Crystal and molecular structure of nitrato(6,6′-dimethyl-2,2′-bipyridine)silver(I). A dimer held by stacking and silver-silver interactions (original) (raw)
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Inorganic …, 2010
Ag(2-amino-3-methylpyridine) 2 ]NO 3 (1) and [Ag(pyridine-2-carboxaldoxime)NO 3 ] (2) were prepared from corresponding ligands and AgNO 3 in water/ethanol solutions, and the products were characterized by IR, elemental analysis, NMR, and TGA. The X-ray crystal structures of the two compounds show that the geometry around the silver(I) ion is bent for complex 1 with nitrate as an anion and trigonal planar for complex 2 with nitrate coordinated. ESI-MS results of solutions of 2 indicate the independent existence in solution of the [Ag(pyridine-2-carboxaldoxime)] þ ion. The geometries of the complexes are well described by DFT calculations using the ZORA relativistic approach. The compounds were tested against 14 different clinically isolated and four ATCC standard bacteria and yeasts and also compared with 17 commonly used antibiotics. Both 1 and 2 exhibited considerable activity against S. lutea, M. lutea, and S. aureus and against the yeast Candida albicans, while 2-amino-3-methylpyridine is slightly active and pyridine-2carboxaldoxime shows no antimicrobial activity. In addition, the interaction of these metal complexes with DNA was investigated. Both 1 and 2 bind to DNA and reduce its electrophoretic mobility with different patterns of migration, while the ligands themselves induce no change.
Inorganica Chimica Acta, 2008
The reaction of [Ag 4 (hfac) 4 (THF) 2 ] (hfac À = 1,1,1,5,5,5-hexafluoroacetylacetonate, THF = tetrahydrofurrane) with 2,2 0-bipyrimidine (bpm) leads to single crystals. They crystallise in the triclinic system, space group P 1. Their structure consists of [Ag 4 (hfac) 4 (l 2-bpm) 3 ] tetranuclear complexes. In this complex, Ag(I) ions adopt distorted square planar and trigonal prismatic geometries. When [Ag 4 (hfac) 4 (THF) 2 ] is replaced by monohydrated silver(I) perchlorate, a one-dimensional (1D) compound with a formula of [[Ag(l 2-bpm)] + ] n , nClO 4 À is obtained as single crystals. They crystallise in the monoclinic system, space group P2 1 /c. Their structure consists of [[Ag(l 2bpm)] + ] n chains separated by non-coordinated perchlorate ions. In the chains, the Ag(I) centres adopt a square planar geometry. Finally, starting from [[Ag(l 2-bpm)] + ] n , nClO 4 À and sodium oxalate ðNa 2 ox; ox ¼ C 2 O 2À 4 Þ, another 1D compound with a formula of [Ag(l 2bpm)(l 2-ox)] n , 4nH 2 O is obtained as single crystals. They crystallise in the triclinic system, space group P 1. In these chains, bipyrimidine and oxalate are alternate. They generate a square planar geometry around the Ag(I) cations.
Inorganic Chemistry, 2010
Ag(2-amino-3-methylpyridine) 2 ]NO 3 (1) and [Ag(pyridine-2-carboxaldoxime)NO 3 ] (2) were prepared from corresponding ligands and AgNO 3 in water/ethanol solutions, and the products were characterized by IR, elemental analysis, NMR, and TGA. The X-ray crystal structures of the two compounds show that the geometry around the silver(I) ion is bent for complex 1 with nitrate as an anion and trigonal planar for complex 2 with nitrate coordinated. ESI-MS results of solutions of 2 indicate the independent existence in solution of the [Ag(pyridine-2-carboxaldoxime)] þ ion. The geometries of the complexes are well described by DFT calculations using the ZORA relativistic approach. The compounds were tested against 14 different clinically isolated and four ATCC standard bacteria and yeasts and also compared with 17 commonly used antibiotics. Both 1 and 2 exhibited considerable activity against S. lutea, M. lutea, and S. aureus and against the yeast Candida albicans, while 2-amino-3-methylpyridine is slightly active and pyridine-2carboxaldoxime shows no antimicrobial activity. In addition, the interaction of these metal complexes with DNA was investigated. Both 1 and 2 bind to DNA and reduce its electrophoretic mobility with different patterns of migration, while the ligands themselves induce no change.
