Active metal template synthesis of a neutral indolocarbazole-containing [2]rotaxane host system for selective oxoanion recognition

A "click" active-metal-template strategy has been exploited to develop mono- and bi-2,2′,6′,2″-terpyridine functionalised [2]rotaxanes. When reacted with Fe(ii) ions these rotaxanes formed metallo-bis-([2]rotaxanes), macrocycles and oligomers.

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Active Metal Template Synthesis and Thermal Actuation of a Nanohoop [c2]Daisy Chain Rotaxane

10.26434/chemrxiv.11663754.v1 ◽

2020 ◽

Author(s):

Jeff Van Raden ◽

Nanette N. Jarenwattananon ◽

Lev N. Zakharov ◽

Ramesh Jasti

Keyword(s):

Metal Ions ◽

Template Synthesis ◽

Large Amplitude ◽

Local Environment ◽

New Approach ◽

Thermal Actuation ◽

Active Metal ◽

Thermal Changes ◽

Template Methods ◽

Expanded Form

<p>Molecules and materials that demonstrate large amplitude responses to minor changes in their local environment play an important role in the development of new forms of nanotechnology. Molecular daisy chains are a type of a mechanically interlocked molecule that are particularly sensitive to such changes where, in the presence of certain stimuli, the molecular linkage enables muscle-like movement between a reduced-length contracted form and an increased-length expanded form. To date, all reported syntheses of molecular daisy chains are accomplished via passive-template methods, resulting in a majority of structures being switchable only through the addition of an exogenous stimuli such as metal ions or changes in pH. Here, we describe a new approach to these structural motifs that exploits a multi-component active-metal template synthesis to mechanically interlock two pi-rich nanohoop macrocycles into a molecular daisy chain which we show can be actuated through simple thermal changes.</p>

Download Full-text

Active Metal Template Synthesis and Thermal Actuation of a Nanohoop [c2]Daisy Chain Rotaxane

10.26434/chemrxiv.11663754 ◽

2020 ◽

Author(s):

Jeff Van Raden ◽

Nanette N. Jarenwattananon ◽

Lev N. Zakharov ◽

Ramesh Jasti

Keyword(s):

Metal Ions ◽

Template Synthesis ◽

Large Amplitude ◽

Local Environment ◽

New Approach ◽

Thermal Actuation ◽

Active Metal ◽

Thermal Changes ◽

Template Methods ◽

Expanded Form

<p>Molecules and materials that demonstrate large amplitude responses to minor changes in their local environment play an important role in the development of new forms of nanotechnology. Molecular daisy chains are a type of a mechanically interlocked molecule that are particularly sensitive to such changes where, in the presence of certain stimuli, the molecular linkage enables muscle-like movement between a reduced-length contracted form and an increased-length expanded form. To date, all reported syntheses of molecular daisy chains are accomplished via passive-template methods, resulting in a majority of structures being switchable only through the addition of an exogenous stimuli such as metal ions or changes in pH. Here, we describe a new approach to these structural motifs that exploits a multi-component active-metal template synthesis to mechanically interlock two pi-rich nanohoop macrocycles into a molecular daisy chain which we show can be actuated through simple thermal changes.</p>

Download Full-text