Bis­[tris­(ethyl­enedi­amine)­cobalt(III)] di­chloro­bis­[μ‐(1‐hydroxy­ethyl­idene)­di­phospho­nato(4–)]­di­ruthenium(II,­III)­(Ru–Ru) chloride trihydrate

In the title compound, [Co(C₂H₈N₂)₃]₂[Ru₂(C₂H₄O₇P₂)₂Cl₂]Cl·3H₂O, the building unit contains two crystallographically independent dinuclear [Ru₂(hedp)₂Cl₂]⁵⁻ anions, where hedp [viz. (1‐hydroxy­ethyl­idene)­di­phospho­nate] serves as a bis‐chelating bridging ligand, two types of [Co(en)₃]³⁺ cations, one uncoordinated Cl⁻ anion and five water mol­ecules of crystallization. The [Ru₂(hedp)₂Cl₂]⁵⁻ anions are connected to one another, forming one‐dimensional chains along the a axis. The [Co(en)₃]³⁺ cations are located between these chains and lie across inversion centres. An extensive series of hydrogen bonds lead to the formation of a three‐dimensional supramol­ecular network structure, with channels generated along the [100] direction. The uncoordinated water mol­ecules and Cl⁻ anions reside in these channels.     

trans‐Chloro­bis­(ethyl­enedi­amine‐N,N′)­nitro­cobalt(III) perchlorate

In the title compound, trans‐[CoCl(NO₂)(C₂H₈N₂)₂]ClO₄, there are two independent Co^III complexes with a distorted octahedral coordination, and they show an orientational disorder such that the positions of the nitro and chloro ligands are exchanged. As a result, the averaged structure has inversion centres at the Co atoms. The perchlorate‐O atoms are disordered over two sites.     

Tris­(ethyl­enedi­amine‐N,N′)cobalt(III) oxalate perchlorate dihydrate

The crystallization behavior of the title compound, [Co(C₂H₈N₂)₃](C₂O₄)(ClO₄)·2H₂O, has been studied in order to evaluate the effect of the counter‐anion on the crystalline structures of [Co(en)₃](C₂O₄)·X (en = ethyl­enedi­amine). Two‐dimensional intermolecular hydrogen‐bonding networks are formed between the amine protons of the [Co(en)₃]³⁺ cations and the O atoms of the oxalate anions. Perchlorate and water mol­ecules fill in the channels between the two‐dimensional networks and form hydrogen‐bonding interactions with the two‐dimensional layers, thus constructing a three‐dimensional hydrogen‐bonding network.     

trans‐Chloro­bis­(ethyl­enedi­amine‐N,N′)­nitro­cobalt(III) nitrate

In the title compound, trans‐[CoCl(NO₂)(C₂H₈N₂)₂]NO₃, a distorted octahedral Co^III complex shows an orientational disorder such that the positions of the nitro and chloro ligands are exchanged. The occupation factors of the major and minor orientations are 84 and 16%, respectively. The O atoms of the nitrate ion are disordered over two sites.     

Polymeric μ‐cyano‐di­cyano­nickelate(II)‐μ‐cyano‐trans‐bis­[N‐(2‐hydroxyethyl)ethyl­enedi­amine]­cadmium(II)

The title compound, catena‐poly­[[μ‐cyano‐1:2κ²C:N‐di­cyano‐1κ²C‐trans‐bis­[N‐(2‐hydroxy­ethyl)­ethane‐1,2‐di­amine‐2κ²N,N′]­cadmium(II)­nickel(II)]‐μ‐cyano‐1:2′κ²C:N], [CdNi(CN)₄(C₄H₁₂N₂O)₂], consists of alternating square‐planar Ni(CN)₄ fragments, formally dianionic, and Cd(hydet‐en)₂ moieties [hydet‐en is N‐(2‐hydroxy­ethyl)­ethyl­ene­di­amine], with the two bridging cyanide ligands in a mutually trans disposition at the Ni atom and cis at the Cd atom. The resulting one‐dimensional zigzag chain structure has the Ni atom on an inversion center, while the distorted octahedron centered on the Cd atom lies on a twofold axis. The polymer chains are connected into undulating sheets by weak interchain N—H⋯N, N—H⋯O and O—H⋯N hydrogen bonds, which are also present between successive sheets.     

Bis­(ethyl­enedi­amine‐N,N′)(pyrimidine‐2‐carboxyl­ato‐N1,O)­cobalt(III) bis­(tri­fluoro­methane­sulfonate) dihydrate

In the title compound, the coordination geometry of the Co^III atom is only slightly distorted from regular octahedral, and the racemic nature of the material was confirmed by X‐ray structure analysis.     