Crystal structure of silver nitrate β-alanine [Ag+(NO3 )_ (NH3 + CH2CH2COO_)]
Zeitschrift für Kristallographie, 1984
is monoclinic, space group P2Jn with a = 6.656(5), 6 = 8.280(5), c = 12.975(4) Ä and 0 = 94.90(3). The title compound grows in the form of platelets. Two alanine groups make a dimeric formation with silver, and the nitrate groups are in trans configuration. The Ag-Ag separation is 2.855 A. The Ag-Ο bond distances are 2.210 A and 2.198 Ä. The nitrate ion is bonded to the alanine moiety by two hydrogen bonds of type Ν-H.. .O: 3.090 A and 2.961 A. A pair of oxygen atoms from two adjacent nitrate ions are involved in weak covalent bonds with Ag, at distances of 2.58 A and 2.57 A.
Structure of [2-(aminomethyl)pyridine]silver(I) nitrate and EPR studies of its oxidation product
Polyhedron, 1997
Reaction of AgNO 3 with excess 2-(aminomethyl)pyridine (amp) in water led to the crystallization of Ag(amp)NO3 (1). Nearly linear coordination of silver(I) by pyridine-N and amino-N from two different amp molecules results in a polymeric chain structure of 1. The packing is stabilized by ring-ring stacking interactions between two inversion-related polymer chains. Oxidation of 1 with (NHa)2S208 resulted in an orange solution from which a magnetically dilute Ag n complex was crystallized by the addition of NH4PF6. It gave a well-resolved EPR spectrum and is formulated as silver(II) picolinate co-crystallized with NH4PF6.
Acta Crystallographica Section E Crystallographic Communications, 2018
The asymmetric unit of the title compound, [Ag(C24H46N6O2)](NO3)2 [C24H46N6O2 is (5,16-dimethyl-2,6,13,17-tetraazatricyclo[16.4.0.07,12]docosane-2,13-diyl)diacetamide, L], consists of one independent half of the [Ag(C24H46N6O2)]2+ cation and one nitrate anion. The Ag atom, lying on an inversion centre, has a square-planar geometry and the complex adopts a stable trans-III conformation. Interestingly, the two O atoms of the pendant acetamide groups are not coordinated to the AgII ion. The longer distance of 2.227 (2) Å for Ag—N(tertiary) compared to 2.134 (2) Å for Ag—N(secondary) may be due to the effects of the attached acetamide group on the tertiary N atom. Two nitrate anions are very weakly bound to the AgII ion in the axial sites and are further connected to the ligand of the cation by N—H...O hydrogen bonds. The crystal packing is stabilized by hydrogen-bonding interactions among the N—H donor groups of the macrocycle and its actetamide substituents, and the O atoms of the nit...
