Search results for "HD"

Iodine(i) complexes incorporating sterically bulky 2-substituted pyridines

2022

The silver(I) and iodine(I) complexes of the 2-substituted pyridines 2-(diphenylmethyl)pyridine (1) and 2-(1,1-diphenylethyl)pyridine (2), along with their potential protonated side products, were synthesised to investigate the steric limitations of iodine(I) complex formation. The complexes were characterised by 1H and 1H–15N HMBC NMR, X-ray crystallography, and DFT calculations. The solid-state structures for the silver(I) and iodine(I) complexes were extensively compared to the literature and analysed by DFT to examine the influence of the sterically bulky pyridines and their anions. peerReviewed

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

Näkökulmia johdon kontrolliin : ulkoista valvontaa ja subjektiivista tulkintaa

2009

Johdon tuen merkitys toiminnanohjausjärjestelmän käyttöönotossa

2016

Tämä tutkielma keskittyy yrityksen johdon tuen merkitykseen toiminnanohjausjärjestelmän käyttöönotossa. Toiminnanohjausjärjestelmä on suunniteltu ratkaisemaan liiketoimintaprosessien tehokkuuden ongelmakohtia. Onnistuneen käyttöönoton tulokset vaikuttavat suoraan organisaation liiketoiminnan prosesseihin, ja näkyvät yritykselle ajan ja rahan säästämisenä. Toiminnanohjausjärjestelmien huolellinen käyttöönotto on ratkaisevan tärkeää yrityksen tulevaisuuden kilpailustrategian kannalta. Ymmärtämällä mitä ratkaisuja on tehty käyttöönottoprosessin aikana ja selvittämällä mikä on mennyt pieleen antaa merkittävää ymmärrystä kriittisiä menestystekijöitä kohtaan. Kriittisiä menestystekijöitä määritel…

Kirjallisuuskatsaus johtaja-alaisvuorovaikutussuhteen tutkimukseen

2018

Johtaja-alaisvuorovaikutussuhde on viestinnän ja vuorovaikutuksen kautta syntynyt ja muovautunut kahden osapuolen välinen suhde työpaikalla, jossa toisella on hierarkkista valtaa ohjata toista. Tämä opinnäytetyö on kirjallisuuskatsaus, jossa tarkastellaan johtajaalaisvuorovaikutussuhteen tutkimusta viestinnän näkökulmasta viimeisen kymmenen vuoden ajalta. Tutkielman tavoitteena on systemaattisesti kartoittaa ja jäsentää viestinnän alan tutkimusta johtaja-alaisvuorovaikutussuhteesta. Opinnäytetyössä systemaattisen kirjallisuuskatsauksen aineistona on 48 englanninkielistä johtaja-alaisvuorovaikutussuhdetta tarkastelevaa tutkimusartikkelia, jotka kartoitettiin viestinnän ja sen lähitieteiden t…