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Adjacent Chains (adjacent + chain)
Selected AbstractsPoly[[diaqua(,3 -3-nitrophthalato)calcium(II)] monohydrate]ACTA CRYSTALLOGRAPHICA SECTION C, Issue 10 2009Ming-Lin Guo The title 3-nitrophthalate,calcium coordination polymer, {[Ca(C8H3NO6)(H2O)2]·H2O}n, crystallizes as a one-dimensional framework. The CaII centre has a distorted pentagonal,bipyramidal geometry, being seven-coordinated by five O atoms from three different 3-nitrophthalate groups and by two water molecules, resulting in a one-dimensional zigzag chain along the a -axis direction by the interconnection of the four O atoms from the two carboxylate groups. There is a D3 water cluster composed of the coordinated and the solvent water molecules within such chains. Adjacent chains are aggregated into two-dimensional layers via hydrogen bonds in the c -axis direction. The whole three-dimensional structure is further stabilized by weak O,H...O hydrogen bonds between the O atoms of the nitro group and the water molecules. [source] Hydrogen-bond-directed supramolecular arrays in 4,4,-bipyridinium tetrachloroterephthalate dihydrate and bis(1,10-phenanthrolinium) tetrachloroterephthalate tetrachloroterephthalic acid trihydrateACTA CRYSTALLOGRAPHICA SECTION C, Issue 10 2009Ming-Yang He The title compounds, C10H10N22+·C8Cl4O42,·2H2O, (I), and 2C12H9N2+·C8Cl4O42,·C8H2Cl4O4·3H2O, (II), both crystallize as charge-transfer organic salts with the dianionic or neutral acid components lying on inversion centres. The acid and base subunits in (I) arrange alternately to generate a linear tape motif via N,H...O hydrogen bonds; these tapes are further combined into a three-dimensional architecture through multiple O,H...O and C,H...O interactions involving solvent water molecules. In contrast, the neutral and anionic acid components in (II) are linked to form a zigzag chain by means of O,H...O hydrogen bonds between acid groups, with dangling 1,10-phenanthrolinium units connected to these chains by carboxylate,pyridinium interactions with R22(7) hydrogen-bond notation. Adjacent chains are further extended to result in a two-dimensional corrugated layer network via,,, interactions. Inter-ion Cl...O interactions are also found in both (I) and (II). [source] A one-dimensional nickel(II) coordination polymer containing 2,6-dipicolinate and dipyrido[3,2- a:2,,3,- c]phenazineACTA CRYSTALLOGRAPHICA SECTION C, Issue 12 2007Yi Ma A new coordination polymer, catena -poly[[(dipyrido[3,2- a:2,,3,- c]phenazine-,2N,N,)nickel(II)]-,-2,6-dipicolinato-,4O2,N,O6:O2,], [Ni(C7H3NO4)(C18H10N4)]n, exhibits a one-dimensional structure in which 2,6-dipicolinate acts as a bridging ligand interconnecting adjacent nickel(II) centers to form a chain structure. The asymmetric unit contains one NiII center, one dipyrido[3,2- a:2,,3,- c]phenazine ligand and one 2,6-dipicolinate ligand. Each NiII center is six-coordinated and surrounded by three N atoms and three O atoms from one dipyrido[3,2- a:2,,3,- c]phenazine ligand and two different 2,6-dipicolinate ligands, leading to a distorted octahedral geometry. Adjacent chains are linked by ,,, stacking interactions and weak interactions to form a three-dimensional supramolecular network. [source] catena -Poly[[[triaquasulfatocobalt(II)]-,-4,4,-bipyridine] ethane-1,2-diol solvate]ACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2006Wen-Jie Lu In the title compound, {[Co(SO4)(C10H8N2)(H2O)3]·C2H6O2}n, each CoII center is octahedrally coordinated by two N atoms from two bridging 4,4,-bipyridine (bipy) ligands and four O atoms, one from a monodentate sulfate ligand and three from aqua ligands. The bipy ligands occupy special positions of site symmetry and bridge adjacent cobalt(II) centers to form one-dimensional linear coordination chains. Adjacent chains are arranged in a cross-like fashion around the mid-point of the bipy ligands, resulting in a three-dimensional supramolecular array. [source] Syntheses, Spectroscopic Studies, and Crystal Structures of Chiral [Rh(aminocarboxylato)(,4 -cod)] and Chiral [Rh(amino alcohol)(,4 -cod)](acetate) Complexes with an Example of a Spontaneous Resolution of a Racemic Mixture into Homochiral