1,3‐Propane­di­ammonium tetra­thio­tungstate and N,N,N′,N′‐tetra­methyl­ethyl­enedi­ammonium tetra­thio­tungstate

The title complexes, (C₃H₁₂N₂)[WS₄] and (C₆H₁₈N₂)[WS₄], contain tetrahedral [WS₄]²⁻ dianions, which accept a complex series of hydrogen bonds from the organic dications. The strength and number of these hydrogen bonds affect the W—S distances.     

Hydrogen bonding in N,N,N′,N′‐tetra­methyl­ethyl­ene­di­ammonium bis­(benzene­selenol­ate)

The crystal structure of the title compound, [Me₂NHC₂H₄NHMe₂][SePh]₂ or C₆H₁₈N₂²⁺·2C₆H₅Se^?, reveals hydrogen bonding between the benzene­seleno­late anions and the tetra­methyl­ethyl­ene­di­ammonium cations. The asymmetric unit contains one formula unit of the title compound. The two Se?H distances are 2.22 (4) and 2.34 (4) Å.     

N,N,N′,N′‐Tetra­methyl­ethyl­enedi­ammonium dichloride

The structure of the title compound, C₆H₁₈N₂²⁺.2Cl^?, has been determined and has a centre of symmetry. The mol­ecule has strong intermolecular hydrogen bonding between each Cl^? and an N—H bond [Cl?N = 3.012 (3) Å].     

[Benzyl­bis­(di­methyl­amino)­methyl­silyl‐κ2C,N](N,N,N′,N′‐tetra­methyl­ethyl­ene­di­amine‐κ2N,N)­lithium(I)

The title compound, [Li(C₁₂H₂₁NSi)(C₆H₁₆N₂)], is an intermediate in the synthesis of the corresponding organometallic compounds. The mol­ecule has an unusual C—Si—N—Li four‐membered heterocycle which adopts a folded conformation, with the coordination around the Li, N, C and Si atoms being distorted tetrahedral. Its structure is strongly supported by ¹H NMR, ¹³C NMR and ¹³C–¹H correlation spectra. The compound has potential for application in the synthesis of other novel organometallic compounds.     

A uniform and one‐dimensional stacking of 2,5‐di­chloro­tetra­cyano­quinodimethanide mol­ecules in the tetra­methyl­arsonium salt

In the tetra­methyl­arsonium salt of 2,5‐di­chloro‐7,7,8,8‐tetra­cyano­quinodimethanide [systematic name: tetra­methyl­arson­ium 2,2′‐(2,5‐dichlorocyclohexa‐2,5‐diene‐1,4‐diylidene)bis(propanedinitrile)], C₄H₁₂As⁺·C₁₂H₂Cl₂N₄^? or [As(CH₃)₄](C₁₂H₂Cl₂N₄), the cation lies disordered about a twofold axis and the radical ion lies about an inversion center forming a uniform [interplanar distance 3.35 (2) Å] and one‐dimensional stacking without any slip. The electrical conductivity of the single crystal at room temperature was less than 10^?9 S cm^?1, and the temperature dependence of para­magnetic susceptibility obeyed a one‐dimensional antiferromagnetic Heisenberg model with a spin‐exchange integral of 83 K in the temperature range 1.8–320.0 K.     

trans‐Di­aqua(C‐meso‐5,12‐di­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane‐N,N′,N′′,N′′′)copper(II) dichloride dihydrate

The crystal structure of the title complex, [Cu(C₁₂H₂₈N₄)(H₂O)₂]Cl₂·2H₂O, has been determined. The Cu^II atom is octahedrally coordinated by the four N atoms of the tetradentate macrocyclic ligand in equatorial positions and by the O atoms of two water mol­ecules in axial positions. The crystal structure is stabilized by a three‐dimensional network of hydrogen bonds.     

N,N′,N′′,N′′′‐Tetraethylterephthalamidinium bis(tetrazolate)

The crystal structure of the title 2:1 salt of tetrazole and a substituted terephthal­amidine, C₁₆H₂₈N₄²⁺·2CHN₄^?, contains an infinite network of hydrogen bonds, with short N?N distances of 2.820 (2) and 2.8585 (19) Å between the tetrazolate anion and the amidinium cation. Involvement of the lateral N atoms of the tetrazole in the hydrogen bonding appears to be a typical binding pattern for the tetrazolate anion.     

