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Sökning: WFRF:(Abu Youssef Morsy A.M.) > (2005-2009)

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1.
  • Abu-Youssef, Morsy A.M., et al. (författare)
  • 1D, 2D and 3D cadmium(II) polymeric complexes with quinoline-4-carboxylato anion, quinazoline and 2,5-dimethylpyrazine
  • 2006
  • Ingår i: Polyhedron. - : Elsevier BV. - 0277-5387. ; 25:5, s. 1187-1194
  • Tidskriftsartikel (refereegranskat)abstract
    • Three new cadmium(II) complexes, namely [Cd(Qux)2(H2O)]n (1), [Cd(Quz)2(N3)2]n (2) and [Cd(dmpz)(N3)2]n (3) (Qux = quinoline-4-carboxylato anion, Quz = quinazoline, dmpz = 2,5-dimethylpyrazine), have been synthesized and characterized by spectroscopic and crystallographic methods. The structure of 1 contains CdO6 slightly distorted octahedral geometry around the Cd(II) atoms, axialy coordinated to two bridging water molecules forming the 1D chain and four oxygen atoms from four different μ-O,O′-bridging caboxylato groups of (Qux) in the equatorial plane. The 1D chains are further held together through hydrogen bonds between the μ-aqua molecule and the meta non-coordinated nitrogen atom of the quinoline moiety. In complex 2, two quinazoline ligands are linked to the central Cd(II) ion in a trans position through the meta hetero nitrogen atom and di(EE), (μ1,3-N3) groups and show a two dimensional (2D) topology. In complex 3 the central cadmium(II) atom is simultaneously coordinated to di(EE), (μ1,3-N3) groups (NCdN, 180.0°) forming a sheet structure in the bc plane and further bridging μ-N,N′-dimethylpyrazine ligand in the a-direction (NCdN, 180.0°) giving rise to a 3D network structure. The IR spectra of the three complexes were measured and they confirm the X-ray structural data.
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2.
  • Abu-Youssef, Morsy A.M., et al. (författare)
  • 1D and 2D FeII Azide Coordination Polymers with Ferromagnetic Canting
  • 2008
  • Ingår i: European Journal of Inorganic Chemistry. - : Wiley. - 1434-1948 .- 1099-0682. ; 2008:1, s. 112-118
  • Tidskriftsartikel (refereegranskat)abstract
    • The two compounds [FeII(pyridine)2(N3)2(H2O)] (1) and [FeII(4-acetylpyridine)2(N3)2] (2) were prepared. The X-ray crystal structures show end-to-end (EE) bridging azides in both cases with a 1D Fe-NNN-Fe chain for 1 and a 2D Fe-NNN-Fe net in 2. Both compounds show similar magnetic behaviour where the high-temperature data are consistent with antiferromagnetic couplings and the low-temperature data indicate ferrimagnetic ordering based on spin canting at 20 and 45 K. Compound 2 also shows a hysteresis loop. These findings are compared to the related 3D coordination polymer [Fe(N3)2(4,4'-bipyridine)]. According to network analyses the latter compound was shown to contain the new uninodal six-connected-network topology (510 · 64 · 7)-jsm.
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3.
  • Abu-Youssef, Morsy A.M., et al. (författare)
  • A unique example of a high symmetry three- and four-connected hydrogen bonded 3D-network
  • 2006
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1364-548X .- 1359-7345. ; 2006:10, s. 1082-1084
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a three- and four-connected 3D-net based on 4-aminopyridine coordinated to Ag(I) and hydrogen bonded to nitrate with the unusual, high symmetry, topology (83)(86)2-tfa.
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6.