Tris[N‐(4‐fluorophenyl)pyridine‐2‐carboxamidato‐κ2N,N′]cobalt(III) trihydrate: a novel meridional complex

The title complex, [Co(C₁₂H₈FN₂O)₃]·3H₂O, has been synthesized for the first time. The complex comprises three bidentate ligands containing the pyridine‐2‐carbox­amide stem. The distorted octahedral coordination around the Co atom is formed via the pyridine (py) N atom and the deprotonated amide N atom of each ligand, with the three pyridine rings in a meridional arrangement. For each ligand, the pyridine ring and the carbonyl group are nearly coplanar, with torsion angles in the range 0.4 (3)–4.8 (4)°. The Co—N_py distances [1.9258 (16)–1.9656 (17) Å] are shorter than the corresponding Co—N_amide distances [1.9372 (17)–1.9873 (15) Å]. In addition, the Co—N_py distances are closely related to the magnitudes of the chelate angles, a shorter Co—N_py distance corresponding to a larger angle. Five intermolecular hydrogen bonds, involving carbonyl O atoms of the ligands and lattice water mol­ecules, lead to the formation of a mesh structure.     

Bis­(acetone‐κO)­bis(N,N′‐di­methyl­ethyl­enedi­amine‐κ2N,N′)copper(II) diperchlorate

The title compound, [Cu(C₄H₁₂N₂)₂(C₃H₆O)₂](ClO₄)₂, is the first structurally characterized Cu^II complex having acetone as axial ligands. The complex adopts an elongated octahedral trans‐[CuN₄O₂] coordination geometry, with the Cu atom having 222 site symmetry. The axial Cu—O(acetone) and in‐plane Cu—N bond lengths are 2.507 (5) and 2.041 (3) Å, respectively.     

N‐(3H‐Thia­zol‐2‐yl­idene)­nitr­amine and N‐methyl‐N‐(thia­zol‐2‐yl)­nitr­amine

The geometries of the thia­zole ring and the nitr­amino groups in N‐(3H‐thia­zol‐2‐yl­idene)­nitr­amine, C₃H₃N₃O₂S, (I), and N‐­methyl‐N‐(thia­zol‐2‐yl)­nitr­amine, C₄H₅N₃O₂S, (II), are very similar. The nitr­amine group in (II) is planar and twisted along the C—N bond with respect to the thia­zole ring. In both structures, the asymmetric unit includes two practically equal mol­ecules. In (I), the mol­ecules are arranged in layers connected to each other by N—H⋯N and much weaker C—H⋯O hydrogen bonds. In the crystal structure of (II), the mol­ecules are arranged in layers bound to each other by both weak C—H⋯O hydrogen bonds and S⋯O dipolar interactions.     

Chloro­[N′,N′‐diethyl‐N,N‐bis(2‐pyri­dyl­methyl)­ethyl­enedi­amine‐κ4N]copper(II) perchlorate

The title mononuclear copper(II) complex, [CuCl(C₁₈H₂₆N₄)]ClO₄, shows a square‐pyramidal coordination with the diethyl­amino N atom at the apical position. Large anisotropies in the displacement parameters of the non‐H atoms of the ligand seem to be due to rotational disorder of the ClO₄^? anion.     

N,N′‐Bis­[1‐(pyrazin‐2‐yl)­ethyl­idene]­hydrazine

Molecules of the title compound, C₁₂H₁₂N₆, contain both a di­imine linkage and an N—N bond, and assume a planar structure. The compound lies about an inversion centre and there are three intramolecular C—H⋯N hydrogen bonds.     

[N′‐Benzoyl‐N,N‐bis(2‐pyridylmethyl‐κN)­ethyl­enedi­amine‐κN]chloro­copper(II) hexa­fluoro­phosphate

The title mononuclear copper(II) complex, [CuCl(C₂₁H₂₂­N₄O)]­PF₆, shows a distorted square‐planar coordination and the benzoyl­amino N atom does not coordinate to the Cu atom.     

Redetermination of the double salt Λ‐[tris­(ethyl­enediamine)­cobalt(III) trichloride]–sodium chloride–water (2/1/6)

The structure of the title compound, {[Co(C₂H₈N₂)₃]Cl₃}₂·‐[Na(H₂O)₆]Cl, has been redetermined to a higher degree of accuracy. The true space group is shown to be trigonal P3, but the structure is extremely close to hexagonal P6₃. Both of the independent Λ‐[Co(en)₃]Cl₃ moieties (en is ethyl­enedi­amine) and the [Na(H₂O)₆]Cl unit reside on sites of crystallographic threefold symmetry. The sodium and chloride ions share the same lattice positions and the whole [Na(H₂O)₆]Cl unit is disordered over two positions in an approximate ratio of 0.73:0.27.     