Helix-EnantiomersEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 11 2006Mohammed Enamullah Abstract The dimeric complex acetato(,4 -cycloocta-1,5-diene)rhodium(I), [Rh(O2CMe)(,4 -cod)]2 (cod = cycloocta-1,5-diene), reacts with amino acids [HAA = L -alanine, (S)-2-amino-2-phenylacetic acid (L -phenylglycine), N -methylglycine, and N -phenylglycine] and with the amino alcohol (S)-2-amino-2-phenylethanol to afford the aminocarboxylato(,4 -cycloocta-1,5-diene)rhodium(I) complexes [Rh(AA)(,4 -cod)] (AA = deprotonated amino acid = aminocarboxylato ligand) and [(S)-2-amino-2-phenylethanol](,4 -cycloocta-1,5-diene)rhodium(I) acetate, [Rh{(S)-HOCH2,CH(Ph)-NH2}(,4 -cod)](O2CMe) (V). The complexes are characterized by IR, UV/Vis, 1H/13C NMR and mass spectroscopy. The achiral N -phenylglycine ligand gives a chiral N -phenylglycinato complex [Rh(O2C,CH2,NHPh)(,4 -cod)] (IV) with the amine nitrogen atom becoming the stereogenic center upon metal coordination. Complex IV crystallizes in the tetragonal, chiral space group P43 and the crystal structure reveals twofold spontaneous resolution of a racemic mixture into homochiral helix-enantiomers. The investigated crystal contained only one type of helix, namely (left-handed or M- ) 43 -helical chains. This is traced first to an intermolecular N,H···O hydrogen bonding from the stereogenic amino group to a neighboring unligated carboxyl oxygen atom that connects only molecules of the same (R)-configuration into (left-handed or M- ) 43 -helical chains. This intrachain homochirality is supplemented, secondly, by the interlocking of adjacent chains with their corrugated van der Waals surface to allow for an interchain transmission of the sense of helicity, building the single crystal from the same homochiral helix-enantiomer. The enantiomeric amino alcohol complex V crystallizes in the monoclinic, noncentrosymmetric (Sohncke) space group P21. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source] The crystal structure of perdeuterated methanol hemiammoniate (CD3OD·0.5ND3) determined from neutron powder diffraction data at 4.2 and 180,KJOURNAL OF APPLIED CRYSTALLOGRAPHY, Issue 2 2010A. D. Fortes The crystal structure of perdeuterated methanol hemiammoniate, CD3OD·0.5ND3, has been solved from neutron powder diffraction data collected at 4.2 and 180,K. The structure is orthorhombic, space group Pn21a (Z = 4), with unit-cell dimensions a = 12.70615,(16), b = 8.84589,(9), c = 4.73876,(4),Å, V = 532.623,(8),Å3 [,calc = 1149.57,(2),kg,m,3] at 4.2,K, and a = 12.90413,(16), b = 8.96975,(8), c = 4.79198,(4),Å, V = 554.656,(7),Å3 [,calc = 1103.90,(1),kg,m,3] at 180,K. The crystal structure was determined by ab initio methods from the powder data; atomic coordinates and isotropic displacement parameters were subsequently refined by the Rietveld method to Rp, 2% at both temperatures. The crystal structure comprises a three-dimensionally hydrogen-bonded network in which the ND3 molecules are tetrahedrally coordinated by the hydroxy moieties of the methanol molecule. This connectivity leads to the formation of zigzag chains of ammonia,hydroxy groups extending along the c axis, formed via N,D···O hydrogen bonds; these chains are cross-linked along the a axis through the hydroxy moiety of the second methanol molecule via N,D···O and O,D···O hydrogen bonds. This `bridging' hydroxy group in turn donates an O,D···N hydrogen bond to ammonia in adjacent chains stacked along the b axis. The methyl deuterons in methanol hemiammoniate, unlike those in methanol monoammoniate, do not participate in hydrogen bonding and reveal evidence of orientational disorder at 180,K. The relative volume change on warming from 4.2 to 180,K, ,V/V, is + 4.14%, which is comparable to, but more nearly isotropic (as determined from the relative change in axial lengths, e.g.,a/a) than, that observed in deuterated methanol monohydrate, and very similar to what is observed in methanol monoammoniate. [source] A new chain structure: catena -poly[4,4,-(ethane-1,2-diyl)dipyridinium bis[[aquadifluoridooxidovanadate]-,-fluorido]]ACTA CRYSTALLOGRAPHICA SECTION C, Issue 5 2010David W. Aldous The title compound, {(C12H12N2)[V2F6O2(H2O)2]}n, features a novel extended-chain moiety, [VOF2F2/2(H2O)]n, comprising trans