| 1. |
- Abu-Youssef, Morsy A. M., et al.
(författare)
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New homogeneous and alternating Mn(II)-azido 1D systems
- 2005
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Ingår i: Polyhedron. - : Elsevier BV. - 0277-5387. ; 24:4, s. 557-562
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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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| 2. |
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| 3. |
- Abu-Youssef, Morsy A.M., et al.
(författare)
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Synthesis and Structure of Silver Complexes with Nicotinate-Type Ligands Having Antibacterial Activities against Clinically Isolated Antibiotic Resistant Pathogens
- 2007
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Ingår i: Inorganic Chemistry. - : American Chemical Society (ACS). - 0020-1669 .- 1520-510X. ; 46:15, s. 5893-5903
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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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| 4. |
- Abu-Youssef, Morsy A. M., et al.
(författare)
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Synthesis, structure, network and thermal analysis of four 5-(pyrazinyl)tetrazolato copper(II) and cobalt(II) complexes
- 2007
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Ingår i: Polyhedron. - : Elsevier BV. - 0277-5387. ; 26:7, s. 1531-1540
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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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| 5. |
- Massoud, Al-Shimaà A A, 1980, et al.
(författare)
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Synthesis, X-ray structure and anti-corrosion activity of two silver(I) pyrazino complexes
- 2009
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Ingår i: Polyhedron. - : Elsevier BV. - 0277-5387. ; 28:13, s. 2794-2802
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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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| 6. |
- Mautner, F. A., et al.
(författare)
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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
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Ingår i: Polyhedron. - : Elsevier BV. - 0277-5387. ; 26:12, s. 2703-2712
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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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| 7. |
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| 8. |
- Massoud, Al-Shimaà A A, 1980, et al.
(författare)
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Bis[4-(dimethylamino)pyridine-κN1]silver(I) nitrate dihydrate
- 2009
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Ingår i: Acta Crystallographica Section C: Crystal Structure Communications. - 0108-2701 .- 1600-5759. ; C65:9, s. m352-m354
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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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| 9. |
- Massoud, Al-Shimaà A A, 1980, et al.
(författare)
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Methyl groups control coordination number, stoichiometry, network and magnetism in a Cu(II)-azide-pyrazine (6,3) 2D net
- 2009
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Ingår i: CrystEngComm. - : Royal Society of Chemistry (RSC). - 1466-8033. ; 11:2, s. 223-225
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Tidskriftsartikel (refereegranskat)abstract
- The methyl groups of [Cu2(2,5-dimethylpyrazine)(N3)4]n, 1, force penta-coordination on the Cu(II) ions, which, together with the di-μ1,1-azido zigzag chains, result in a (6,3) 2D net with dominant ferromagnetic interactions.
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| 10. |
- Massoud, Al-Shimaà A A, 1980, et al.
(författare)
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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
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Ingår i: Journal of Coordination Chemistry. - : Informa UK Limited. - 0095-8972 .- 1029-0389. ; 62:4, s. 519-530
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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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