Bis­[μ‐3{5}‐(2‐pyridyl)­pyrazolido]­bis­[(aceto­nitrile)copper(II)] diperchlorate

The title compound, [Cu₂(C₈H₆N₃)₂(C₂H₃N)₂](ClO₄)₂, con­tains a centrosymmetric dinuclear dication, with square‐pyrami­dal Cu^II centres linked by two 1,2‐pyrazolide bridging groups. There is a weak apical interaction between each Cu ion and a perchlorate O atom.     

(Acetonitrile‐κN){2‐[bis­(2‐pyridylethyl)­amino]ethanol‐κ4N,N′,N′′,O}zinc(II) bis­(perchlorate) monohydrate

In the title compound, [Zn(C₂H₃N)(C₁₆H₂₁N₃O)](ClO₄)₂·H₂O, the Zn^II ion is coordinated by two pyridyl N atoms, one amine N atom, and an ethanol O atom from the N,N′,N′′,O‐tetra­dentate 2‐[bis­(2‐pyridylethyl)amino]­ethanol donor ligand. The fifth coordination site is filled by an acetonitrile N atom, and there is one solvent water mol­ecule in the asymmetric unit. The 2+ charge of the cationic portion of the complex is balanced by two perchlorate counter‐anions.     

Ethyl N‐[2‐(hydroxy­acetyl)­phenyl]­carbamate,ethyl N‐[2‐(hydroxy­acetyl)‐4‐iodo­phenyl]­carbamate and ethyl N‐[2‐(hydroxy­acetyl)‐4‐methyl­phenyl]­carbamate

In ethyl N‐[2‐(hydroxy­acetyl)phenyl]carbamate, C₁₁H₁₃NO₄, all of the non‐H atoms lie on a mirror plane in the space group Pnma; the mol­ecules are linked into simple chains by a single C—H⋯O hydrogen bond. The mol­ecules of ethyl N‐[2‐(hydroxy­acetyl)‐4‐iodo­phenyl]carbamate, C₁₁H₁₂INO₄, are linked into sheets by a combination of O—H⋯I and C—H⋯O hydrogen bonds and a dipolar I⋯O contact. Ethyl N‐­[2‐(hydroxy­acetyl)‐4‐methyl­phenyl]carbamate, C₁₂H₁₅NO₄, crystallizes with Z′ = 2 in the space group P; pairs of mol­ecules are weakly linked by an O—H⋯O hydrogen bond and these aggregates are linked into chains by two independent aromatic π–π stacking inter­actions.     

cis‐Bis­[1,3‐bis(2‐fluoro­phenyl)­triazenido‐κ2N1,N3]­bis­(pyridine‐κN)cadmium(II)

In the title compound, [Cd(C₁₂H₈F₂N₃)₂(C₅H₅N)₂], the Cd atom lies on a crystallographic twofold axis in space group Iba2. The coordination geometry about the Cd^II ion corresponds to a rhombically distorted octahedron, with two deprotonated 1,3‐bis(2‐fluoro­phenyl)­triazenide ions, viz. FC₆H₄NNNC₆H₄F⁻, acting as bidentate ligands (four‐electron donors). Two neutral pyridine (py) mol­ecules complete the coordination sphere in positions cis with respect to one another. The triazenide ligand is not planar (r.m.s. deviation = 0.204 Å), the dihedral angle between the phenyl rings of the terminal 2‐fluoro­phenyl substituents being 24.6 (1)°. The triazenide and pyridine Cd—N distances are 2.3757 (18)/2.3800 (19) and 2.3461 (19) Å, respectively. Intermolecular C—H⋯F interactions generate sheets of mol­ecules in the (010) plane.     

Carbonyl­[di­hydro­bis­(pyrazol‐1‐yl‐κN2)­borato]­hydrido­bis­(tri‐p‐tolyl­phosphine‐κP)­ruthenium(II)

The title compound, [RuH(C₆H₈BN₄)(C₂₁H₂₁P)₂(CO)], possesses two trans‐disposed tri‐p‐tolyl­phosphines in axial positions and the remaining ligands in equatorial positions. The overall geometry of the Ru^II ion is a distorted octahedral structure. The P—Ru—P axis deviates from linearity by about 13°. This distortion arises mainly from the steric congestion between the bulky phosphine moieties and the tetrahedral di­hydro­bis­(pyrazol‐1‐yl)­borate ligands.     