N,N′‐Bis­(dipiperidin‐1‐yl­methyl­ene)propane‐1,3‐di­amine and N,N′‐bis(1,3‐di­methyl­per­hydro­pyrimidin‐2‐yl­idene)­propane‐1,3‐di­amine

The molecular structures of the title compounds, C₂₅H₄₆N₆ and C₁₅H₃₀N₆, respectively, show the two guanidyl moieties each connected by propyl bridges. The different substitution pattern of the guanidyl groups has no influence on the distinct localization of their C=N double bonds. Both compounds exhibit approximate twofold symmetry and the crystal packing shows no prominent hydrogen‐bonding interactions.     

(12‐Hydro­xy­methyl‐5,5,7,12,14‐penta­methyl‐1,4,8,11‐tetra­aza­cyclo­tetra­decane‐N‐acetato‐N,N′,N′′,N′′′,O,O′)cobalt(III) chloride perchlorate monohydrate

In the title compound, [Co(C₁₈H₃₇N₄O₃)](ClO₄)Cl·H₂O, the Co^III ion has a distorted octahedral geometry, with four N atoms and two O atoms constituting the coordination sphere. The crystal structure is stabilized by a three‐dimensional network of hydrogen bonds.     

N,N,N′,N′‐Tetra­methyl­ethyl­ene­diammonium–succinate–succinic acid (1/1/1)

In the title compound, C₆H₁₈N₂²⁺·C₄H₄O₄²⁻·C₄H₆O₄, the components lie on centres of symmetry in space group , such that the asymmetric unit contains three half‐mol­ecules. Despite the different mode (with respect to other di­carboxylic acids) adopted by the intermolecular self‐interaction of succinic acid derivatives, the overall structure of the title compound consists of anionic layers that are typical of the packing structures exhibited by other di­carboxylic acid analogues.     

Bis­[N,N′‐bis­(di­phenyl­methyl­ene)ethyl­enedi­amine‐κ2N,N′]copper(I) di­chloro­cuprate(I)

The 1:1 adduct of N,N′‐bis­(di­phenyl­methyl­ene)­ethyl­enedi­amine (bz₂en) with copper(I) chloride, viz. [Cu(C₂₈H₂₄N₂)₂][CuCl₂], has been synthesized. The structure contains cationic moieties of Cu^I ions (Cu on a twofold axis) coordinated to four N atoms of two bz₂en mol­ecules (in a distorted tetrahedron) and linear di­chloro­cuprate(I) anions (with Cu on an inversion centre). These cations and anions are packed in columns along b. The packing of the cation and anion columns involves a significant C—H⋯Cl interaction and four short intermolecular C—H⋯π contacts, two of which are between cation columns.     

A second polymorphic form of N,N′‐di­phenyl‐1,4‐phenyl­ene­di­amine

A new triclinic polymorphic form of N,N′‐di­phenyl‐1,4‐phenyl­ene­di­amine (C₆H₅NHC₆H₄NHC₆H₅) has been obtained through appropriate recrystallization of the orthorhombic form. It crystallized in the centrosymmetric space group P, with two half mol­ecules as the asymmetric unit.     

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,N′‐Bis(2‐tosylaminobenzylidene)benzene‐1,2‐di­amine

The conformation of the title compound, C₃₄H₃₀N₄O₄S₂, is strongly influenced by intramolecular N—H?N hydrogen‐bond interactions and by the rigidity endowed by the presence of a phenyl group between the imine N atoms. The molecule is not planar, with very short distances between the imine N atoms [N?N 2.753 (3) Å] and the amine N atoms [N?N 5.148 (4) Å]. Consequently, important changes in its conformation will be required if it is to act as a tetradentate ligand via its four N atoms.     

