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24 results on '"Plajer, Alex J."'

1. Inside Back Cover: Easy Synthetic Access to High‐Melting Sulfurated Copolymers and their Self‐Assembling Diblock Copolymers from Phenylisothiocyanate and Oxetane

Author

Stephan, Jenny, primary, Olmedo‐Martínez, Jorge L., additional, Fornacon‐Wood, Christoph, additional, Stühler, Merlin R., additional, Dimde, Mathias, additional, Braatz, Daniel, additional, Langer, Robert, additional, Müller, Alejandro J., additional, Schmalz, Holger, additional, and Plajer, Alex J., additional

Published
2024
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5. The Coordination Chemistry of the N-Donor-Substituted Phosphazanes

Author

Plajer, Alex J, Bond, Andrew D, Wright, Dominic S, Bond, Andrew D [0000-0002-1744-0489], Wright, Dominic S [0000-0002-9952-3877], and Apollo - University of Cambridge Repository

Subjects
deprotonation, coordination chemistry, cyclodiphosphazane, transition metals, X-ray crystallography
Abstract

Phosph(III)azanes, featuring the heterocyclobutane P2 N2 ring, have now been established as building blocks in main-group coordination and supramolecular compounds. Previous studies have largely involved their use as neutral P-donor ligands or as anionic N-donor ligands, derived from deprotonation of amido-phosphazanes [RNHP(μ-NR)]2 . The use of neutral amido-phosphazanes themselves as chelating, H-bond donors in anion receptors has also been an area of recent interest because of the ease by which the proton acidity and anion binding constants can be modulated, by the incorporation of electron-withdrawing exo- and endo-cyclic groups (R) and by the coordination of transition metals to the ring P atoms. We observed recently that the effect of P,N-chelation of metal atoms to the P atoms of cis-[(2-py)NHP(μ-Nt Bu)]2 (2-py=2-pyridyl) not only pre-organises the N-H functionality for optimum H-bonding to anions but also results in a large increase in anion binding constants, well above those for traditional organic receptors like squaramides and ureas. Here, we report a broader investigation of ligand chemistry of [(2-py)NHP(μ-t NBu)]2 (and of the new quinolyl derivative [(8-Qu)NHP(μ-Nt Bu)]2 (8-Qu=8-quinolyl). The additional N-donor functionality of the heterocyclic substituents and its position has a marked effect on the anion and metal coordination chemistry of both species, leading to novel structural behaviour and reactivity compared to unfunctionalized counterparts.

Published
2020
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18. Flexible Bonding of the Phosph(V)azane Dianions [S(E)P(μ‐NtBu)]22−

Author

Plajer, Alex J. and Plajer, Alex J.

Abstract

Producción Científica, Oxidation of the PIII dianion [S−P(μ‐NtBu)]22− (1) with elemental sulphur, selenium and tellurium gives the PV dianions [(S)(E)P(μ‐NtBu)]22− (E = S (6 a), Se (6 b), Te (6 c)). Although 6 c proves to be too unstable, the S,S‐dianion 6 a and ambidentate S,Se‐dianion 6 b are readily transferred intact to main group and transition metal elements, producing a range of new cage and coordination compounds. While their coordination characteristics are in many ways similar to closely‐related isoelectronic phosph(V)azane anions [(E)(RN=)P(μ‐NtBu)]22−, the sterically unhindered nature of 6 introduces an expanded range of coordination modes, that is, facial S,S‐ and Se,Se‐bonding as well as side‐on S,Se‐coordination. All of these bonding modes are observed for the amibidentate S,Se dianion 6 b., 2019-04-04, Ministerio de Economía, Industria y Competitividad - Agencia Estatal de Investigación (AEI), European Social Fund (ESF), Ramon y Cajal contract (RG-R, RYC-2015 -19035 )

Published
2018

19. How Changing the Bridgehead Can Affect the Properties of Tripodal Ligands

Author

Plajer, Alex J. and Plajer, Alex J.

Abstract

Producción Científica, Although a multitude of studies have explored the coordination chemistry of classical tripodal ligands containing a range of main‐group bridgehead atoms or groups, it is not clear how periodic trends affect ligand character and reactivity within a single ligand family. A case in point is the extensive family of neutral tris‐2‐pyridyl ligands E(2‐py)3 (E=C−R, N, P), which are closely related to archetypal tris‐pyrazolyl borates. With the 6‐methyl substituted ligands E(6‐Me‐2‐py)3 (E=As, Sb, Bi) in hand, the effects of bridgehead modification alone on descending a single group in the periodic table were assessed. The primary influence on coordination behaviour is the increasing Lewis acidity (electropositivity) of the bridgehead atom as Group 15 is descended, which not only modulates the electron density on the pyridyl donor groups but also introduces the potential for anion selective coordination behaviour., 2019-04-04, Ministerio de Economía, Industria y Competitividad - Agencia Estatal de Investigación (AEI), European Social Fund (ESF), Ramón y Cajal contract (RG-R, RYC-2015–19035), The Leverhulme Trust (Grant for DSW and RG-R, postdoctoral fundng for ALC), The Cambridge Trust (Vice Chancellor Scholarship for AJP, Cambridge Australia Scholarship for FJR) , ZEDAT and FU Berlin (PP)

Published
2018

24. A Modular Approach to Inorganic Phosphazane Macrocycles

Author

Plajer, Alex J., primary, García-Rodríguez, Raúl, additional, Benson, Callum G. M., additional, Matthews, Peter D., additional, Bond, Andrew D., additional, Singh, Sanjay, additional, Gade, Lutz H., additional, and Wright, Dominic S., additional

Published
2017
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