Supramolecular FeII4L₄ cage for fast ammonia sensing

Abstract

A chiral supramolecular FeII4L4 metal-organic cage able to detect NH3(g) at room temperature with fast response time and superior selectivity, which we used to monitor food safety at 4°C on fresh bacon bits.

A spin crossover FeII4L6 cage based on pyridyl-hydrazone sites

“…Also, the optical output change induced by the spin state transition is an essential parameter for a colorimetric sensor. 10,11…”

“…Also, the optical output change induced by the spin state transition is an essential parameter for a colorimetric sensor. 10,11 To date, many reported Fe II tetrahedral cages constructed from subcomponent self-assembly are LS, because pyridineimine building blocks typically set up a strong ligand field, 5,12 i.e. Fe II 4 L 1 6 (SO 4 ) 4 13 and Fe II 4 L 2 4 (NTf 2 ) 8 14 (Scheme 1).…”

“…Also, if used as a sensor material, the large cavity structure could greatly increase the diffusion rate of sensing molecules, thus improving the response time of the sensor. 11 Further studies on the effect of functional groups and counter anions on the spin crossover profile and transition temperature and the sensing ability are therefore anticipated.…”

Room temperature light induced spin state switching in a FeII coordination polymer featuring a photo responsive anion

“…[1][2][3] Among all the SCO compounds, Fe II coordination compounds are attracting interest since the spin state change takes place between a diamagnetic and paramagnetic state, thanks to the d 6 electronic configuration of the metal ion. 1,2 Due to their SCO behaviour, Fe II compounds may be suitable in photomagnetism, 4 data storage, 5 charge transport, [6][7][8][9] sensors, [10][11][12][13][14][15][16] display devices, 5 etc. SCO is usually induced thermally in materials which restricts their practical use for commercial devices.…”

Spin Crossover Induced by Changing the Identity of the Secondary Metal Ion from PdII to NiII in a Face-Centered FeII8MII6 Cubic Cage

“…The design and assembly of discrete polynuclear materials that incorporate an internal cavity remains an active goal in metallosupramolecular chemistry. 1,2 Such molecules have shown potential in a range of applications which take advantage of host-guest interactions, including sensing, [3][4][5][6] catalysis, [7][8][9][10] drug encapsulation 11,12 and the selective uptake of guest molecules [13][14][15][16] . In addition, there has been continuing interest in the construction of new cage systems as photoactive [17][18][19] and magnetic materials, 20 with the latter including spin crossover (SCO) systems.…”