Inorganic Chemistry Communications, 2011
Synthesis and X-ray single crystal structure analysis of the compound {[Ag 2 (μ 2 -bpym)(μ-O-NO 3 ) 2 ]} n , (1), (where bpym = 2,2′-bipyrimidine) are presented. Compound (1) has a (6,3)-2D honeycomb structure with a tetrahedral coordination geometry around the Ag(I) ion. In contrary to the solid state structural investigation, ESI-MS for (1) in solution shows a strong peak at m/z 423.0269 which indicates that the [Ag(bpym) 2 ] + cation is dominating instead of [Ag 2 (bpym)] 2+ . The anti-microbial activity of (1) was screened against 15 multi-drug resistant bacteria in comparison to silver(I) sulphadiazine and it showed a high activity against Burkholderia mallei which causes glanders; with a MIC value of 4 μg/ml. Crown
Inorganica Chimica Acta, 2005
Syntheses and room-temperature single-crystal X-ray structure determinations are recorded for a number of adducts of 1:1 stoichiometry of silver(I) oxyanion salts (perchlorate, nitrate, trifluoroacetate (‘tfa’) (increasing basicity)) with 2,2′-bis(pyridine) ligands (2,2′-bipyridyl, ‘bpy’; 2,2′-biquinolyl, ‘bq’; 2,2′-dipyridylketone, ‘dpk’; 2,9-dimethylphenanthroline, ‘dmp’). The adducts take two forms: (a) neutral mononuclear molecules, in which the 2,2′-bis(pyridine) ligand behaves as a chelate, with the silver coordination number dependent on the denticity of the anion; these are Agtfa:bpy (1:1) and AgClO4:bq (1:1) (and various (ionic) acetonitrile or pyridine solvates AgClO4:bq/dmp:MeCN/py (1:1:1), in which the solvent molecules are coordinated); and (b) one-dimensional polymers. The latter are diverse: in AgClO4:bpy, dpk (1:1), the anion is discrete, the polymer made up of an array of two-coordinate silver atoms linked by bpy ligands twisted about their central connecting element. In AgNO3:bpy, bq (1:1), the bpy ligands are chelating with the oxyanions bridging, cf. previously reported AgNO3:dpk (1:1), in which the nitrate chelates the metal, with the dpk bridging, chelating N,O to one silver, while the other nitrogen bridges to the next. With Agtfa, a novel binuclear adduct has been isolated in conjunction with the hydrated ligand, Agtfa:dpk:(dpk · H2O) (1:1:2). The far-IR spectra of several of these complexes show bands that can be assigned to the ν(AgN) modes, the positions of these bands correlating well with the relative Ag–N bond lengths.Syntheses and single-crystal X-ray structural characterizations are also reported for various adducts of silver(I) perchlorate, nitrate and trifluoromethanesulfonate with bpy, bq, ‘phen’ (= 1,10-phenanthroline), and ‘dmp’, of stoichiometry AgX:L (1:2). In each case the complex is ionic [AgL2]X; the silver atom is four-coordinate, but diverse and remarkable variations in stereochemistries associated with changes in the interligand N–Ag–N angles, presumably influenced by the different packing arrangements, are observed.The title compounds of 1:1 stoichiometry display two structural forms: (a) neutral molecules in which the bipyridine ligand behaves as a chelate and the silver coordination number depends on the denticity of the oxyanion; and (b) a diverse array of one-dimensional polymers. The 1:2 adducts are all ionic [AgL2]X with 4-coordinate silver, but display diverse and remarkable stereochemistries associated with changes in the interligand N–Ag–N angles.
Polyhedron, 1998
The coordination of silver(I) acetate with 2,2' : 6',2"-terpyridine (tpy) and 6,6"-diphenyl-2,2' : 6',2"terpyridine (dptpy) has been investigated. In contrast to the behaviour with copper(I), no dinuclear doublehelical species have been unambiguously isolated although there is evidence that double-helical [Ag2L2] 2÷ complexes exist in weakly-coordinating solvents. In the case of 2,2' : 6',2"-terpyridine, a species containing a square-planar [Ag(tpy)(MeCN)] ÷ caton has been isolated and structurally characterised whilst with 6,6"diphenyl-2,2' : 6',2"-terpyridine a related but very distorted [Ag(dptpy)(MeCN)] ÷ species has been structurally characterised.
Inorganica Chimica Acta, 1993
The single crystal X-ray analysis of the 2:l complex between tribenzopyridino-1%crown-5 (1) and AgNO, is reported. Crystals of the complex are triclinic, Pi, with a = 13.182(l), b = 13.612(2), c = 12.720(l) A, CX= 105.39(l), p=99.96(1), y=103.04(1)0 and D,=1.54 g crne3 for Z=2. The Ag+ cation forms a charge separated sandwich structure where Ag+ is in an octa-coordinated environment involving two nitrogen and six oxygen atoms of the macrorings. The complex has a complete hydrophobic shell.