A cyclo-octa-trienone complex of diiron hexa-carbon-yl.

In the title compound, [µ-(2,6,7-η:3,4,5-η)-cycloocta-2,4,6-trienone]bis-(tri-carbonyl-iron)(Fe-Fe), [Fe2(C8H8O)(CO)6], the diiron hexa-carbonyl moiety has a sawhorse arrangement, with the OC-Fe-Fe-CO fragment forming the horizontal bar of the horse, and the other four carbonyl groups the legs. The Fe-Fe distance is 2.795 (2) Å. Each Fe atom is also bonded to three C atoms of the cyclo-octa-trienone ring. One Fe atom forms a σ-bond with one ring C atom, with Fe-C = 2.109 (2) Å, and also a metal-olefin π-bond with two C atoms on the other side of the ring, with Fe-C distances of 2.238 (2) and 2.236 (3) Å. The second Fe atom forms a η(3)-allyl bond with three other ring atoms, with Fe-C bond lengths of 2.158 (2), 2.062 (2), and 2.123 (3) Å. Counting the π- and π-allyl inter-actions as one bond, the coordinations of the Fe atoms can, respectively, be approximated as octa-hedral and trigonal bipyramidal.

Crystal structure of poly[(µ3-thio-cyanato-κ(3) N:S:S)(tri-methyl-phosphine sulfide-κS)copper(I)].

In the title compound, [Cu(NCS)(C3H9PS)] n , the thio-cyanate ions bind the Cu(I) atoms covalently, forming infinite -Cu-SCN-Cu- chains parallel to the a axis. Each Cu(I) atom is also coordinated to a tri-methyl-phosphine sulfide group via a Cu-S bond. Two crystallographically independent chains propagate in opposite directions, and are held together in a ribbon arrangement by long bonds between Cu(I) atoms in the first chain and thio-cyanate S atoms in the second, with Cu-S = 2.621 (1) Å. The geometry around the Cu(I) atoms in the first chain is distorted tetra-hedral, with angles involving the long Cu-S bond much less than ideal, and the S-Cu-N angle between the phosphine sulfide S atom and the thio-cyanate N atom opening out to 133.19 (9)°. Each Cu(I) atom in the second chain appears to be disordered between two positions 0.524 (4) Šapart, with occupancy factors of 0.647 (6) and 0.353 (6). The Cu(I) atom in the major site is in a distorted trigonal-planar configuration, with the S-Cu-N angle between the phosphine sulfide and the thio-cyanate N atom again opened out, to 137.01 (15)°. The Cu(I) atom in the minor site, however, forms in addition a long bond [Cu-S = 2.702 (5) Å] to the phosphine sulfide of the first chain, not the thio-cyanate S atom, to provide a further link between the chains.

µ-Cyanido-κ(2) C:N-dicyanido-κ(2) C-bis-(N-ethyl-ethylenedi-amine-κ(2) N,N')copper(II)copper(I).

In the title complex, [Cu(I)Cu(II)(CN)3(C4H12N2)2], the Cu(I) and Cu(II) ions and a bridging cyanide group lie on a twofold rotation axis. The Cu(II) ion is in a slightly-distorted square-pyramidal coordination environment, with the N atoms of the two symmetry-related N-ethyl-ethylenedi-amine ligands occupying the basal positions and an N-bonded cyanide group in the apical position. The Cu(I) ion is in a trigonal-planar coordination environment, bonded to the C atom of the bridging cyanide group and to two terminal cyanide groups. In the crystal, N-H⋯N hydrogen bonds involving two of the symmetry-unique N-H groups of the N-ethyl-ethylenedi-amine ligands and the N atoms of the terminal cyanide ligands link the mol-ecules into strands along [010].

Methyl 3,5-bis(cyclo-hexyl-meth-oxy)benzoate.

In the title compound, C22H32O4, the atoms of the methyl ester group and the alk-oxy O atoms are all coplanar with the central aromatic ring, with an r.m.s. deviation of 0.008 Å. Bonds to the methyl-ene and cyclo-hexyl groups are also very close to this plane, so that the mol-ecule is essentially flat, apart from the cyclo-hexyl groups. The mean planes through the cyclo-hexyl groups are tilted by 30.08 (9) and 36.14 (7)° with respect to the central aromatic ring. In the crystal, pairs of mol-ecules linked by C-H⋯O hydrogen bonds form planar units which are stacked along the a axis, with an average inter-planar distance of 3.549 (2) Å. Stacking appears to be stabilized by further weak C-H⋯O hydrogen bonds.

erythro-{1-Bromo-1-[(1-phenyl-eth-yl)sulfon-yl]eth-yl}benzene.