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[bis­(methoxy­carbimido)amine‐κ2N,N′]bis­(perchlorato‐κO)copper(II) bis­[bis­(methoxy­carbimido)amine‐κ2N,N′]bis­(methanol‐κO)copper(II) bis­(perchlorate) methanol disolvate

The title compound, [Cu(ClO₄)₂(C₄H₉N₃O₂)₂][Cu(C₄H₉N₃O₂)₂(CH₄O)₂](ClO₄)₂·2CH₃OH, comprises two independent Cu^II species lying on different inversion sites. In the Cu complexes, a distorted octa­hedral geometry arises (from basic square‐planar N₄ coordination) from the weak coordination of two perchlorate ions (as Cu—O) in one species and two methanol mol­ecules in the other (also as Cu—O). Inter­actions between the O atoms of the perchlorate anions or methanol groups and the imide or amine NH groups afford an extensive inter­molecular hydrogen‐bonding network.     

(2,2′‐Bi­pyridine‐κ2N)­bis­[N‐(2‐pyridyl‐κN)‐p‐toluene­sulfon­amido‐κN]zinc(II)

The structure of the title compound, [Zn(C₁₂­H₁₁­N₂­O₂S)₂(C₁₀H₈N₂)], consists of monomeric mol­ecules in which the central ZnN₂N′N′′ unit has a distorted tetrahedral geometry, with bond lengths ranging from 2.020 (3) to 2.109 (3) Å. The anionic ligands are potential bidentate donors and thus there are two secondary Zn—N interactions. The shorter of these is 2.317 (3) Å and completes at the Zn atom an irregular five‐coordinated geometry, which can be described as a square pyramid showing 30% distortion towards the trigonal bipyramid; the other Zn—N contact is much longer at 2.549 (3) Å.     

Tetrakis­[1‐(3‐chloro­propyl)‐1,2,4‐tri­azole‐κN4]­bis­(tetrafluoroborato‐κF)copper(II)

In the title complex, [Cu(BF₄)₂(1tpc)₄] [1tpc is 1‐(3‐chloro­propyl)‐1,2,4‐triazole, C₅H₈ClN₃], the copper(II) centres reside in a tetragonally distorted octahedral coordination environment. Four 1tpc ligands are coordinated to the metal atom via the N4 atom of the triazole rings in a square‐planar arrangement, with Cu—N bond lengths in the range 2.002 (2)–2.019 (2) Å. Two tetra­fluoro­borate anions, in the axial positions above and below the square plane, are weakly coordinated to the copper(II) centre, with Cu—F distances of 2.4009 (18) and 2.5096 (18) Å.     

N‐[1‐(Penta­fluoro­phenyl)­ethyl]­acetamide

The title compound, C₁₀H₈F₅NO, crystallizes as a racemate with four symmetry‐independent mol­ecules in the asymmetric unit. The four mol­ecules form two hydrogen‐bonded pairs. Each pair is a building unit of an independent C(4) chain propagating parallel to the ab plane.     

A novel dimeric zinc(II) complex: bis­[μ‐1,2‐bis­(1H‐1,2,4‐triazol‐1‐yl)­ethane‐κ2N4:N4′]­bis­[diisothio­cyanato­zinc(II)]

The coordination geometry of the Zn^II atom in the title complex, [Zn₂(NCS)₄(C₆H₈N₆)₂], is that of a distorted tetra­hedron, in which the Zn^II atom is coordinated by four N atoms from the triazole rings of two symmetry‐related 1,2‐bis­(1,2,4‐triazol‐1‐yl)ethane ligands and two thio­cyanate ligands. Two Zn^II atoms are bridged by two organic ligands to form a dimer. The dimer lies about an inversion center.     

3,6‐Di­chloro‐4‐[2‐(4‐thia­morpholino)­ethanesulfanyl]­pyridazine and 3,6‐bis­(pyrazol‐1‐yl)‐4‐[2‐(4‐thia­mor­pho­lino)­ethanesulfanyl]­pyridazine

The trans–trans conformations adopted by the derivatized bis­(bidentate) chelating N₄‐donor ligand 3,6‐bis­(pyrazol‐1‐yl)‐4‐[2‐(4‐thia­morpholino)­ethanesulfanyl]­pyridazine, C₁₆H₁₉N₇S₂, and an intermediate in its formation, 3,6‐di­chloro‐4‐[2‐(4‐thia­morpholino)­ethanesulfanyl]­pyridazine, C₁₀H₁₃Cl₂N₃S₂, con­trast with the cis–cis conformation found previously for 3,6‐bis­(thio­phen‐2‐yl)­pyridazine [Ackers, Blake, Hill & Hubberstey (2002). Acta Cryst. C 58 , o640–o641], which places all four heteroatoms on the same side of the mol­ecule.     