(–)‐(S)‐2‐(Fluoro­di­phenyl­methyl)­pyrrolidinium chloride

The title compound, C₁₇H₁₉FN⁺·Cl^?, has an ionic structure, and cations and anions are linked into infinite chains by Cl?H—N—H?Cl hydrogen bonds. The absolute configuration (S) was confirmed.     

trans‐Bis­[N‐(2‐hydroxy­ethyl)­ethyl­ene­di­amine‐κ2N,N′]­bis­(iso­thio­cyanato‐κN)­nickel(II)

The crystal structure of the title compound, [Ni(NCS)₂(C₄H₁₂N₂O)₂], has two crystallographically independent half‐mol­ecules in the asymmetric unit, with each Ni atom residing on a centre of symmetry. The two mol­ecules exhibit similar coordination geometry but display differences with regard to other structural features. Each Ni^II centre is octahedrally coordinated by two mutually trans chelating hydroxy­ethyl­ethyl­ene­di­amine ligands and two mutually trans iso­thio­cyanate ions. The two independent mol­ecules form chains through different types of non‐covalent interactions. In the case of one of the mol­ecules, only NCS and free OH groups participate in hydrogen bonding, while in the chain based on the second mol­ecule, the NCS, NH, NH₂ and free OH groups are involved in intermolecular hydrogen bonding. The two chains interact with one another through hydrogen bonding, forming planar sheets. The third packing direction is mediated only by van der Waals interactions.     

Bis­(ethyl­enedi­amine)copper(II) bis(O,O′‐diethyl di­thio­phosphate)

In the structure of the title compound, [Cu^II­(en)₂][(EtO)₂P(S)S]₂ (en is ethyl­ene­di­amine) or [Cu(C₂H₈N₂)₂](C₄H₁₀O₂PS₂)₂, the Cu atom lies on a center of inversion and is coordinated in a slightly distorted square coordination geometry by four N atoms from two ethyl­enedi­amine mol­ecules. The diethyl di­thio­phosphate moieties, (EtO)₂P(S)S^?, act as counter‐anions.     

Neutral bis­(ethyl­enedi­thio)­tetra­thia­fulvalene at 100 K

The low‐temperature crystal structure of bis­(ethyl­enedi­thio)­tetra­thia­fulvalene (BEDT‐TTF), C₁₀H₈S₈, is similar to its high‐temperature structure. The room‐temperature central bond lengths of this mol­ecule are often used as reference in empirical methods to estimate the charge carried by the (BEDT‐TTF)_xⁿ⁺ cations in the BEDT‐TTF mol­ecule‐based organic conductors. We show that the method we previously reported can still be used with low‐temperature BEDT‐TTF salts data. Moreover, we confirm the purely thermal origin of the ordering of the ethyl­ene group.     

[Tris(2‐amino­ethyl)­amine‐κ4N]chloro­(dimethyl sulfoxide‐O)­cobalt(III) diper­chlorate

The title compound, [CoCl(tren)(dmso)](ClO₄)₂ [tren is tris‐(2‐amino­ethyl)­amine, C₆H₁₈N₄; dmso is di­methyl sulfoxide, C₂H₆OS], is the first crystal structure reported with dmso coordinated to Co^III. It crystallizes with two independent mol­ecules in the asymmetric unit. A localized non‐crystallographic inversion centre is observed between the two cations.     

N‐(3‐Iodo­propyl)­phthal­imide

In the mol­ecule of the title compound, C₁₁H₁₀INO₂, the phthal­imide group is not exactly planar. The dihedral angle between the mean planes of the phthal­imide and iodo­propyl moieties is 76.6 (2)°. The structure is stabilized by intermolecular C—H?O and C—H?I interactions, and an intermolecular I?O interaction of 3.571 (4) Å, the latter linking the mol­ecules into infinite chains.     

Hemi[hexa­aqua­magnesium(II)] (μ‐2,6‐bis{[bis­(carboxyl­ato­methyl)­amino]­methyl}‐4‐chloro­phenolato)­bis­[di­aqua­magnesium(II)] decahydrate

The crystal structure of the title compound, [Mg(H₂O)₆]_0.5[Mg₂(C₁₆H₁₄ClN₂O₉)(H₂O)₄]·10H₂O, shows that this bi­nuclear complex consists of two Mg centres in distorted octahedral geometry, joined by an oxo bridge which is a derivative of the deprotoned hydroxy group of the phenolate in the ligand mol­ecule. In the anion, the coordination sphere of each Mg^II ion is completed by two carboxyl­ates, a tertiary N atom and two water mol­ecules. The inner coordination spheres for the Mg^II ions are very similar, both in ligand sets and in geometry. Each unit of the binuclear complex has one negative charge neutralized by a neighbouring hydrated cation, [Mg(H₂O)₆]²⁺, in which the Mg atom lies on an inversion centre. In each cell, there are 34 water mol­ecules and most of them participate in the formation of hydrogen bonds, which contribute greatly to the stability of the whole structure.