Aromi, Guillem published the artcileA systematic exploration of nickel-pyrazolinato chemistry with alkali metals: New cages from serendipitous assembly, Synthetic Route of 27412-71-1, the main research area is crystal structure alkali metal nickel pyrazolinolato pivalato multinuclear cluster; alkali metal nickel pyrazolinolato pivalato multinuclear cluster preparation structure; magnetic property nickel pyrazolinolato pivalato multinuclear cluster.
The preparation and properties of fourteen novel paramagnetic [NiIIx] aggregates bridged by pivalate, pyrazolinolate and in most cases hydroxide are reported. A rich structural diversity was achieved by changing the nature of the alkali of the base used during the synthesis, leading to the nuclearities [NiII4NaI4] (2, 3, 4), [NiII5NaI4] (5, 6, 7), [NiII5LiI6] (8), [NiII8MI2] [M = K (9, 10), Rb (11, 12), Cs (13, 14)] and [NiII8] (15). All compounds were characterized by single-crystal x-ray diffraction; however, full crystallog. details are given only for the representative mols. [Ni4Na4(fpo)4(piv)8(Hpiv)8] (2), [Ni5Na4(OH)2(mpo)4(piv)8(Hpiv)2(MeCN)2] (5), [Ni5Li6(OH)2(fpo)2(piv)12(Hpiv)4] (8), [Ni8K2(OH)4(ppo)4(piv)10(Hppo)2(Hpiv)2(MeCN)2] (9), [Ni8Rb2(OH)4(ppo)4(piv)10(Hppo)2(Hpiv)2(MeCN)2] (11), [Ni8Cs2(OH)4(ppo)4(piv)10(Hppo)2(Hpiv)2(MeCN)2] (13) and [Ni8(OH)4(mpo)2(PhCH2CO2)10(Hmpo)8] (15), where 5-R-3-pyrazolone [R = Me (Hmpo), Et (Hepo), CF3 (Hfpo), Ph (Hppo)]. Variable-temperature bulk magnetization measurements were performed for each type of complex. The [NiII4NaI4] clusters show intramol. antiferromagnetic coupling and a spin ground state of S = 0. [NiII5NaI4] also display antiferromagnetic superexchange, leading to an S = 1 spin ground state. The mol. with nuclearity [NiII5Li16], in contrast, exhibits ferromagnetic interactions, resulting in the presence of low energy states with high multiplicity, and a spin ground state S > 1. The [NiII8M12] and [NiII8] clusters have the same topol. of spin carriers, which display predominantly antiferromagnetic interactions to yield a diamagnetic ground state. The coupling within these octanuclear NiII clusters is rationalized in terms of the nature of the Ni-O-Ni angles within the core.
Chemistry – A European Journal published new progress about Antiferromagnetic exchange. 27412-71-1 belongs to class pyrazoles-derivatives, name is 5-Phenyl-1H-pyrazol-3(2H)-one, and the molecular formula is C9H8N2O, Synthetic Route of 27412-71-1.
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics