Chloride-bridged Ni(II) complexes with ferromagnetic exchange interaction from thiazoline hydrazone derivative ligands

Magneto‐structural Studies in Double Chloro‐ and Pseudohalo‐bridged Isomorphic Dinickel(II) Complexes

“…Previous studies on doubly chloro-bridged Ni(II) dimers showed that the magnetic interaction are predominantly ferromagnetic if the geometry of the metal centre is octahedral (Table 3), [26,[47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] and the strength of the coupling varies from 3.48 to 14.59 cm À 1 , with only one exception where AF interaction is operative between the metal centres with high degree of distortion of Ni(II) centres from the octahedral geometry. [64] Tamayo et al have established that the strength of the ferromagnetic coupling become weaker with increase of the bridging angle from ideal value of 90°.…”

“…Our data provide us information that chloride (J = 6.84(10) cm À 1 ) is better magnetic coupler than cyanate ion (J = 5.31(4) cm À 1 ). If we look at the reported results, it is seen that J values (considering Ĥ = À 2JŜ 1 ⋅Ŝ 2 ) vary from 1.91 to 43.9 cm À 1 in doubly μ 1,1 -azido-bridged dinickel(II) complexes, [13][14][15][16][17][18][19][20][31][32][33][35][36][37][38][39][40][41][42][43][44][45][46] while the ranges are 1.7 to 6.85 cm À 1 [19,21,24] and 3.48 to 14.59 cm À 1 [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] for doubly μ 1,1cyanato-bridged and doubly μ-chloro-bridged analogues, respectively, and the trend of their average values is exactly replicated in the present study, that help us to conclude that μ 1,1 -azido is superior magnetic exchanger among them, followed by μ-chloro and μ 1,1 -cyanato.…”

{4-Phenyl-1-[1-(1,3-thiazol-2-yl)ethylidene]thiosemicarbazidato}{4-phenyl-1-[1-(1,3-thiazol-2-yl)ethylidene]thiosemicarbazide}nickel(II) chloride monohydrate

“…For general background to thiosemicarbazones and their metal complexes, see: Haiduc & Silverstru (1990); Nath et al (2001); Padhye & Kauffman (1985); Pellerito & Nagy (2002); Ali & Livingstone (1974); Barros-García et al (2005); Campbell (1975). For related structures, see: Ketcham et al (2002); Lima et al (1999); Viñ uelas-Zahínos et al (2008); Saeed et al (2009); Venkatraman et al (2009).…”

Synthesis, Spectral and Antibacterial Studies of Co(II), Ni(II), Cu(II) and Zn(II) Complexes with Acetone Acetyl hydrazone

“…Hydrazones are promising ligands from the view point of coordination chemistry because of their ability towards complexation with transition and non-transition metals (Raveendran and Pal, 2009;Galic et al, 2011;Matoga et al, 2012), and the wide range of biological and non-biological properties (Matoga et al, 2011;Suvarapu et al, 2012;Mackova et al, 2012). Among the ligand systems, hydrazones occupy a special place because many transition metal complexes of these ligands have been developed due to their chelating capabilities, structural flexibility, interesting electrical as well as magnetic properties (Rao et al, 1997;Vinuelas-Zahinos et al, 2009;Galic et al, 2011;Sadhukhan et al, 2011;Matoga et al, 2012;Datta et al, 2012). Due to short N-N bond length, the hydrazone ligands act mostly as bidentate (NO) moieties although they have the potential to act as tridentate ligands (ONN) in ligand systems containing groups having other donor sites (e.g., Heterocyclic rings) (Jang et al, 2005).…”

“…On the other hand, coordination compounds of aromatic hydrazones have been thoroughly investigated, in contrast, metal complexes based on aliphatic hydrazones (Vinuelas-Zahinos et al, 2009;Sadhukhan et al, 2011;Datta et al, 2012) are yet to be explored. Herein we report a number of acetone acetylhydrazone complexes with various transition metal salts.…”