Hydrogen bond-induced abrupt spin crossover behaviour in 1-D cobalt(ii) complexes – the key role of solvate water molecules

Abstract

The magnetic properties and structural aspects of 1-D Co(ii) complexes, [Co(pyterpy)Cl2]·2H2O (pyterpy: 4′-(4′′′-pyridyl)-2,2′:6′,2′′-terpyridine) and [Co(pyethyterpy)Cl2] (pyethyterpy: 4′-((4′′′-pyridyl)ethynyl)-2,2′:6′,2′′-terpyridine) are reported.

Hydrogen-bonded cobalt(ii)-organic framework: normal and reverse spin-crossover behaviours

“…Cobalt(II)-SCO compounds can exhibit a sensitive response toward the absorption/desorp-tion of guest molecules. [35][36][37][38][39][40] SCO-active Co-tpy complexes may act as switching components that are compatible with porous architectures such that functional materials may be developed.…”

Construction of spin-crossover dinuclear cobalt(ii) compounds based on complementary terpyridine ligand pairing

“…33,34 The design of multinuclear or polymeric structures is a practical approach for increasing cooperativity because the molecular interaction and structural change can be amplified through the increase of the nuclear number in one molecule. [35][36][37][38][39] It is anticipated that the rational design of welldefined multinuclear SCO compounds can lead to elevated magnetic properties. To the best of our knowledge, there is only one report on a spin-crossover dinuclear cobalt(II) compound constructed from a terpyridine type ligand.…”

Multi-TpyCo2+-based conductive supramolecular hydrogels constructed by “bridge bonds” for rechargeable Zn-air batteries with ultrastable cycling stability over 1100 h

“…Typically, supramolecular hydrogels are constructed by the hydrogen bond and p-p interaction between (Tpy) x Co x Cl 2x complexes as the driving force (Scheme 1). 32,33 In detail, it is noteworthy that the hydrogen bond between the Cl À ion and H 2 O molecules within the complexes is considered as the "bridge bond" to connect two complexes together, which then expands innitely to form a 3D network structure. Consequently, the obtained (Tpy) x Co x (x ¼ 2-4) complexes possess excellent self-healing and remolding properties.…”