A Novel One-Dimensional Cyano-Bridged Ni₃Fe₂ Ferromagnet Constructed from Bimetallic Molecular Squares

Abstract

Reaction of the complex [Ni(rac-CTH)](2+) (rac-CTH = rac-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) with [Fe(CN)(6)](3-) leads to a novel cyano-bridged Ni(3)Fe(2) complex, [[Ni(rac-CTH)](3)[Fe(CN)(6)](2)](4). The structure consists of an alternating arrangement of [Fe(CN)(6)Ni(rac-CTH)](2) squares and trans-planar [Ni(rac-CTH)](2+) units bridged by cyanide groups to give a neutral 1D chain running along the a axis. Magnetic measurements reveal the occurrence of ferromagnetic coupling between Fe(III) and Ni(II) ions and 3D magnetic ordering at 3 K due to interchain interactions. Canting of the moments is inferred from the low value of the magnetization of the saturation below T(c).

A heterometallic polymeric complex: [Cu2(N3)2(medpt)2{Ni(CN)4}]n[medpt is bis(3-aminopropyl)methylamine]

“…Ag(CN) 2À , Cu(CN) 3 2À , Au(CN) 4 À , M(CN) 4 2À (M is Ni II , Pt II and Cd II ) and M(CN) 6 3À (M is Cr III , Fe III , etc.) (Iwamoto, 1996;Bowmaker et al, 1998;Chesnut & Zubieta, 1998;Falvello & Tomas, 1999;Mondal et al, 2000;Du et al, 2000;Niel et al, 2001;Shorrock et al, 2003;Colacio et al, 2003), behave as bridging moieties to build a multidimensional structure with a second coordination centre, and the resulting complexes demonstrate unique magnetic, host±guest and other properties.…”

A novel three-dimensional copper(I) cyanide coordination polymer constructed from various bridging ligands: synthesis, crystal structure and characterization

“…Hence, the cyanide anion exhibits versatile bridging abilities, such as terminal, 2 -C:N, 3 -C:C:N, 3 -C:C:N dimer and 4 -C:C:N:N modes ( Fig. 1) (Jia & Hou, 2012;Qin et al, 2016a,b;Liang et al, 2008;Colacio et al, 2003;Kaase et al, 2014). Up to now, the first four bridging modes have been used to synthesize one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) cuprous cyanide networks, according to the literature (Shen, 2014;Bayse et al, 2009;Qin et al, 2011Qin et al, , 2017Meng et al, 2012;Chesnut et al, 2001).…”

Synthesis, characterization and magnetic properties of cyanide bridged 1-D metal-coordination polymers based on [FeIII(s-bqdi)2(CN)2]−

“…Magnetic interactions between nearest non-equivalent neighbor spin carriers may be ferromagnetic or antiferromagnetic with non-compensation of the local spin. Molecular magnets synthesized by substitution of four out of six CN À ligands of hexacyanoferrate by two bidentate ligands have been reported by Colacio et al [47]. Magnetic studies of chain-like [Mn(salpn)][Fe(bipy)(CN) 4 ] reveal the presence of weak antiferromagnetic interactions between adjacent Fe III and Mn III ions [48].…”