Syntheses, structures and vibrational spectroscopy of some 1:1 and 1:2 adducts of silver(I) oxyanion salts with 2,2'-bis(pyridine) chelates
TL;DR: In this paper, a number of adducts of 1:1 stoichiometry of perchlorate, nitrate and trifluoromethanesulfonate with 2,2′-bis(pyridine) ligands are described.
About: This article is published in Inorganica Chimica Acta.The article was published on 2005-11-15. It has received 61 citations till now. The article focuses on the topics: Denticity & Pyridine.
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TL;DR: The square planar Ag(I) ion is a rare ion, with only ∼2% of all reported silver complexes possessing this stereochemistry as discussed by the authors, despite the fact that there are currently around 65 well characterised complexes containing squareplanar Ag (I) ions, about half of which are coordination polymers.
204 citations
TL;DR: In this article, the I1O1 and I2O0 connectivity of compounds with aromatic carboxylate ligands has been investigated for single crystal X-ray diffraction.
Abstract: Solvothermal reactions of Ca(NO3)2 or Ba(NO3)2 with aromatic carboxylate ligands afforded four new inorganic–organic hybrid frameworks, [Ca(PBDC)(H2O)3]n (1), [Ca(OBDC)(H2O)]n (2), [Ba5(OBDC)4(H2O)2(NO3)2]n (3), and [Ba3(BTC)2(H2O)4]n (4) (H2PBDC = terephthalic acid, H2OBDC = phthalic acid, H3BTC = 1,3,5-benzenetricarboxylic acid). These compounds have been fully characterized by single crystal X-ray diffraction, powder X-ray diffraction, satisfactory elemental analysis, IR spectra, and TG analysis. X-ray analysis shows that compound 1 features a one-dimensional chain (1D) structure with the I1O0 connectivity, both compound 2 and compound 3 feature a two-dimensional (2D) layer structure with the I1O1 connectivity, I2O0 connectivity, respectively, compound 4 features a three-dimensional (3D) framework with a rare I3O0 connectivity. Thermal stabilities and luminescent properties of compounds 1–4 and NLO property of compound 4 have also been investigated.
103 citations
TL;DR: complexes 1-5 have been found to display effective antimicrobial activity against the series of bacteria and fungi, and some of them are potential candidates for antiseptic or disinfectant drugs.
Abstract: Five new silver(I) complexes of formulas [Ag(Tpms)] (1), [Ag(Tpms)(PPh3)] (2), [Ag(Tpms)(PCy3)] (3), [Ag(PTA)][BF4] (4), and [Ag(Tpms)(PTA)] (5) {Tpms = tris(pyrazol-1-yl)methanesulfonate, PPh3 = triphenylphosphane, PCy3 = tricyclohexylphosphane, PTA = 1,3,5-triaza-7-phosphaadamantane} have been synthesized and fully characterized by elemental analyses, 1H, 13C, and 31P NMR, electrospray ionization mass spectrometry (ESI-MS), and IR spectroscopic techniques. The single crystal X-ray diffraction study of 3 shows the Tpms ligand acting in the N3-facially coordinating mode, while in 2 and 5 a N2O-coordination is found, with the SO3 group bonded to silver and a pendant free pyrazolyl ring. Features of the tilting in the coordinated pyrazolyl rings in these cases suggest that this inequivalence is related with the cone angles of the phosphanes. A detailed study of antimycobacterial and antiproliferative properties of all compounds has been carried out. They were screened for their in vitro antimicrobial activi...
78 citations
TL;DR: New coordination polymers have been obtained by the self-assembly of silver salts AgX and 2,4-diamino-6-R-1,3,5-triazines L of formulas AgLX and a new species has been detected at low temperatures, and this exhibits restricted rotation of the phenyl ring.
Abstract: New coordination polymers have been obtained by the self-assembly of silver salts AgX (X = BF4, PF6, CF3SO3) and 2,4-diamino-6-R-1,3,5-triazines L (R = phenyl and p-tolyl) of formulas AgLX (1−6). A complex of different stoichiometry, [Ag3L2(H2O)(acetone)2](BF4)3, 7 (R = phenyl), has also been synthesized. The three-dimensional structures of five compounds have been determined by X-ray diffraction studies. For the AgLX complexes, when X = BF4 and R = phenyl or p-tolyl, chiral chains with alternating Ag and L are formed. The chains are cross-linked by the counteranions in a three-dimensional fashion through hydrogen bonds and weak Ag···F interactions giving rise to a structure with solvent-filled channels. Different and more compact structures have been found when the counteranion is CF3SO3 (OTf). When R = phenyl, sheets are formed which consist of [Ag2(OTf)2L2] units with double triflate bridges and which contain columns of π−π stacked arenes. Hydrogen bonds connect the sheets. When AgOTf is used and R is ...
