorate) 0.24-hy­drate, [Ni(C20H36N6)](ClO4)2·0.24H2O, (4); the 1,8-bis­[(1-methyl-1H-imidazol-2-yl)methyl]-1,4,8,11-tetra­azacyclo­tetra­decane ligand is a minor side product, probably formed in trace amounts in the synthesis of LIm1. The configurations of the cyclam macrocycles in the complexes have been analysed and the structures are compared with analogues from the literature.

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The crystal structure of aripiprazole nitrate (systematic name: 4-(2,3-dichloro­phen­yl)-1-{4-[(2-oxo-1,2,3,4-tetra­hydro­quino­lin-7-yl)­oxy]but­yl}piperazin-1-ium nitrate), C23H28Cl2N3O2+·NO3- or AripH+·NO3-, is presented and the mol­ecule com­pared with the aripiprazole molecules reported so far in the literature. Bond distances and angles appear very similar, except for a slight lengthening of the C-NH distances involving the protonated N atom, and the main differences are to be found in the mol­ecular spatial arrangement (revealed by the sequence of torsion angles) and the inter­molecular inter­actions (resulting from structural elements specific to this structure, viz. the nitrate counter-ions on one hand and the extra protons on the other hand as hydrogen-bond acceptors and donors, respectively). The result is the formation of [100] strips, laterally linked by weak [pi]-[pi] and C-Cl...[pi] inter­actions, leading to a family of undulating sheets parallel to (010).

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The title ionic compound, (C7H8N3)2[Ho2(C4H5O2)8], is con­structed from two almost identical independent centrosymmetric anionic dimers balanced by two independent 2-amino-1H-benzimid­azol-3-ium (Habim+) cations. The asymmetric part of each dimer is made up of one HoIII cation and four crotonate (crot or but-2-enoate) anions, two of them acting in a simple η2-chelating mode and the remaining two acting in two different μ22 fashions, viz. purely bridging and bridging–chelating. Symmetry-related HoIII cations are linked by two Ho—O—Ho and two Ho—O—C—O—Ho bridges which lead to rather short intra­cationic Ho...Ho distances [3.8418 (3) and 3.8246 (3) Å]. In addition to the obvious Coulombic inter­actions linking the cations and anions, the isolated [Ho2(crot)8]2− and Habim+ ions are linked by a number of N—H...O hydrogen bonds, in which all N—H groups of the cation are involved as donors and all (simple chelating) crot O atoms are involved as acceptors. These inter­actions result in compact two-dimensional structures parallel to (110), which are linked to each other by weaker π–π contacts between Habim+ benzene groups.

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The mol­ecular structure of aripiprazole perchlorate (systematic name: 4-(2,3-dichloro­phenyl)-1-{4-[(2-oxo-1,2,3,4-tetra­hydro­quinolin-7-yl)­oxy]­butyl}­piperazin-1-ium perchlor­ate), C23H28Cl2N3O2+·ClO4-, does not differ substantially from the recently published structure of aripiprazole nitrate [Freire, Polla & Baggio (2012). Acta Cryst. C68, o170-o173]. Both compounds have almost identical bond distances, bond angles and torsion angles. The two different counter-ions occupy equivalent places in the two structures, giving rise to very similar first-order `packing motifs'. However, these elemental arrangements inter­act with each other in different ways in the two structures, leading to two-dimensional arrays with quite different organizations.

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The Zn complexes bis­(acetyl­acetonato-κ2O,O′)bis­{4′-[4-(methyl­sulfan­yl)phen­yl]-4,2′:6′,4′′-terpyridine-κN1}zinc(II), [Zn(C5H7O2)2(C22H17N3S)2], (I), and {μ-4′-[4-(methyl­sulfan­yl)phen­yl]-4,2′:6′,4′′-terpyridine-κ2N1:N1′′}bis­[bis­(acetyl­acetonato-κ2O,O′)zinc(II)], [Zn2(C5H7O2)4(C22H17N3S)], (II), are discrete entities with different nuclearities. Compound (I) consists of two centrosymmetrically related monodentate 4′-[4-(methyl­sul­fan­­yl)phen­yl]-4,2′:6′,4′′-terpyridine (L1) ligands binding to one ZnII atom sitting on an inversion centre and two centro­symmetrically related chelating acetyl­acetonate (acac) groups which bind via carbonyl O-atom donors, giving an N2O4 octa­hedral environment for ZnII. Compound (II), however, consists of a bis-monodentate L1 ligand bridging two ZnII atoms from two different Zn(acac)2 fragments. Intra- and inter­molecular inter­actions are weak, mainly of the C—H...π and π–π types, mediating similar layered structures. In contrast to related structures in the literature, sulfur-mediated nonbonding inter­actions in (II) do not seem to have any significant influence on the supra­molecular structure.

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The title compound, C9H8N2, presents two almost identical independent mol­ecules in the asymmetric unit, both of them exhibiting an extremely planar isoquinoline core (maximum r.m.s. deviation = 0.014 Å). The most significant deviation is found in the -NH2 groups, which present a noticeable pyramidalization around the N atom, a feature also present in related structures containing the mol­ecule as a ligand. The supra­molecular structure is based on pairs of parallel hydrogen-bonded chains formed by just one mol­ecular type each, defined by the strongest hydrogen bonds in the structure, which are of the N-H...N type. These parallel chains are linked into pairs (or strips) via weaker C-H...N hydrogen bonds. Related strips generated by the c-glide plane define two families running along [\overline{1}10] and [110], giving rise to an inter­esting system of inter­woven chains stabilized by a number of weaker contacts of the C-H...[pi] type.

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The title compound, C21H21NO7S3, consists of an SO2ON(SO2)2 central fragment and three terminal 4-methyl­phenyl groups each attached at a sulfonyl S atom. The most obvious characteristic is the presence of two nearly face-to-face benzene rings, with their centroids separated by a rather short distance [3.7808 (18) Å], but with a rather slanted relative orientation [dihedral angle = 20.63 (13)°] so as to preclude a strong intra­molecular π–π inter­action. The third benzene ring is nearly perpendicular to the other two [dihedral angles = 71.62 (14) and 70.4 (13)°]. The packing of the structure is directed by two C—H...O hydrogen bonds involving aromatic H atoms (methyl H atoms are strictly non-inter­acting), which define chains running in the [100] direction. These one-dimensional chains evolve parallel to each other and exhibit no significant lateral inter­actions.
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