Cation and hydrogen bonding effects on the self-association and luminescence of the dicyanoaurate ion, [Au(CN)2]
نویسندگان
چکیده
The colorless salts [C5H10NH2][Au (CN)2], [C4H8NH2][Au (CN)2], [Ph2NNH3][Au (CN)2] H2O and [(n-C3H7)4N][Au(CN)2] H2O have been prepared by evaporation of aqueous solutions of potassium dicyanoaurate and the chloride salt of the appropriate cation. Hydrogen bonding between the cations and the cyano groups of the anions facilitates the formation of structures with strong aurophilic interactions between the anions. Thus, the [Au(CN)2] ions self-associate in the three salts [C5H10NH2][Au (CN)2] (Au Au 3.0969(3) Å), [C4H8NH2][Au (CN)2] (Au1 Au2 3.0795(4) Å), [Ph2NNH3][Au (CN)2] H2O (Au Au 3.0866(4) Å), while in [(n-C3H7)4N][Au (CN)2] H2O, which lacks N–H units, the gold ions are widely dispersed. The crystals of [C5H10NH2][Au (CN)2], [C4H8NH2][Au(CN)2] and [Ph2NNH3][Au (CN)2] H2O each show strong blue luminescence at room temperature, while [(n-C3H7)4N][Au (CN)2] H2O is non-luminescent.
منابع مشابه
Aurophilicity-coordination interplay in the design of cyano-bridged nickel(II)-Gold(I) bimetallic assemblies: structural and computational studies of the gold(I)-gold(I) interactions.
Two polymorphic cyano-bridged Au(I)-Ni(II) bimetallic complexes of formulas [Ni(en)2Au(CN)2][Au(CN)2] (1) and [Ni(en)2[Au(CN)2]2] (2) have been prepared from the 1:2 reaction between [Au(CN)2]- and either [Ni(en)2Cl2]Cl or [Ni(en)3]Cl2.2H2O, respectively. The structure of 1 consists of polymeric cationic chains of alternating [Au(CN)2]- and [Ni(en)2]2+ units running along the a axis and [Au(CN)...
متن کاملحذف سیانید از محلول های آبی با استفاده ازرزین نانو ذرات آهن (لیواتیت FO36)
Introduction: Cyanide, an environmental pollutant which is found in many different industrial effluents, causes water resources pollution being hazardous to human and environment. Cyanide can be removed from aqueous solutions by different methods but most of them are very expensive. In this study, Lewatit FO36 exchange resin was used to remove Cyanide in a batch system. Methods: Removing the...
متن کاملA New Colorimetric Azo-azomethine Probe for Fluoride Ion Detection Based on the Proton Transfer Signaling Mode: Real-life Applications
Four novel receptors were designed and synthesized for colorimetric detection of F− ions. The introduction of four electron withdrawing groups into the backbone of the receptors makes the two phenolic groups efficient hydrogen bonding sites. The binding properties of receptors with anions were examined for the first time by UV–Vis, 1H NMR and fluorescence spectroscopies. The addition of F− resu...
متن کاملHydrogen-promoted oxygen activation by free gold cluster cations.
Small gas-phase gold cluster cations are essentially inert toward molecular oxygen. Preadsorption of molecular hydrogen, however, is found to cooperatively activate the binding of O(2) to even-size Au(x)(+) (x = 2, 4, 6) clusters. Measured temperature- and reaction-time-dependent ion intensities, obtained by ion trap mass spectrometry, in conjunction with first-principles density-functional the...
متن کاملAdsorption of Cr(III) and Mg(II) from Hydrogen Peroxide Aqueous Solution by Amberlite IR-120 Synthetic Resin
In concentration of hydrogen peroxide, first, the solution should be quite pure, and then, it concentrate with methods such as vacuum distillation and cooling crystallization, because impurities in the hydrogen peroxide solution in high concentrations are causing decomposition of this substance; that is very dangerous. The purpose of this article is separation of chromium and magne...
متن کامل