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N-Bridged Acyclic Trimeric Poly-Cyclodiphosphazanes: Highly Tuneable Cyclodiphosphazane Building Blocks |
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| Authors: | Dr. Xiaoyan Shi Felix León Ying Sim Shina Quek Gavin Hum Yi Xin Joycelyn Khoo Zi Xuan Ng Mian Yang Par How Chee Ong Varun K. Singh Dr. Rakesh Ganguly Assoc. Prof. Jack K. Clegg Dr. Jesús Díaz Felipe García |
| Affiliation: | 1. School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371 Singapore School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006 Guangdong, P. R. China These authors contributed equally to this work.;2. School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371 Singapore These authors contributed equally to this work.;3. School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371 Singapore;4. School of Chemistry and Molecular Biosciences, The University of Queensland, Cooper Road, St Lucia, 4072 Queensland, Australia;5. Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria Universidad de Extremadura, Avda de la Universidad s/n, 10003 Cáceres, Spain |
| Abstract: | We have synthesized a completely new family of acyclic trimeric cyclodiphosphazane compounds comprising NH, NiPr, NtBu and NPh bridging groups. In addition, the first NH-bridged acyclic dimeric cyclophosphazane has been produced. The trimeric species display highly tuneable characteristics so that the distance between the terminal N(H)R moieties can be readily modulated by the steric bulk present in the bridging groups (ranging from ≈6 to ≈10 Å). Moreover, these species exhibit pronounced topological changes when a weak non-bonding NH⋅⋅⋅π aryl interaction is introduced. Finally, the NH-bridged chloride binding affinities have been calculated and benchmarked along with the existing experimental data available for monomeric cyclodiphosphazanes. Our results underscore these species as promising hydrogen bond donors for supramolecular host–guest applications. |
| Keywords: | anion sensing hydrogen bonding phosphazanes steric tuning trimers |