The title compound, C16H17BrO2S, crystallizes as the erythro (RR/SS) isomer of a pair of sulfones that were diastereomeric due to chirality of the α-carbon atoms on the sulfone sulfur atom. The structural analysis was pivotal in showing that the 1,3 elimination reactions of these compounds, which lead to substituted stilbenes, occur with inversion at each asymmetric carbon atom. In the crystal, C-H⋯Br and C-H⋯O hydrogen bonds link the mol-ecules into a tri-periodic inter-molecular network.

Poly[tris-(2-amino-butan-1-ol)copper(II) [hexa-kis-µ2-cyanido-κ12 C:N-tetra-copper(I)] bis-(2-amino-butan-1-olato)aqua-copper(II) monohydrate].

The title structure, {[Cu(C4H11NO)3][Cu4(CN)6]·[Cu(C4H10NO)2(H2O)]·H2O} n , is made up of diperiodic honeycomb CuICN networks built from [Cu4(CN)6]2- units, together with two independent CuII complexes: six-coord-inate [Cu(CH3CH2CH(NH2)CH2OH)3]2+ cations, and five-coordinate [Cu(CH3CH2CH(NH2)CH2O)2·H2O] neutral species. The two CuII complexes are not covalently bonded to the CuICN networks. Strong O-H⋯O hydrogen bonds link the CuII complexes into pairs and the pairs are hydrogen bonded into chains along the crystallographic b axis via the hydrate water mol-ecule. In addition, O-H⋯(CN) and N-H⋯(CN) hydrogen bonds link the cations to the CuCN network. In the honeycomb polymeric moiety, all bridging cyanido ligands are disordered over two orientations, head-to-tail and tail-to-head, with occupancies for C and N atoms varying for each CN group.

Crystal structures, electron spin resonance, and thermogravimetric analysis of three mixed-valence copper cyanide polymers.

The crystal structures of three mixed-valence copper cyanide alkanolamine polymers are presented, together with thermogravimetric analysis (TGA) and electron spin resonance (ESR) data. In all three structures, a CuII moiety on a crystallographic center of symmetry is coordinated by two alkanolamines and links two CuICN chains via cyanide bridging groups to form diperiodic sheets. The sheets are linked together by cuprophilic CuI-CuI interactions to form a three-dimensional network. In poly[bis(µ-3-aminopropanolato)tetra-µ-cyanido-dicopper(I)dicopper(II)], [Cu4(CN)4(C3H8NO)2]n, 1, propanolamine bases have lost their hydroxyl H atoms and coordinate as chelates to two CuII atoms to form a dimeric CuII moiety bridged by the O atoms of the bases with CuII atoms in square-planar coordination. The ESR spectrum is very broad, indicating exchange between the two CuII centers. In poly[bis(2-aminopropanol)tetra-µ-cyanido-dicopper(I)copper(II)], [Cu3(CN)4(C3H9NO)2]n, 2, and poly[bis(2-aminoethanol)tetra-µ-cyanido-dicopper(I)copper(II)], [Cu3(CN)4(CH7NO)2]n, 3, a single CuII atom links the CuICN chains together via CN bridges. The chelating alkanolamines are not ionized, and the OH groups form rather long bonds in the axial positions of the octahedrally coordinated CuII atoms. The coordination geometries of CuII in 2 and 3 are almost identical, except that the Cu-O distances are longer in 2 than in 3, which may explain their somewhat different ESR spectra. Thermal decomposition in 2 and 3, but not in 1, begins with the loss of HCN(g), and this can be correlated with the presence of OH protons on the ligands in 2 and 3, which are not present in 1.

Crystal structures of two formamidinium hexa-fluorido-phosphate salts, one with batch-dependent disorder.

Syntheses of the acyclic amidinium salts, morpholino-formamidinium hexa-fluorido-phosphate [OC4H8N-CH=NH2]PF6 or C5H11N2O+·PF6 -, 1, and pyrrolidinoformamidinium hexa-fluorido-phosphate [C4H8N-CH= NH2]PF6 or C5H11N2 +·PF6 -, 2, were carried out by heating either morpholine or pyrrolidine with triethyl orthoformate and ammonium hexa-fluorido-phosphate. Crystals of 1 obtained directly from the reaction mixture contain one cation and one anion in the asymmetric unit. The structure involves cations linked in chains parallel to the b axis by N-H⋯O hydrogen bonds in space group Pbca, with glide-related chains pointing in opposite directions. Crystals of 1 obtained by recrystallization from ethanol, however, showed a similar unit cell and the same basic structure, but unexpectedly, there was positional disorder [occupancy ratio 0.639 (4):0.361 (4)] in one of the cation chains, which lowered the crystal symmetry to the non-centrosymmetric space group Pca21, with two cations and anions in the asymmetric unit. In the pyrrolidino compound, 2, cations and anions are ordered and are stacked separately, with zigzag N-H⋯F hydrogen-bonding between stacks, forming ribbons parallel to (101), extended along the b-axis direction. Slight differences in the delocalized C=N distances between the two cations may reflect the inductive effect of the oxygen atom in the morpholino compound.

