An interpenetrating coordination polymer containing weak hydrogen bonds and argentophilic interactions (original) (raw)
Related papers
2012
AgL]NO 3 and [AgL 1.5 ]NO 3 (I) complexes, where L = NH 2 -C 6 H 4 -C(CH 3 ) 2 -C 6 H 4 -C(CH 3 ) 2 -C 6 H 4 -NH 2 , were obtained. The structure of compound I was determined. Triclinic crystals, space group P , a = 6.259(1) Å, b = 15.663(1) Å, c = 20.653(3) Å, α = 71.13(1)°, β = 81.66(1)°, γ = 82.45(1)°, V = 1887.8(3) Å 3 , ρ calc = 1.208 g/cm 3 , Z = 2. Ag + ion coordinated to three nitrogen atoms of ligands L has a distorted T shaped coordination. The structure of I is built of cationic polymeric chains [Ag(L) composed of one bridging ligand L (Ag-N(l) = 2.207(6) Å and Ag-N(2) = 2.221(6) Å, NAgN angle is 160.5(2)°). Second crystallo graphically nonequivalent centrosymmetrical ligand L pairwise combines the chains to form infinite tapes along direction [010] (Ag(l)-N(3) = 2.529(6) Å). Noncoordinated N anion (Ag(1)···O(1) = 2.982(6) Å) participates in N-H···O hydrogen bonds as proton acceptor to form 3D supramolecular assembly.
Coordination polymers via self-assembly of silver(i) and cis-bis-nitrile-oxa-bowl derivatives
CrystEngComm, 2013
A series of silver(I)-based coordination polymers (AgCPs) have been synthesized using three new nonchelating cis-bis-nitrile derivatives of oxa-bowls, L1-L3, as ligand components. The ligands are designed to provide conformational restrictions as well as semi-rigid directionality to the coordination vectors extended from the nitrile functionalities. The steric bulks around the oxa-bowl spacer moieties are gradually escalated to study their influence on the topologies of the ensuing AgCPs. Two silver salts i.e. AgSbF 6 and AgPF 6 are used to check the influence of anions on the structural architectures. Ziz-zag-sheet type 2-D AgCPs are formed with the ligands L1 and L2 possessing less steric bulk. All the metal centres are found to be tetracoordinated by nitrile-nitrogens of the same sheet giving distorted-bisphenoidal geometries. Additional short interactions of the silver(I) centres of a given sheet with the oxygen of the oxa-bowls belonging to the neighbouring stacked sheets are observed. The bulky ligand L3 behaved differently where the metal centres are tetracoordinated although only two of the ligating units are derived from the nitrile nitrogens and the remaining two are from, depending upon the counter anion, the counter anion/oxygen of oxa-bowls or two water molecules. The overall arrangements in the AgCPs of L3 are of the 2-D carpet type (for SbF 6 − ion) composed of interconnected chains, and 1-D ladder type (for PF 6 − ion) constructed from two chains. Cation-π interactions are found between the aromatic part of L3 of a given chain and the silver(I) of the adjacent chain that are interdigitated. † Electronic supplementary information (ESI) available: The 1 H NMR and 13 C NMR spectra of the dimethyl acetals (acetal-1, acetal-2 and acetal-3), the ligands (L1, L2 and L3) and the complexes are available. IR spectra of the ligands and the complexes, PXRD patterns of the complexes, ESI-MS and MALDI-MS of 1a are also provided. X-ray crystallographic data in CIF format for the structures reported in this paper (L1, L2, L3, 1a, 1b, 2a, 2b, 3a, and 3b) is deposited with CCDC. The CCDC numbers are 942145-942153. Crystal data and structure refinement parameters for the ligands and complexes, relevant bond lengths and angles of the complexes and a brief description of the structure of 1b and 2b, are available. For ESI and crystallographic data in CIF or other electronic format see CrystEngComm, 2013, 15, 9623-9633 | 9623 This journal is Scheme 1 Structure of the cis-bis-nitrile ligand L and the oxa-bowl derivatives L1-L3 (the concave faces of L1-L3 are shown). Scheme 2 Synthesis of the ligands L1-L3 (the convex faces are shown).