  • Abu-Youssef, Morsy A. M., et al. (författare)
  • New homogeneous and alternating Mn(II)-azido 1D systems
  • 2005
  • Ingår i: Polyhedron. - : Elsevier BV. - 0277-5387. ; 24:4, s. 557-562
  • Tidskriftsartikel (refereegranskat)abstract
    • Reaction of sodium azide with manganese(II) and 4-amino-1,2,4-triazol or 3-chloropyridine leads to the 1D systems [Mn(N-3)(2) (4-amtr)(2)](,) (1) or {[Mn(N-3)(2)(3-Clpy)(2)]center dot 1/2(3-Clpy)}(n) (2), respectively. Compound 1 crystallises in the C2/m (monoclinic) group and consists of chains of Mn(II) cations bridged by double mu(1,3)-azido bridges in trans arrangement. Compound 2 crystallises in the I2/a (monoclinic) group and in this case the 1D system shows alternating double mu(1,1) and mu(1,3) bridges. Magnetic properties follow the expected antiferromagnetic (compound 1) and alternating ferro-antiferromagnetic (compound 2) behaviour. (c) 2005 Published by Elsevier Ltd.
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7.
  • Abu-Youssef, Morsy A. M., et al. (författare)
  • New Polymeric Manganese Azide Derivatives with Quinazoline
  • 2005
  • Ingår i: European Journal of Inorganic Chemistry. - 1434-1948 .- 1099-0682. ; 2005:22, s. 4659 - 4664
  • Tidskriftsartikel (refereegranskat)abstract
    • Two new polymeric derivatives of the (azido)MnII system with formula [Mn(H2O)(μ-N3)(N3)(quinaz)2]n (1) and [Mn(μ-N3)2(quinaz)2]n (2) (quinaz = quinazoline) have been structurally and magnetically characterised. Compound 1 crystallises in the triclinic system, space group P-1, and consists of 1D chains with single end-to-end azido bridges. These chains give a two-dimensional supramolecular arrangement by means of H-bond interactions. Compound 2 crystallises in the monoclinic system, space group C2/c, and contains a square alternating 2D network bridged by azido ligands in the end-to-end coordination mode. Compound 2 exhibits some unusual features, such as the unprecedented linear coordination of the azido bridge. Magnetic analysis reveals moderate antiferromagnetic coupling, with J values in good agreement with the expected range, as a function of the Mn-N-N bond angles.
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8.
  • Abu-Youssef, Morsy A.M., et al. (författare)
  • Synthesis, a case of isostructural packing, and antimicrobial activity of silver(I)quinoxaline nitrate, silver(I)(2,5-dimethylpyrazine) nitrate and two related silver aminopyridine compounds
  • 2006
  • Ingår i: Dalton Transactions. - : Royal Society of Chemistry (RSC). - 1477-9226 .- 1477-9234. ; 2006:21, s. 2542-2550
  • Tidskriftsartikel (refereegranskat)abstract
    • The synthesis and low temperature crystal structures of [Ag(quinoxaline)]n(NO3)n, 1, [Ag(2,5-dimethylpyrazine)(NO3)]n, 2 and [Ag4(3-aminopyridine)4(NO3)4]n 3 are presented. The quinoxaline compound forms a 1D coordination polymer with the characteristic linear 2-coordination figure of silver(I), the NAgN angle being 164.2(1)°, and only weak silvernitrate interactions. In addition there is an interaction giving pairs of parallel chains as the main structural theme. The 2,5-dimethylpyrazine compound has approximately trigonal-planar coordination, also binding one nitrate at the relatively short AgO distances 2.444(3)Å and 2.484(3)Å, respectively, for the two crystallographically different silver atoms. This also results in a 1D coordination polymer that, despite the large differences in the Ag(I) coordination environment, is isostructural with 1. [Ag4(3-aminopyridine)4(NO3)4]n 3 forms a 2D coordination polymer by bridging nitrate ions. The antimicrobial activity of 13, and also of [Ag3(2-aminopyridine)4](NO3)3, 4 was screened for 13 different pathogens and substantial activity was shown for 1 against Escherichia coli and Pseudomonas aeruginosa (MIC 4 µg cm3) and somewhat lower activity was registered against Sarcina lutea and Salmonella typhi for 1, Bordetella bronchiseptica for 2, Salmonella typhi and Pseudomonas aeruginosa for 3, and Escherichia coli and Shigella sonnie for 3 (MIC 8 µg cm3). Only low activity was shown against the yeast Candida albicans for 1, 2 and 4 whereas no activity against this pathogen was registered for 3.