Sodium bis-(ethyl-enedi-amine)-copper(II) tetra-cyanido-cuprate(I).

The title compound, Na[Cu(en)2][Cu(CN)4], where en represents ethyl-enedi-amine, NH2CH2CH2NH2, crystallizes as a salt with two distinct cations, Na(+) and [Cu(II)en2](2+), and discrete [Cu(I)(CN)4](3-) anions. The anion geometry is tetra-hedral, with angles at the copper atom ranging from 105.0 (1) to 115.4 (1)°. The Cu-C distances are in the range 1.976 (3) to 1.993 (3) Å. The divalent copper atom is coordinated by four N atoms of the two bidentate en ligands in a slightly distorted square-planar geometry. In the crystal, each sodium ion inter-acts with cyanide N atoms of four different anions, with Na-N distances lying in the narrow range of 2.344 (3) to 2.367 (3) Å, and an approximately tetra-hedral arrangement around the sodium ions. The inter-acting sodium ions and [Cu(I)(CN)4](3-) anions form a three-dimensional network with channels which contain the [Cu(en)2](2+) cations. One of the chelate rings in the cation shows partial disorder between two different conformations and the C atoms were refined with occupancies in the ratio 0.817 (15):0.183 (15).

Benzene-1,3,5-triyl tribenzoate.

The title compound, C27H18O6, commonly known as phloroglucinol tribenzoate, is a standard unit for the family of benzyl ether dendrimers. The central phloroglucinol residue is close to planar, with out-of-plane distances for the three oxygen atoms of up to 0.095 (3) Å, while the three attached benzoate groups are approximately planar. One benzoate group is twisted [C-C-O-C torsion angle = 98.2 (3)°] from the central plane, with its carbonyl O atom 2.226 (4) Šabove that plane, while the other two benzoate groups are twisted in the opposite direction [C-C-O-C torsion angles = 24.7 (2) and 54.8 (2)°], so that their carbonyl O atoms are on the other side of, and closer to the central plane, with distances from the plane of 1.743 (4) and 1.206 (4) Å. One benzoate group is disordered between two conformers, with occupancies of 86.9 (3) and 13.1 (3)%, related by a 143 (1)° rotation about the bond to the central benzene ring. The phenyl groups of the two conformers occupy the same space. The mol-ecule packs in the crystal with two of the three benzoate phenyl rings stacked parallel to symmetry-related counterparts, with perpendicular distances of 3.715 (5) and 3.791 (5) Å. The parallel rings are slipped away from each other, however, with centroid-centroid distances of 4.122 (2) and 4.363 (2) Å, respectively.

Structure and charge analysis of a cyclic aluminium hydride: cyclo-1,5-bis-µ-dimethylamino-3,7-di-µ-hydrido-2,4,6,8-tetrakis(dimethylaluminium).

The title compound, [Al4(CH3)8(C2H7N)2H2], crystallizes as eight-membered rings with -(CH3)2Al-(CH3)2N-(CH3)2Al- moieties connected by single hydride bridges. In the X-ray structure, the ring has a chair conformation, with the hydride H atoms being close to the plane through the four Al atoms. An optimized structure was also calculated by all-electron density functional theory (DFT) methods, which agrees with the X-ray structure but gives a somewhat different geometry for the hydride bridge. Charges on the individual atoms were determined by valence shell occupancy refinements using MoPro and also by DFT calculations analyzed by several different methods. All methods agree in assigning a positive charge to the Al atoms, negative charges to the C, N, and hydride H atoms, and small positive charges to the methyl H atoms.

catena-Poly[[[(diethyl-enetriamine-κ³N,N',N'')-copper(II)]-µ-cyanido-κ²C:N] perchlorate].