Di­aqua­bis­[μ‐(R,R)‐tartrato‐κ4O1,O2:O3,O4]­dinickel(II) trihydrate

In the crystal structure of the title compound, [Ni₂(C₄H₄O₆)₂(H₂O)₂]·3H₂O, two nickel cations, two tartrate anions and two water mol­ecules form the dimeric complex. Each nickel cation is in a distorted octahedral environment composed of four O atoms of two crystallographically independent tartrate anions, one water mol­ecule and one O atom of a symmetry‐equivalent tartrate anion. The asymmetric unit contains three additional water mol­ecules which are connected via hydrogen bonding.     

Bis(μ‐diphenyl­phosphinato‐κ2O:O′)bis­[aqua­(diphenyl­phosphinato‐κO)bis­(pyridine‐κN)cobalt(II)]

In the centrosymmetric title compound, [Co₂(C₁₂H₁₀O₂P)₄(C₅H₅N)₄(H₂O)₂], each approximately octa­hedral Co atom features two trans‐coordinated pyridine mol­ecules, one water mol­ecule, a terminally coordinated monodentate diphenyl­phosphinate ligand, and two bidentate diphenyl­phosphinate ligands that bridge the two Co atoms across a centre of inversion to form a dimeric binuclear complex. The discrete mol­ecules are linked by double hydrogen bonds between the terminally coordinated diphenyl­phosphinate ligand and the water mol­ecule to form a continuous chain along the crystallographic b axis.     

N‐(4‐Methoxy­benzyl­idene)‐N′‐(2‐pyridyl)­hydrazine

Molecules of the title compound (alternative name p‐methoxybenzaldehyde 2‐pyridyl­hydrazone), C₁₃H₁₃N₃O, adopt an E configuration about the azomethine C=N double bond. Molecules are almost planar, the dihedral angle between the pyridine and methoxy­phenyl rings being only 6.19 (12)°. Pairwise N—H⃛N hydrogen bonds [R(8) in graph‐set notation] link centrosymmetrically related mol­ecules into discrete pairs.     

Chloro­bis­[N‐ethoxy­carbonyl‐N′‐(p‐methoxy­phenyl)­thio­urea‐κS]copper(I)

The title copper(I) complex, [CuCl(C₁₁H₁₄N₂O₃S)₂], was synthesized by the redox reaction of cupric chloride with the corresponding thio­urea derivative as reducing agent. The Cu^I coordination environment is trigonal planar, involving two S atoms and one Cl atom. The presence of intramolecular hydrogen bonds leads to the formation of a cis conformation and promotes the stability of the complex.     

2,4‐Di­hydroxy‐1,3‐bis­(methoxy­carbonyl­methoxy)­calix­[4]­arene and 1,3‐bis­(ethoxy­carbonyl­methoxy)‐2,4‐di­hydroxy­calix­[4]­arene chloro­form solvate

The two title calix­[4]­arene compounds, C₃₄H₃₂O₈, (I), and C₃₆H₃₆O₈·CH₃Cl, (II), respectively, which differ only in the size of the alkyl function on the pendant ester group, are compared. Compound (I) forms a novel supramolecular array, whilst (II) fails to do so due to accommodating a chloro­form guest molecule in the lower‐rim cavity.     

Di‐μ‐methoxo‐bis({N,N′‐bis­[2‐(3,5‐di­methyl­pyrazol‐1‐yl)­ethyl]­amine‐κ3N}copper(II)) bis­(hexa­fluoro­phosphate)

The title compound, [Cu₂(C₁₄H₂₃N₅)₂(CH₃O)₂](PF₆)₂, has a doubly methoxo‐bridged centrosymmetric copper dimer cation involving two tridentate bis­(pyrazolyl)­amine ligands. The geometry of each Cu^II atom is a distorted square pyramid with two N atoms of the pyrazole in bis­[2‐(3,5‐di­methyl‐1‐pyrazolyl)­ethyl]­amine (bpea) and two μ₂‐bridging O atoms of the methoxo ligands forming the basal plane, and the amine N atom occupying the axial position. In the bridging plane, the Cu—O bond lengths are 1.940 (4) and 1.942 (4) Å, and the bond angles for O—Cu—O and Cu—O—Cu are 76.1 (2) and 103.9 (2)°, respectively. The Cu?Cu distance is 3.058 (1) Å. The central four‐membered ring lies on an inversion centre.     

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.     

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.