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9.
  • Abu-Youssef, Morsy A.M., et al. (författare)
  • Synthesis and Structure of Silver Complexes with Nicotinate-Type Ligands Having Antibacterial Activities against Clinically Isolated Antibiotic Resistant Pathogens
  • 2007
  • Ingår i: Inorganic Chemistry. - : American Chemical Society (ACS). - 0020-1669 .- 1520-510X. ; 46:15, s. 5893-5903
  • Tidskriftsartikel (refereegranskat)abstract
    • The synthesis and low-temperature X-ray crystal structures of five new silver complexes, [Ag2-μ-O,O'(2-aminonicotinium)2(NO3)2]n (7), [Ag(isonicotinamide)2-μ-O,O'(NO3)]2 (8), [Ag(ethyl nicotinate)2](NO3) (9), [Ag(ethyl isonicotinate)2(NO3)] (10), and [Ag(methyl isonicotinate)2(H2O)](NO3) (11), are presented and fully characterized by spectral and elemental analysis. The antimicrobial activities of these complexes were screened using 12 different clinical isolates belonging to four pathogenic bacteria, S. aureus, S. pyogenes, P. mirabilis, and Ps. Aeruginosa, all obtained from diabetic foot ulcers. These tested bacteria were resistant for at least 10 antibiotics commonly used for treatment of diabetic foot ulcers. Compounds 7 and 8 had considerable activity against Ps. Aeruginosa (MIC values 2-8 µg/mL), compound 9 against S. aureus (MIC 4-16 µg/mL) and S. pyogenes (MIC 2-4 µg/mL), and also 9 and 11 against P. mirabilis (MIC 1-16 µg/mL). All complexes were non-toxic for daphnia at concentrations above 512 µg/mL overnight.
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10.
  • Abu-Youssef, Morsy A.M., et al. (författare)
  • Synthesis, Structure, and Magnetic Behavior of Two New 1D Polymeric Manganese Azido Complexes
  • 2006
  • Ingår i: European Journal of Inorganic Chemistry. ; 2006:16, s. 3177-3184
  • Tidskriftsartikel (refereegranskat)abstract
    • Two new MnII one-dimensional compounds with formulae [Mn(μ-N3)2(pyzamid)2]n (1) and [Mn2(3-ampy)4(μ-N3)2(N3)2(H2O)2]n, (2) (pyzamid = pyrazineamide and 3-ampy = 3-aminopyridine) were structurally and magnetically characterized. Compound 1 crystallizes in the monoclinic system, P2/c space group, and polymerizes through double end-on azido bridges giving 1D chains with the MnII atoms in a MnN6 environment. Compound 2 crystallizes in the triclinic system, P-1 space group, and consists of alternate [Mn(3-ampy)2(μ-N3)2(N3)2] and [Mn(3-ampy)2(μ-N3)2(H2O)2] octahedrons (MnN6 - MnN4O2 environments), linked by single end-to-end azido bridges. Both chains show very uncommon topologies. Attemps to obtain manganese/azido derivatives with the qux = quinoline-4-carboxylato anion gave the recently reported compound [Mn(μ-qux)2(μ-H2O)]n (3), which consists of a chain with only carboxylato and aqua bridges with the MnII atoms in a MnO6 slightly distorted octahedron. In good agreement with the expected behavior, magnetic susceptibility measurements show weak ferromagnetic interactions for 1, whereas compound 2 exhibits moderate antiferromagnetic coupling.
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11.