The structure of the title salt, {[Cu(CN)(C4H13N3)]ClO4}(n), is composed of copper-containing cations and perchlor-ate anions. The Cu(II) atom shows a square-pyramidal coordination, with equatorial positions occupied by the cyanide C atom [Cu-C = 1.990 (3) Å] and the N atoms of the diethyl-enetriamine ligand (average Cu-N = 2.033 Å), while the axial position is occupied by the N atom of a c-glide-related cyanide group. The axial Cu-N distance of 2.340 (3) Šis longer than the equatorial distances, reflecting Jahn-Teller distortion. The Cu(II) cations are linked by the cyanide groups into infinite chains along the c-axis direction. The refinement included a three-component disordered model for the perchlorate ion. Each minor site is stabilized by hydrogen bonds to N-H donors from four surrounding cations, while one O atom of the major perchlorate site forms hydrogen bonds to three of these cations.

[(Triethyl-ene-tetra-mine)copper(II)]-µ-cyanido-κ(2) N:C-[bis(cyanido-κC)copper(I)].

The title compound, [Cu2(CN)3(C6H18N4)] or [Cu(trien)(CN)Cu(CN)2], where trien is triethyl-ene-tetra-mine, is a mixed-valence complex crystallizing as discrete mol-ecules, with Cu(I) and Cu(II) ions linked by a bridging cyanide group. The Cu(II) ion is in a square-pyramidal coordination environment, with the N atoms of the tetra-dentate trien ligand occupying the basal positions and Cu-N bond lengths in the range 2.028 (4)-2.047 (4) Å. An N-bonded cyanide group is in the apical position, with a slightly longer Cu-N bond length of 2.127 (4) Å. The Cu(I) ion exhibits a trigonal-planar coordination geometry, bonded to the C atoms of the bridging cyanide group and two terminal cyanide groups with Cu-C bond lengths in the range 1.925 (4)-1.948 (5) Å. In the crystal, hydrogen bonding involving the tertiary N-H groups of the trien ligand and N atoms of symmetry-related terminal cyanide groups links mol-ecules into a ribbon extending in the b-axis direction.

[Sulfonyl-bis-(bromo-methyl-ene)]di-benzene.

The title compound, C14H12Br2O2S, crystallizes as the meso isomer of a diastereoisomeric pair. This structure determination was key to determining that the 1,3 elimination of bromine by tri-phenyl-phosphine occurs with inversion of the configuration at each of the two chiral carbon atoms. In the crystal, the molecules are linked by weak C-H⋯O and C-H⋯Br hydrogen bonds.

trans-Carbonyl-chlorido-bis-(tri-ethyl-phosphane-κP)platinum(II) tetra-fluorido-borate.

The chemical formulation of the title compound was established as trans-[PtCl{P(C2H5)3(CO)}BF4 by single-crystal X-ray analysis, in contrast to the five-coordinate tetra-fluoro-ethyl-ene complex that had been anti-cipated. The compound had been prepared by reaction of trans-PtHCl(P(C2H5)3)2 with C2F4 in the absence of air, and the presence of the carbonyl group was not suspected. The square-planar cations and BF4 - anions are linked by C-H⋯F and C-H⋯O inter-actions into thick wavy (010) sheets. The present crystal-structure refinement is based on the original intensity data recorded in 1967.

Poly[di-ethyl-ammonium [tetra-µ2-cyanido-κ8 C:N-tricuprate(I)]], a two-dimensional network solid.

The title compound, (C4H12N)[Cu3(CN)4] n , crystallizes as a CuCN network solid, with di-ethyl-ammonium cations sandwiched between planar CuCN sheets comprised of trigonal planar and digonally coordinated CuI atoms bridged by linear CN groups to form 24-membered rings. The digonally coordinated CuI atoms and the di-ethyl-ammonium cations lie on separate crystallographic twofold rotation axes. One of the two independent CN groups has a 50:50 disordered orientation, while the other has one orientation favored due to a N-H⋯NC hydrogen bond between the di-ethyl-ammonium cation and the anionic CuCN framework. These hydrogen bonds link the sheets together into a three-dimensional network.

Synthesis, decomposition studies and crystal structure of a three-dimensional CuCN network structure with protonated N-methylethanolamine as the guest cation.

The compound poly[2-hydroxy-N-methylethan-1-aminium [µ3-cyanido-κ3C:C:N-di-µ-cyanido-κ4C:N-dicuprate(I)]], {(C3H10NO)[Cu2(CN)3]}n or [meoenH]Cu2(CN)3, crystallizes in the tetragonal space group P43. The structure consists of a three-dimensional (3D) anionic CuICN network with noncoordinated protonated N-methylethanolamine cations providing charge neutrality. Pairs of cuprophilic Cu atoms are bridged by the C atoms of µ3-cyanide ligands, which link these units into a 43 spiral along the c axis. The spirals are linked together into a 3D anionic network by the two other cyanide groups. The cationic moieties are linked into their own 43 spiral via N-H...O and O-H...O hydrogen bonds, and the cations interact with the 3D network via an unusual pair of N-H...N hydrogen bonds to one of the µ2-cyanide groups. Thermogravimetric analysis indicates an initial loss of the base cation and one cyanide as HCN at temperatures in the range 130-250 °C to form CuCN. We show how loss of a specific cyanide group from the 3D CuCN structure could form the linear CuCN structure. Further heating leaves a residue of elemental copper, isolated as the oxide.

