Synthesis and characterisation of a {Ni8} single molecule magnet and another octanuclear nickel cage

Abstract

Two new octanuclear nickel(II) cage complexes are reported; the second is a new single molecule magnet.

Topological insights in polynuclear Ni/Na coordination clusters derived from a schiff base ligand

“…The interest in polynuclear Ni(II) coordination chemistry was first captured when the first Ni(II)-based SMM, a Ni 12 complex, was reported in 2001 by Cadiou et al [24]. Ever since, there have been a number of homometallic polynuclear Ni II CCs with high nuclearities including, Ni 5 [7,25], Ni 6 [26], Ni 7 [27,28], Ni 8 [29][30][31][32], Ni 9 [33,34], Ni 11 [35], Ni 12 [7], Ni 13 [36], Ni 14 [37], Ni 20 [38], Ni 21 [39], Ni 24 [40] and Ni 26 [41], and many of these display interesting magnetic properties including ferromagnetic, ferrimagnetic coupling, diamagnetism and SMM behaviour.…”

Coordination modes of 5-pyrazolones: A solid-state overview

“…Indeed, as can be seen from [36], Na [36,38], K [36], Rb [36], Cs [36], Mg [40], Sr [40], Ba [40]). In these compounds other bridging ligands (such as carboxylate, ␤-diketonate, hydroxo or oxo) contribute, along with the pyrazolone ligands, to the formation of polynuclear structures.…”

“…The pyrazolone ligands HL 2 -HL 5 , which are all substituted on C3, form metal complexes [35][36][37][38][39][40] in their neutral and deprotonated forms (see Table 1), both coexisting in many complexes. The neutral form usually coordinates to the metal through the N1 atom (Figs.…”

“…Extraction of the crude products with MeCN (or EtOAc) and slow evaporation of the solvents afforded crystalline solids in a few days. The [Ni 8 Na] cage [38] was prepared by reac- tion of an aqueous solution of nickel tetrafluoroborate with a methanolic solution of the pyrazolone (HL 2 ) and tertbutylbenzoic acid. After stirring the mixture briefly, a solution of NaOMe in MeOH was added and the solution was heated under reflux for 24 h. The solvent was then removed and the crude product was extracted with ethyl acetate.…”

Crystal structure of bis(2-(2-hydroxymethyl)pyridine-κ2 N,O)-bis(pivalato-κO)nickel(II), C22H32N2NiO6

“…However, there are few Ni(II) complexes showing SMMs effect [6][7][8][9]. Regarding the construction of complex materials, the 2-pyridinemethanol ligand has proven to be extremely versatile for the synthesis of structures due to its ability to engage simultaneously in several different coordination modes.…”