  • Abu-Youssef, Morsy A. M., et al. (författare)
  • Synthesis, structure, network and thermal analysis of four 5-(pyrazinyl)tetrazolato copper(II) and cobalt(II) complexes
  • 2007
  • Ingår i: Polyhedron. - : Elsevier BV. - 0277-5387. ; 26:7, s. 1531-1540
  • Tidskriftsartikel (refereegranskat)abstract
    • Three new copper complexes and one cobalt complex with 5-(pyrazinyl)tetrazolate anion, (pyztz)(-), as chelating bidentate ligand, were obtained by the reaction of pyrazinecarbonitrile with sodium azide in the presence of copper(II) nitrate or cobalt(II)chloride. Complexes of composition [Cu(pyztz)(2)(H2O)] (1) deep blue crystals, [Cu(pyztz)(2)(H2O)(2)] (2a) green crystals, [Co(pyztz)(2)(H2O)(2)] (2b) orange crystals, [Cu(pyztz)2(H2O)(2)] center dot (H2O) (3) blue crystals were obtained. The single crystal X-ray diffraction revealed that complex I has square pyramidal structure with one water molecule at apical and two pyrazine-tetrazolato ligands at basal sites, while structures of 2a, 2b and 3 consist of octahedrally coordinated metal ions, where two pyztz anions act as bidentate ligands via one of the pyrazine-N atoms and one of the tetrazole-N atoms in trans-positions and two trans water molecules. Complex 3 contains one extra lattice water molecule. Hydrogen bonds of the types O-H center dot center dot center dot O and O-H center dot center dot center dot N connect the mononuclear units to a three-dimensional network structure in 2 (a and b are isostructural) and 3. Although the H-bond patterns look complex it is shown that they can be related to the well-known three- and six-connected rutile net (rtl) in 2 and the four- and six-connected fsh-net in 3. (C) 2006 Elsevier Ltd. All rights reserved.
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12.
  • Ghazzali, Mohamed I D M, 1974, et al. (författare)
  • 4,4'-(Azinodimethylene)dipyridinium bis(tetrafluoroborate) and 4-[(4-pyridylmethylene)hydrazonomethyl]pyridinium perchlorate: two different hydrogen-bonding motifs
  • 2007
  • Ingår i: Acta Crystallographica Section C: Crystal Structure Communications. - 0108-2701 .- 1600-5759. ; C63:5, s. o312-o314
  • Tidskriftsartikel (refereegranskat)abstract
    • In the crystal structures of the title compounds, C12H12N42+·2BF4-, (I), and C12H11N4+·ClO4-, (II), respectively, infinite two- and one-dimensional architectures are built up via N-H...F [in (I)] and conventional N-H...N [in (II)] hydrogen bonding. The N-N single bond in (I) lies on a crystallographic centre of symmetry; as a result, the two pyridinium rings are parallel. In (II), the pyridinium and pyridyl ring planes are inclined with a dihedral angle of 14.45(3)°.
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13.
  • Ghazzali, Mohamed I D M, 1974, et al. (författare)
  • catena-Poly[[chloro(pyridinium-3-carboxylato-κO)zinc(II)]-μ-nicotinato-κ2O:N]
  • 2007
  • Ingår i: Acta Crystallographica Section E: Structure Reports Online. - 1600-5368. ; E63:1, s. m114-m116
  • Tidskriftsartikel (refereegranskat)abstract
    • The title bis-nicotinate zinc chloride, [Zn(C6H4NO2)Cl(C6H5NO2)]n, has an infinite head-to-tail one-dimensional chain structure. The compound was synthesized under mild hydrothermal conditions. The ZnII atom exhibits a distorted tetrahedral coordination geometry. The structure is statistically disordered, with 0.5 site occupancy for the Zn atom and the H atom located on the pyridine N atom. As a result, Zn positions in the crystal structure alternate between two sites related by a crystallographic twofold axis and rows of molecules are formed, supported by strong N-H...O hydrogen bonds.
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14.