vertex-connected VOF4(H2O) octahedra. The octahedra themselves show the characteristic distortion due to the off-centring of the V4+ ion, such that a short terminal V=O bond and an elongated trans V,OH2 bond are present. Hydrogen bonding from the water molecules to terminal F atoms in adjacent chains generates associated chain dimers, which are loosely linked into sheets via additional hydrogen bonding involving the organic moieties. Structural relationships with previously described vanadium oxyfluoride species are briefly discussed. [source] Poly[[[aqua(2,2,-bipyridine-,2N,N,)manganese(II)]-,-croconato-,4O,O,:O,,,O,,,] monohydrate]: a one-dimensional coordination polymer connected by hydrophilic,hydrophilic and lipophilic,lipophilic interactions at 135,KACTA CRYSTALLOGRAPHICA SECTION C, Issue 4 2010Hong-Feng Chen In the title one-dimensional coordination polymer, {[Mn(C5O5)(C10H8N2)(H2O)]·H2O}n, each MnII ion is seven-coordinated by four O atoms from two croconate ligands, two N atoms from a 2,2,-bipyridine (2,2,-bipy) ligand and one O atom from an aqua ligand. The croconate ligand bridges the MnII ions in a bis-bidentate chelation mode, forming an extended [Mn(C5O5)]n chain running parallel to the [001] direction, with the lipophilic 2,2,-bipy ligands lying along one side and the hydrophilic water molecules along the opposite side. Coordinated water and solvent water molecules are arranged in the hydrophilic layer, which is characterized by O,H...O hydrogen bonds between croconate ligands. Meanwhile, 2,2,-bipy ligands from adjacent chains partially overlap and exhibit ,,, interactions to form a lipophilic layer. The hydrophilic and lipophilic layers are arranged alternately to build a layer structure. [source] catena -Poly[[aqua(11-chloropyrido[2,,3,:2,3]pyrimidino[5,6- f][1,10]phenanthroline-,2N4,N5)cadmium(II)]-,-benzene-1,4-dicarboxylato-,3O1,O1,:O4]: an inclined interpenetrating (6,3) networkACTA CRYSTALLOGRAPHICA SECTION C, Issue 12 2009Zhi-Guo Kong The asymmetric unit of the title compound, [Cd(C8H4O4)(C17H8ClN5)(H2O)]n, contains one CdII atom, two half benzene-1,4-dicarboxylate (1,4-bdc) anions, one 11-chloropyrido[2,,3,:2,3]pyrimidino[5,6- f][1,10]phenanthroline (L) ligand and one coordination water molecule. The 1,4-bdc ligands are on inversion centers at the centroids of the arene rings. The CdII atom is six-coordinated by two N atoms from one L ligand, three carboxylate O atoms from two different 1,4-bdc ligands and one water O atom in a distorted octahedral coordination sphere. Each CdII center is bridged by the 1,4-bdc dianions to give a one-dimensional chain. ,,, stacking interactions between L ligands of neighboring chains extend adjacent chains into a two-dimensional supramolecular (6,3) network. Neighboring (6,3) networks are interpenetrated in an unusual inclined mode, resulting in a three-dimensional framework. Additionally, the water,carboxylate O,H...O hydrogen bonds observed in the network consolidate the interpenetrating nets. [source] The high-pressure form of cadmium vanadate, CdV2O6ACTA CRYSTALLOGRAPHICA SECTION C, Issue 7 2007Alexei A. Belik The crystal structure of a new high-pressure modification of cadmium divanadium hexaoxide, CdV2O6, was refined from X-ray single-crystal data. It contains zigzag chains of edge-sharing VO6 octahedra. Octahedra in adjacent chains share corners and form corrugated layers. Octahedrally coordinated Cd atoms, which lie on twofold axes, are situated between the layers. The columbite-like structure results in a strong distortion of the CdO6 octahedra which may be stabilized only at high pressure. [source] catena -Poly[[silver(I)-,-hexane-1,6-diamine-,2N:N,] cinnamate dihydrate]ACTA CRYSTALLOGRAPHICA SECTION C, Issue 6 2004Zhong-Lu You The title compound, {[Ag(C6H16N2)](C9H7O2)·2H2O}n, has been synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. The Ag atom is coordinated in a linear configuration by two N atoms from two hexane-1,6-diamine ligands, giving a zigzag polymeric chain with an [,Ag,N,C,C,C,C,C,C,N,]n backbone running parallel to the c axis. In the crystal packing, adjacent chains interact with the anions via the lattice water molecules, thus forming layers parallel to the bc plane. [source] | ||||||||||