59 citations
TL;DR: In this article, the authors used 4,4′-disubstituted-2,2′-bipyridines for the generation of various Ag(I) derivatives, such as NO3−, ClO4− and Sac (sa...
Abstract: 4,4′-Disubstituted-2,2′-bipyridines have been used for the generation of various Ag(I) derivatives, where the nature of the counteranions in the reacting Ag(I) salt, such as NO3−, ClO4− and Sac (sa...
55 citations
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249 citations
TL;DR: In this article, the ambidentate ligand 5,5′-dicyano-2,2′-bipyridine (L) was found to function as a bi-, tri- or tetra-dentate chelate or chelate/bridging ligand in the co-ordination of silver ions.
Abstract: The ambidentate ligand 5,5′-dicyano-2,2′-bipyridine (L) was found to function as a bi-, tri- or tetra-dentate chelate or chelate/bridging ligand in the co-ordination of silver ions. The mode of co-ordination depends on the anion and the crystallization conditions and was elucidated by single crystal X-ray diffractometry. With metal-co-ordinating anions such as NO3– and CF3SO3– a tridentate co-ordination mode of L is observed which involves the two bipyridine nitrogen donor atoms and one cyano group. The latter bridges to a neighboring silver center so that a one-dimensional co-ordination polymer results. For NO3– this co-ordination polymer forms a 21 helix. With less co-ordinating anions such as BF4– and PF6– monomeric bis-chelate complexes are obtained, where L assumes a bidentate co-ordination mode involving only the bipyridine nitrogen donor atoms. In the case of the PF6– anion a variation in the solvent of crystallization also produced a two-dimensional hexagonal co-ordination polymer where L functions as a tetradentate ligand using all four nitrogen donor atoms in chelation and bridging to the silver centers.
190 citations
TL;DR: The transfer of chirality has been applied innumerable times in organic chemistry since the end of the 19th century, when it was introduced in the so-called asymmetric synthesis by E. Fischer as discussed by the authors.
Abstract: Transfer of chirality during the build-up of molecules has been applied innumerable times in organic chemistry since the end of the 19th century, when it was introduced in the so-called asymmetric synthesis by E. Fischer. Although analogous reactions were introduced in co-ordination chemistry in its early development, diastereoselective reactions have not been applied in a very systematic way for co-ordination species. The highly versatile co-ordination geometry of metal centres makes the synthesis of a selected stereoisomer in general a formidable task. In the present article an account on new developments in the field is given, focussing on recently synthesized molecules, where natural chiral products are used to create a large number of chiral ligands which predetermine the chirality at metal centres.
160 citations
TL;DR: The 1,10-phenanthroline (phen) ligand in metal complexes commonly forms offset face-to-face (OFF) motifs, and less frequently edge-toface (EF) motif as mentioned in this paper.
Abstract: The 1,10-phenanthroline (phen) ligand in metal complexes commonly forms offset face-to-face (OFF) motifs, and less frequently edge-to-face (EF) motifs. An investigation of the 335 M(phen) complexes, 159 M(phen)2 complexes, and 33 M(phen)3 complexes in the Cambridge Structural Database has revealed that in crystals these primary OFF and EF motifs combine to form concerted motifs, and extended motifs, in a variety of ways. Stacks of phen ligands engaging OFF motifs on both faces are very common for complexes M(phen) and M(phen)2. Even more common for M(phen)2 are zigzag chains in which each phen ligand links to neighbours in the chain with an OFF motif. The parallel fourfold aryl embrace (P4AE, comprised of one OFF and two EF) occurs for complexes M(phen)2 and M(phen)3, with some variety in geometry between a single OFF at one extreme to (EF)2 at the other. This variability in the P4AE is a consequence of the larger surface area of the phen ligand, compared with those of 2,2′-bipyridyl (bipy) ligands or phenyl groups (which also form this motif), and has been evaluated by calculations of the supramolecular attractive energies. The P4AE associate further, maximising the use of phen surfaces, to form chains of P4AE, chains of P4AE·OFF, and compact two-dimensional nets propagated by both P4AE and OFF motifs. There are examples of three-dimensional nets using these motifs. There is a notable absence of sixfold aryl embraces (6AE, comprised of concerted (EF)6) amongst M(phen)3 complexes, and a clear difference with M(bipy)3 complexes where 6AEs are prevalent. Various M(phen)2 and M(phen)3 complexes pack in crystals to form tight hydrophobic domains, often as slabs, segregated from hydrophilic domains containing hydrogen bonding components and anions. The crystallisation and crystal packing of [Co(phen)3][BF4]2·H2O·EtOH, which exemplifies this pattern, are reported. The implications for crystal engineered enantioselection by [M(phen)3] complexes are discussed.
144 citations
TL;DR: In this paper, structural features and physical properties of dmphen (2,9-dimethyl-1,10-phenanthroline) complexes with d10 metals ZnII, Ni0 and AgI were determined.
69 citations