Crystal structures of two nickel(II) macrocyclic salts: (5,7,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-deca-ne)nickel(II) bis-(perchlorate) monohydrate and (5,7,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-deca-ne)nickel(II) dibromide trihydrate.

The crystal structure of the Ni-14 macrocycle salt, (5,7,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-deca-ne)nickel(II) bis-(perchlorate) hemihydrate, [Ni(C16H36N4)]2(ClO4)4·H2O, contains two different diasteriomeric macrocyclic cations in the asymmetric unit, one with two NH protons on each side of the cation (Ia), and the other with all four NH protons on the same side (Ib). The crystal structure of the bromide trihydrate salt of the same Ni-14 macrocyclic cation, namely (5,7,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-deca-ne)nickel(II) dibromide trihydrate, [Ni(C16H36N4)]Br2·3H2O (II), contains only the same diastereomer as Ib, with the four N-H bonds on the same side. The geometry around the Ni atom differs slightly between the two diastereomeric cations, as the mean Ni-N distance in Ia is 1.952 (2) Å, while that for Ib and II is 1.928 (2) Å. The hexa-methyl substitution in all three macrocyclic cations has the two dimethyl-substituted C atoms cis to one another, different from the trans 5,5,7,12,12,14-hexa-methyl Ni-14 cations found in all but one of the many published crystal structures of hexa-methyl Ni-14 macrocycles. In each of the two crystal structures, the anions, water mol-ecules, and N-H protons of the macrocyclic cations form extensive hydrogen-bonded zigzag chains propagating along [001] in I and [010] in II.

Crystal structure of fac-bis-[bis-(pyridin-2-yl)methan-amine]-iron(II) 1,1,3,3-tetra-cyano-2-(di-cyano-methyl-idene)propane-1,3-diide, [Fe(dipa)2](tcpd).

In the title compound, [Fe(C11H11N3)2](C10N6), the FeII cation is coordinated by two bis(pyridin-2-yl)methanamine (dipa) ligands and has crystallographic twofold symmetry. There are deviations from ideal octa-hedral geometry due to the steric requirements of the ligands. The polynitrile 1,1,3,3-tetra-cyano-2-(di-cyano-methylid-ene)propane-1,3-diide (tcpd2-) dianion is disordered about an inversion center and is not coordinated to the Fe atom. The anion is not planar but has a propeller shape. In the crystal, weak N-H⋯N inter-actions between the amine H atoms of the dipa ligands and two nitrile groups of the anion form an alternating chain of cations and anions related by the C-centering of the unit cell.

Crystal structures of two mixed-valence copper cyanide complexes with N-methyl-ethylenedi-amine.

The crystal structures of two mixed-valence copper cyanide compounds involving N-methyl-ethylenedi-amine (meen), are described. In compound (I), poly[bis(µ3-cyanido-κ3C:C:N)tris(µ2-cyanido-κ2C:N)bis(N-methylethane-1,2-di-amine-κ2N,N')tricopper(I)copper(II)], [Cu4(CN)5(C3H10N2)2] or Cu4(CN)5meen2, cyanide groups link CuI atoms into a three-dimensional network containing open channels parallel to the b axis. In the network, two tetra-hedrally bound CuI atoms are bonded by the C atoms of two end-on bridging CN groups to form Cu2(CN)6 moieties with the Cu atoms in close contact at 2.560 (1) Å. Other trigonally bound CuI atoms link these units together to form the network. The CuII atoms, coordinated by two meen units, are covalently linked to the network via a cyanide bridge, and project into the open network channels. In the mol-ecular compound (II), [(N-methylethylenediamine-κ2N,N')copper(II)]-µ2-cyanido-κ2C:N-[bis(cyanido-κC)copper(I)] monohydrate, [Cu2(CN)3(C3H10N2)2]·H2O or Cu2(CN)3meen2·H2O, a CN group connects a CuII atom coordinated by two meen groups with a trigonal-planar CuI atom coordinated by CN groups. The mol-ecules are linked into centrosymmetric dimers via hydrogen bonds to two water mol-ecules. In both compounds, the bridging cyanide between the CuII and CuI atoms has the N atom bonded to CuII and the C atom bonded to CuI, and the CuII atoms are in a square-pyramidal coordination.