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In the mononuclear complex title salt, all of the non-H atoms of the cation lie on a mirror plane, as do the N and one O atom of the nitrate anion, such that the planes of the cation and anion are mutually orthogonal. In the crystal, layers parallel to (010) are generated by N—H...O hydrogen bonds, supported by short S...O [3.196 (4) and 3.038 (3) Å] and S...S contacts [3.4392 (13) Å].

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{[Fe(H2O)2{Ag(CN)2}2](2,2′-bpe)2}n forms a two-dimensional grid-type structure with the organic guest mol­ecules occupying the space between adjacent grid layers. The grid layers are held together by hydrogen bonds between the organic guest mol­ecules and the host framework and gives rise to a three-dimensional supra­molecular architecture.

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The asymmetric unit of the title compound, [Co2(NCS)4(C10H8N2)3(C2H6OS)2]n, consists of one CoII atom, two thio­cyanate anions, one dimethyl sulfoxide mol­ecule and one and a half 4,4′-bi­pyridine mol­ecules. The half-molecule is completed by inversion symmetry. The CoII atom is coordin­ated in a distorted octa­hedral geometry by two N atoms from two thio­cyanate anions, one O atom from dimethyl sulfoxide as a terminal ligand and three N atoms from three 4,4′-bi­pyridine mol­ecules as bridging ligands linking the cations, with a Co...Co separation of 11.5964 (5) Å. This generates a two-dimensional structure parallel to (-103). A C—H...S hydrogen bond links the layers into a three-dimensional supra­molecular framework. The layers are stacked in an ABC fashion preventing the occurrence of inter­layer void space and hence leading to the absence of lattice solvent and/or organic guest mol­ecules in the structure.

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In the title salt, [Ag(C7H8N2S)(C18H15P)2]NO3, the coordination geometry about the AgI atom is shallow trigonal pyramidal, with the metal atom displaced by 0.372 (1) Å from the plane of the P and S atoms. In the crystal, the cations are linked to the anions by N—H...O hydrogen bonds, generating tetra­mers (two cations and two anions), which feature R22(8) and R44(8) loops. The cations are linked by weak C—H...π inter­actions, generating a three-dimensional network.
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