  • Ghazzali, Mohamed I D M, 1974, et al. (författare)
  • Synthesis, EPR and DFT calculations of rare Ag(II)porphyrins and the crystal structure of [Zn(II)tetrakis(4-bromo-2-thiophene)porphyrin]
  • 2008
  • Ingår i: Inorganic Chemistry Communication. - : Elsevier BV. - 1387-7003 .- 1879-0259. ; 11:9, s. 1019-1022
  • Tidskriftsartikel (refereegranskat)abstract
    • Meso-tetrakis (4-bromo-2-thiophene) and (5-bromo-2-thiophene) porphyrins were synthesized in 18% yield from freshly distilled pyrrole and the corresponding aldehydes in refluxing propionic acid. Reaction of both porphyrins with either Zn(OAc) 2 · 2H 2 O or Ag(OAc) afforded the corresponding metal complexes in 20% yield. The free bases and metal complexes were characterized by IR, NMR, EPR, MS and XPS. The crystal structure of 5,10,15,20(4-bromo-2-thiophene)porphyrinato Zn(II) was determined by X-ray diffraction and shows a 'zigzag-like' packing pattern due to S···S intermolecular interaction. Structural features of these molecules are discussed by DFT quantum chemical calculations. © 2008 Elsevier B.V. All rights reserved.
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15.
  • Massoud, Al-Shimaà A A, 1980, et al. (författare)
  • Bis[4-(dimethylamino)pyridine-κN1]silver(I) nitrate dihydrate
  • 2009
  • Ingår i: Acta Crystallographica Section C: Crystal Structure Communications. - 0108-2701 .- 1600-5759. ; C65:9, s. m352-m354
  • Tidskriftsartikel (refereegranskat)abstract
    • The title compound, [Ag(C7H10N2)2]NO3·2H2O or [Ag(dmap)2]NO3·2H2O, where dmap is 4-(dimethylamino)pyridine, has a distorted linear coordination geometry around the AgI ion. A novel pattern of water-nitrate hydrogen-bonded anionic strands is formed in the c direction, with the cationic [Ag(dmap)2]+ monomers trapped between them. The AgI ion and the nitrate group atoms, as well as the water molecules (including the H atoms), are on a crystallographic mirror plane (Wyckoff position 4a). The influence of bulky methyl substituents in position 4 of the 4-(dimethylamino)pyridine ligand on packing is discussed. The absolute structure was determined unequivocally.
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16.
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17.
  • Massoud, Al-Shimaà A A, 1980, et al. (författare)
  • Synthesis, X-ray structure and anti-corrosion activity of two silver(I) pyrazino complexes
  • 2009
  • Ingår i: Polyhedron. - : Elsevier BV. - 0277-5387. ; 28:13, s. 2794-2802
  • Tidskriftsartikel (refereegranskat)abstract
    • Two new silver(I) pyrazine complexes [Ag2(ampyz)(NO3)2]n, 1 and {[Ag(2,3-pyzdic)](NO3)}n, 2 (where ampyz = aminopyrazine, and 2,3-pyzdic = 2,3-pyrazinedicarboxamide) were synthesized and structurally characterized by X-ray single crystal structure analysis. Complex 1 has a 2D sheet structure through both bridging μO,O′-(NO3) groups and μN,N′-pyrazine moieties. A 3D structure with a characteristic (10,3)-d or 103-utp net is formed through extensive hydrogen bonding. Complex 2 has a 1D chain structure through bridging μN,N′-pyrazine moieties. Strong hydrogen bonds further connect these chains to extend the dimensionality to a 3D network structure. The complexes were tested as corrosion inhibitors for mild steel in 0.1 M nitric acid medium using potentiodynamic polarization technique. Both complexes are of mixed type corrosion inhibitors with dominant anodic effect. The inhibition efficiencies are 68% and 50% for complexes 1 and 2, respectively. The inhibition mechanisms of both inhibitors are mainly due to adsorption of the inhibitor molecules on the surface of mild steel. All data were compared and fitted to the kinetic-thermodynamic model. The binding constants K are 3263 and 1147 for complexes 1 and 2, respectively.
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18.
