Nonhelical heterometallic [Mo₂M(npo)₄(NCS)₂] string complexes (M = Fe, Co, Ni) with high single-molecule conductance

Abstract

Using the planar 1,8-naphthyridin-2(1H)-one (Hnpo) ligand, novel nonhelical HMSCs [MoM(npo)(NCS)] (M = Fe, Co, Ni) were synthesised and they exhibited high single-molecule conductance.

Extraordinarily Large Ferromagnetic Coupling (J≥150 cm−1) by Electron Delocalization in a Heterometallic Mo≣Mo−Ni Chain Complex

“…We have found Mo≣Mo−M(dpa) 4 X 2 compounds to be more chemically robust than their Cr≣Cr−M(dpa) 4 X 2 counterparts, which are unstable to chemical oxidation . Additionally, a recent report of unusually large single molecule conductance behavior of Mo≣Mo−Ni(npo) 4 (NCS) 2 (Hnpo=(1,8‐naphthyridin‐2(1 H )‐one) prompts an investigation into the electronic structures of Mo≣Mo−Ni chain compounds. Oxidation of M A ≣M A −M B HEMACS with M A =Mo has been proposed to remove an electron from the Mo 2 δ‐bonding orbital but until this report, we have been unable to stabilize such an oxidized complex .…”

Revisit of trinickel metal string complexes [Ni3L4X2] (L = dipyridylamido, diazaphenoxazine; X = NCS, CN) for quantum transport

“…Metal string complexes (e.g., trinickel strings in Figure ) are a string of metal atoms supported by the coordination of four equatorial ligands, resembling miniaturized nanowires with the metal string shrouded by a relatively insulating layer . Reported metal string complexes include those with the metal atoms composed of the same element, defected atom chains where one of the metal centers is missing from the 1‐D coordination sites, and mixed elements in which the positions of the metal elements can be designated . A range of coordinating groups (e.g., amido, pyridyl, naphthyridyl, anthyridinyl, and thiophenyl) are formulated as the equatorial ligands .…”

“…Reported metal string complexes include those with the metal atoms composed of the same element, defected atom chains where one of the metal centers is missing from the 1‐D coordination sites, and mixed elements in which the positions of the metal elements can be designated . A range of coordinating groups (e.g., amido, pyridyl, naphthyridyl, anthyridinyl, and thiophenyl) are formulated as the equatorial ligands . Their electronegativity and rigidity exhibit significant effects on the oxidation number of the metal center and the metal–metal distance associated with the ligand–metal–metal–ligand torsion angle .…”

“…A range of coordinating groups (e.g., amido, pyridyl, naphthyridyl, anthyridinyl, and thiophenyl) are formulated as the equatorial ligands . Their electronegativity and rigidity exhibit significant effects on the oxidation number of the metal center and the metal–metal distance associated with the ligand–metal–metal–ligand torsion angle . The equatorial and axial ligands have a significant influence of metal string complexes on the spin multiplicity and magnetism .…”

Two Four‐Coordinate and Seven‐Coordinate CoII Complexes Based on the Bidentate Ligand 1, 8‐Naphthyridine Showing Slow Magnetic Relaxation Behavior

“…Metal complexes based on 1, 8-naphthyridine (napy) and its derivativesb ear versatile and unique coordination modes, which can play vital roles in catalyst, [19] solare nergy conversion, [20] single-molecule conductance, [21] and so on. Compared to the coordination modes of the common bidentate Na tom ligands2 ,2'-bipyridine (bpy) and 1,10-phenanthroline( phen), napy can be functioned as three coordination modes including (i)monodentate;( ii)bidentate and (iii)dinuclear bridging mode ( Figure 1).…”