Search results for "HDI"
showing 10 items of 789 documents
Iodination of antipyrine with [N–I–N]+ and carbonyl hypoiodite iodine(i) complexes
2023
A series of iodine(I) complexes, both known and new, were synthesised and the dependence of iodination reactivity on the identity of the Lewis bases and anions present was investigated. Using a previously established screening protocol based on the iodination of antipyrine to iodo-antipyrine, the capability of the iodine(I) species to perform the iodination was tested and compared, especially in relation to Barluenga's reagent, [I(pyridine)2]BF4. The results indicated that the identity of both the Lewis bases and the anion influence the iodination capability of the iodine(I) species, and that the less efficient reagents can deliver favourably comparable percentage conversions with longer re…
Carbonyl hypoiodites from pivalic and trimesic acid and their silver(I) intermediates
2022
The first tris(O–I–N) carbonyl hypoiodites have been synthesised based on trimesic acid and pyridine or 4-methylpyridine, with their structures definitively confirmed by single crystal X-ray diffraction (SCXRD). The more soluble carbonyl hypoiodites based on pivalic acid have also been studied via NMR, SCXRD, and computational analyses, enabling the study of the direct silver(I) precursor and intermediates of the resulting carbonyl hypoiodites generated using a range of substituted pyridines. peerReviewed
Halogen-Bonded [N–I–N]− Complexes with Symmetric or Asymmetric Three-Center–Four-Electron Bonds
2023
A series of LH[Z–I–Z] halogen(I) complexes, where Z = saccharinato or phthalimido anions and LH = pyridinium, pyrazinium, tetrabutyl (TBA)- or tetramethylammonium (TMA) cations, were prepared, structurally characterized, and discussed as complexes consisting of a [N–I–N]− anion with a three-center–four-electron (3c-4e) halogen bond, and a hydrogen-bonding (pyridinium or pyrazinium) or inert (TBA or TMA) cation. The symmetric [N–I–N]− anion, reminiscent of the triiodide [I–I–I]− anion, is found to be structurally equivalent to its cationic analogue [N–I–N]+ with N–I bond lengths of 2.26 Å. In contrast to the homoleptic [N–I–N]+ complexes, asymmetry of the N–I bond lengths (2.21 and 2.28 Å) w…
Macrocyclic complexes based on [N⋯I⋯N]+ halogen bonds
2021
New 1–2 nm macrocyclic iodine(I) complexes prepared VIA a simple ligand exchange reaction manifest rigid 0.5–1 nm cavities that bind the hexafluorophosphate anion in the gas phase. The size of the cavities and the electrostatic interactions with the iodine(I) cations influence the anion binding properties of these macrocyclic complexes. peerReviewed
Ligand exchange among iodine(I) complexes
2022
A detailed investigation of ligand exchange between iodine(I) ions in [N⋯I⋯N]+ halogen-bonded complexes is presented. Ligand exchange reactions were conducted to successfully confirm whether iodine(I) complex formation, via the classical [N⋯Ag⋯N]+ to [N⋯I⋯N]+ cation exchange reaction from their analogous Ag+ complexes, could be determined solely by using 1H NMR spectroscopy. In instances where the formation of the iodine(I) complex was unclear or in low yield by the traditional cation exchange reaction, a ligand exchange reaction was used to form the desired iodine(I) complexes in a quantitative manner. Mixing two homoleptic [N⋯I⋯N]+ iodine(I) complexes in 1 : 1 ratio was found to undergo a…
Do 2-coordinate iodine(I) and silver(I) complexes form Nucleophilic Iodonium Interactions (NIIs) in solution?
2022
The interaction of a [bis(pyridine)iodine(I)]+ cation with a [bis(pyridine)silver(I)]+ cation, in which an iodonium ion acts as nucleophile by transferring electron density to the silver(I) cation, is reinvestigated herein. No measurable interaction is observed between the cationic species in solution by NMR; DFT reveals that if there is an attractive interaction between this complexes in solution, it is dominantly the π-π interaction of pyridines peerReviewed
Strategic Communication for Cyber-security Leadership
2013
The purpose of this paper is to form a preliminary hypothesis about how to identify characteristics that a leader needs to focus on when aiming at cyber-security leadership. The paper studies the key concepts and terms of cyber security and presents the physical world and the cyber world framework. The paper refers to a system model of a society and uses that model to analyze the results of two limited media surveys about cyber-related newspaper articles. The media surveys indicate a strong need to organize the cyber world. peerReviewed
Lukijakunnan rajamailla : sanomalehden muuttuvat merkitykset arjessa
2007
Nykymuotoiset sanomalehdet mahtuvat yhä harvemman kansalaisen arkeen. Lehdet ovat hankalia luodakseen joka-aamuisen lukemisrutiinin kiireisille, liikkuville ja sähköisiin välineisiin tottuneille ihmisille, eivätkä lehdet herätä enää kiinnostusta perinteisillä aihe- ja käsittelytavoillaan. Sanomalehtien uskollisiin lukijakuntiin näyttää ilmaantuvan murtumia.Sanomalehtien ei-tilaajat kokevat markkinoituneessa mediabisneksessä itsensä valikoiviksi kuluttaja-asiakkaiksi, joilla on valta päättää tilaako lehden vai ei. Kaikki eivät pidä kansalaisuutensa ehtona sanomalehden säännöllistä tilausta, vaikka siihen saisi tarvittaessa toimeentulotukeakin. Pätkätöiden luomassa epävarmuudessa lehden hinta…
Estonia : From analog to digital - one step forward but two steps back?
2022
In Estonia, the key decisions concerning media accountability were made in the 1990s: First, a press council was established in 1991, then a code of ethics was adopted in 1997, and an ombudsperson institution for the public broadcasting was established in 2007. Since then, there has not been any improvement – the accountability system has not been adapted to the challenges of digitalization and the internet, and even the code of ethics has not been amended accordingly. However, Estonia has steadily occupied high positions in the global press freedom rankings, which evidences that the general political environment is favorable for media freedom. Estonian journalists are cynical about self-re…
Up with ecology, down with economy? : The consolidation of the idea of climate change mitigation in the global public sphere
2018
Building on theories of valuation and evaluation, we develop an analytical framework that outlines six elements of the process of consolidation of an idea in the public sphere. We then use the framework to analyse the process of consolidation of the idea of climate change mitigation between 1997 and 2013, focusing on the interplay between ecological and economic evaluations. Our content analysis of 1274 articles in leading newspapers in five countries around the globe shows that (1) ecological arguments increase over time, (2) economic arguments decrease over time, (3) the visibility of environmental nongovernmental organizations as carriers of ecological ideas increases over time, (4) the …