N,N,N′,N′‐Tetrasubstituted Piperazinium Salts of Perfluorinated Acids

Well crystallized diquaternary piperazinium salts of perfluorocarboxylic acids can be prepared by thermal rearrangement of a primary product obtained from the appropriate fluorinated acid chloride and N,N‐dialkylamino‐ethanol. The mechanism of the ring closure step is discussed. The synthetic strategy easily gives access to structurally different piperazinium perfluorocarboxylates. The title compounds show surface activity and can be regarded as ionic amphiphiles.     

[N,N′‐Bis(3‐aminopropyl)ethylenediamine‐κ4N,N′,N′′,N′′′](trithiocyanurato‐κ2N,S)zinc(II) ethanol solvate

In the crystal structure of the title compound, [N,N′‐bis(3‐­amino­propyl)­ethyl­enedi­amine‐κ⁴N,N′,N′′,N′′′][1,3,5‐triazine‐2,4,6(1H,3H,5H)‐tri­thionato(2−)‐κ²N,S]­zinc(II) ethanol sol­vate, [Zn(C₈H₂₂N₄)₂(C₃HN₃S₃)]·C₂H₆O, the Zn^II atom is octa­hedrally coordinated by four N atoms [Zn—N = 2.104 (2)–2.203 (2) Å] of a tetradentate N‐donor N,N′‐bis(3‐­amino­propyl)­ethyl­enedi­amine (bapen) ligand and by two S and N atoms [Zn—S = 2.5700 (7) Å and Zn—N = 2.313 (2) Å] of a tri­thio­cyanurate(2−) (ttcH²⁻) dianion bonded as a bidentate ligand in a cis configuration. The crystal structure of the compound is stabilized by a network of hydrogen bonds.     

Layered (ethyl­ene­di­amine‐κ2N,N′)cobalt(II) molybdate(VI)

The structure of poly­[[(ethyl­enedi­amine‐κ²N,N′)­cobalt(II)]‐μ‐tetra­oxo­molyb­dato(VI)], [Co(C₂H₈N₂)MoO₄]_n or [CoMoO₄(C₂H₈N₂)]_n, is composed of puckered layers constructed from MoO₄ tetrahedra and CoN₂O₄ octahedra, with the ethyl­enedi­amine ligand coordinated to the Co atom in a cis fashion. Each pair of cobalt sites forms a binu­clear edge‐sharing unit through a {Co₂O₂} interaction. The binuclear octahedral units are interconnected through the bridging MoO₄ tetrahedra into a layer structure.     

Non‐merohedrally twinned crystals of N,N′‐bis(3‐methyl­phenyl)‐N,N′‐di­phenyl‐1,1′‐bi­phenyl‐4,4′‐di­amine: an excellent tri­phenyl­amine‐based hole transporter

N,N′‐Bis(3‐methyl­phenyl)‐N,N′‐di­phenyl‐1,1′‐bi­phenyl‐4,4′‐di­amine (TPD), C₃₈H₃₂N₂, crystallizes in the monoclinic space group P2₁ with a pseudo‐orthogonal lattice, rather than the previously reported orthorhombic space group P2₁2₁2₁ [Kennedy, Smith, Tackley, David, Shankland, Brown & Teat (2002). J. Mater. Chem. 12 , 168–172]. The asymmetric unit consists of two independent mol­ecules, A and B, which are arranged along the [100] direction to form vertical layers of alternately stacked A and B mol­ecules. Molecule A shows a great deal of rotational movement in the four terminal aryl rings, resulting in two disordered tolyl groups split over two sites, while mol­ecule B exhibits an almost cis configuration of the two terminal tolyl groups with respect to these ring planes.     

The solid dihydrate of N,N‐di­methyl‐n‐tetra­decyl­amine oxide

Crystalline N,N‐di­methyl‐n‐tetra­decyl­amine oxide has been prepared by reaction of liquid N,N‐di­methyl‐n‐tetra­decyl­amine with 70% H₂O₂ in the presence of CO₂ as catalyst. The resulting soft low‐melting solid was crystallized as the dihydrate, viz. C₁₆H₃₅NO·2H₂O. The extended hydro­carbon chains pack in a parallel fashion, with the N‐oxide ends of the mol­ecules forming hydrogen bonds with the water mol­ecules in hydro­philic layers. The N—O distance is 1.411 (3) Å.