Di-μ-chloro-bis{[tris(2-pyridylmethyl)amine-κ⁴N]nickel(II)} bis(triethylammonium) tetraperchlorate

First Row Divalent Transition Metal Complexes of Aryl-Appended Tris((pyridyl)methyl)amine Ligands: Syntheses, Structures, Electrochemistry, and Hydroxamate Binding Properties

“…The Ni(II) center exhibits an octahedral geometry, with the two phenyl-substituted pyridyl donors bound in a trans orientation. The Ni−N py bond lengths for the phenyl-substituted pyridyl donors (Ni−N PhPy , 2.200(5), 2.218(5) Å) in 3·CH 3 OH are elongated with respect to the unsubstituted pyridyl donor (2.065(4) Å) in the same complex and Ni−N Py distances in a variety of Ni(II) complexes of the parent TPA ligand (av Ni−N py ∼2.08 Å) . However, the average Ni−N Py distance in 6-Me 3 -TPA Ni(II) derivatives (2.215 Å) matches well with the Ni−N PhPy distances in 3·CH 3 OH .…”

Two distinct tetranuclear motifs, rectangular vs. extended, are observed for complexes of a bis-tetradentate pyrimidine-based ligand

“…The intramolecular Ni/Ni distance across the chloride bridges in 3 0 [3.543(1) Å] is longer than that observed in [Ni II 4 (L Et ) 2 (F) 4 ](BF 4 ) 4 $4MeOH [3.176(3) Å], probably due to the larger size of chloride ions compared to uoride ions, whereas that across the pyrimidine bridges [6.695(1) Å] is shorter than 2) , respectively [49][50][51][52][53] ].…”

trans-Diaquabis(N,N-dimethylethane-1,2-diamine-κ2N,N′)nickel(II) dichloride dihydrate: a redetermination at 90 K

“…We have reported magneto-structural studies of nickel(II) dimers containing the {NiX} 2 core, where X is Cl and Br (Tong et al, 1999(Tong et al, , 2000Xie & Norman, 2006), and observed that a bridging bromide mediates stronger ferromagnetic coupling between six-coordinate nickel(II) centers than does a bridging chloride for the same effective ferromagnetic coupling pathway. We do not know if this observation is general since very few compounds containing the {NiBr} 2 core, with sixcoordinate nickel(II), have been reported.…”