Acta crystallographica. Section E, Structure reports online, 2014
The asymmetric unit of the title compound, {[Ag(C11H11N3)]NO3·2(CH3)2SO} n , comprises one Ag(I) atom, one N-(pyridine-4-ylmeth-yl)pyridine-3-amine ligand, one nitrate anion and two dimethyl sulfoxide mol-ecules. The Ag(I) atoms are bridged by two pyridine N atoms from two symmetry-related ligands, forming a helical chain and adopting a slightly distorted linear coordination geometry [N-Ag-N = 175.37 (8)°]. The helical chain, with a pitch length of 16.7871 (8) Å, propagates along the b-axis direction. In the crystal, symmetry-related right- and left-handed helical chains are alternately arranged via Ag⋯Ag inter-actions [3.4145 (4) Å] and π-π stacking inter-actions [centroid-centroid distance = 3.650 (2) Å], resulting in the formation of a two-dimensional supra-molecular network extending parallel to (100). Weak Ag⋯O [2.775 (2), 3.169 (4) and 2.690 (2) Å] inter-actions, as well as several N-H⋯O and C-H⋯O hydrogen-bonding inter-actions, contribute to the stabilization of the crystal s...
Acta crystallographica. Section E, Crystallographic communications, 2016
In the title compound, {[Ag(C29H25N3)2]NO3·CH3OH·H2O} n , the Ag(I) cation is four-coordinated by two pyridine N atoms and two imidazole N atoms from four individual 4-(1-(5'-isopropyl-[1,1':3',1''-terphen-yl]-2'-yl)-1H-imidazol-2-yl)pyridine (i-pro-pyim) ligands. This gives rise to a highly distorted tetra-hedral geometry with bond angles falling in the range 100.33 (19)-122.76 (19)°. Two crystallographically independent i-pro-pyim ligands (A and B) adopt very similar conformations to one another, such that the dihedral angles between the pyridyl and imidazolyl rings in the two ligands are 40.7 (3) and 42.2 (3)°, respectively. Each i-pro-pyim ligand binds two symmetry-related Ag(+) cations, leading to the formation of 14-membered cyclic dimers, in which the Ag(I) atoms are separated by 6.963 (2) Å for the Ag-A 2-Ag dimer and 7.020 (2) Å for Ag-B 2-Ag. These cyclic dimers are alternately connected to each other by sharing Ag(I) atoms, resulting in the formati...
Journal of Inorganic and Organometallic Polymers and Materials, 2014
Yellow crystals of the coordination polymers (CP) [Ag(qox)NO 3 ], 1 [Ag(pyzca)], 2 were obtained by the reaction of AgNO 3 , quinoxaline (qox) or pyrazinecarboxylic acid (pyzcaH), respectively. The crystal structure of 1 displays 1D-extended chain of [Ag(qox)] n with NO 3 coordinated to every Ag atom. The 1D-chains of 1 are interconnected by strong hydrogen bonds, p-p stacking and short contacts developing two dimensional sheets containing channels. Furthermore, the overall packing arrangement of 1 results 3D topology with corrugated network. The Ag atom in 2 acquires tetrahedral geometry while each pyzca ligand provides three donor sites connected to three Ag atoms. The structure of CP 2 displays 1D-extended helical chain of [Ag(pyzca)] n . The 3D-packing of the CP 2 creates nanometer pores. The luminescence properties of 1 and 2 were discussed.
Heterotopic silver–NHC complexes: from coordination polymers to supramolecular assemblies
Dalton Transactions, 2010
New coordination polymers based on different combinations of silver atoms and pyridyl-substituted N-heterocyclic carbene moieties are described. The addition of Zn(II) templates leads to Ag-Zn supramolecular assemblies via selective Zn ◊ ◊ ◊ N interactions; a process that can be reverted. 30 2533940; Tel: +31 30 2532538 † Electronic supplementary information (ESI) available: Characterization of compounds 2, 3, 4, 5A and 5B, GPC and UV-vis spectra of 2, and UV-vis titration experiments for assemblies 5A and 5B. CCDC reference numbers 773279-773281. For ESI and crystallographic data in CIF or other electronic format see Scheme 1 Synthesis of complexes 1-3.
Journal of Molecular Structure, 2011
Construction of AgX (X À = ClO À 4 and BF À 4 ) with highly flexible N,N,N 0 ,N 0 -tetrakis(ethylisonicotinoyl)ethylendiamine (L) has been scrutinized for the weak argentophilic, Ag anion, and AgÁsolvent interactions. All such complexes afford coordination polymers consisting of 2:1 (Ag(I):L). [Ag 2 (L)(CH 3 CN) 2 ](X) 2 (X À = ClO À 4 and BF À 4 ) and [Ag 2 (L)(H 2 O)](BF 4 ) 2 are double-stranded 1D, whereas [Ag 2 (ClO 4 ) 2 (L)(Me 2 CO) 2 ] yields a 2D network structure. The molecular construction has been affected by anions, solvents, and the crystallization method. The natures of anion-and solvent-coordination, including the argentophilic interaction play important roles in the formation of skeletal structures. For [Ag 2 (L)(CH 3 CN) 2 ](ClO 4 ) 2 , weakly coordinated solvate acetonitrile reversibly associates and dissociates in the solid state.