  • Massoud, Al-Shimaà A A, 1980, et al. (författare)
  • Two 2-D copper(II) azido compounds: catena-poly[di-μ1,1- azido,di-μN,O-(quinolinecarboxylato)(aqua)copper(II)] and 1-D catena-poly[di-μN,N'-(quinoxaline)copper(II)nitrate]
  • 2009
  • Ingår i: Journal of Coordination Chemistry. - : Informa UK Limited. - 0095-8972 .- 1029-0389. ; 62:4, s. 519-530
  • Tidskriftsartikel (refereegranskat)abstract
    • We synthesized three copper(II) complexes with two structurally related polydentate ligands,quinoline-4-carboxylic acid (quCOOH) and quinoxaline (qux). The structures of these complexes were determined using X-ray single crystal crystallography. Complex 1,[Cu(quCOO)(N3)(H2O)]n, has a 2-D polymeric structure through di-μ1,1 azido groups forming (Cu2N2) dimeric units and di-μN,O quinoline carboxylate bridging the binuclear copper units.[Cu(quCOO)(N3)(H2O)]n . 0.87MeOH, (2), has the same structure as 1 in addition to MeOH molecules separating the 2-D sheets of [Cu(quCOO)(N3)(H2O)]n. [Cu(qux)(NO3)2]n, (3), has nocoordinated azido groups, but the quinoxaline is a bidentate bridging ligand giving a 1-D chain,while the μO,O' chelating nitrato groups stabilize the chain structure by forming a square planarcoordination sphere around copper. IR and UV–Vis spectra of the complexes are in agreementwith the crystal structures.
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19.
  • Mautner, F. A., et al. (författare)
  • 1D and 3D coordination polymers with the M(mu(1),mu(1)-X)(2)M motif (M = Na, Zn, Cd): Observation of a linear [Na(H2O)(4)](n)(n+) cation and a five-connected sqp-net
  • 2007
  • Ingår i: Polyhedron. - : Elsevier BV. - 0277-5387. ; 26:12, s. 2703-2712
  • Tidskriftsartikel (refereegranskat)abstract
    • Three polymeric complexes [Zn(pydz)(N-3)(SO4)](n)[Na(H2O)(4)](n)(H2O)(4n) (1), [Cd(3-ampy)(N-3)Cl](n) (2), and [Cd(DENA)Cl-2(H2O)](n)(3), (pydz = pyridazine or 1,2-diazine, 3-ampy = 3-aminopyridine, DENA = NN-diethylnicotineamide) have been synthesized and characterized by spectral and structural methods and their network topologies analysed. Complex 1 crystallizes in monoclinic C-centred space group C2/m, the Zn(1) center is octahedrally coordinated; and simultaneously bridged by EO-azido, NN'-pydz, and O,O'-sulphato ligands. The ZnN4O2-octahedra form a ID anionic chain along b-axis. The Na(OH2)(6)-octahedra have also common water molecules, thus also forming a 1D chain along b-axis. The cationic and anionic chains are connected via hydrogen bonds of type O-H...O including lattice water molecules to form a supramolecular 3D network structure. In complex 2, the Cd(1) is six-coordinated by two EE-bridging azide groups, and two nitrogen atoms of bridging NN', 3-ampy ligand, and two bridging chloro ligands. The three different bridging ligands connect the distorted octahedra of the Cd(II) centres to form a 3D network structure with the topology of a square pyramidal net (4(3) (.) 6(6)-sqp). The centrosymmetric Cd2Cl2-rings are planar and the NH2- of the 3-ampy groups forms additional hydrogen bonds of type N-H...N to the adjacent azido groups. In complex 3, the octahedrally coordinated Cd(1) centres are occupied by alternating monodentate DENA ligand and a water molecule and the other four sites are occupied by four bridging chloro ligands. Thus the Cd2Cl2-rings form common edges to form 1D chains of Cd(II) octahedra along the b-axis of the monoclinic unit cell. 2D supramolecular sheets extended along the bc-planes of the unit cell are formed by the 0-H...O hydrogen bond. The IR spectra of the three complexes were measured and they confirm the X-ray structural data. (C) 2007 Elsevier Ltd. All rights reserved.
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