Dithiosquarate (dtsq) complexes of nickel(II). Syntheses and crystal structures of [Ni(phen)2(1,2-dtsq)]·3.5H2O, [Ni(phen)2(1,3-dtsq)] and [Ni(tren)(1,2-dtsq)] [phen=1,10-phenanthroline; tren=tris(2-aminoethyl)amine]

Structure, Spectra, and DFT Simulation of Nickel Benzazolate Complexes with Tris(2-aminoethyl)amine Ligand

“…The oxygen atom of the benzazolate (O1) is in an equatorial position. The Ni–N tren bond distances (2.102–2.162 Å) are within the range reported for complexes containing the [Ni­(tren)] moiety. − The Ni–N1 bond distances are 2.063, 2.087, 2.099 Å for complexes 1 , 2 , and 3 , respectively. The bond distances Ni–O1 are 2.093, 2.034, and 2.071 Å for 1 , 2 , and 3 , respectively.…”

Bis{2-[N,N-bis(2-aminoethyl)amino]ethanaminium}nickel(II) hexacyanidoferrate(II)

“…The mean Ni-N bond length of of 2.129 (2)Å is in the normal range (Barkigia et al, 1999). The N-Ni-N chelate bite angles in (I) are comparable to those of other Ni II complexes with the tris(2-aminoethyl)amine ligand (Calatayud et al, 2003). The Fe-C bond lengths in (I) are slightly shorter than those observed in [Zn(C 4 (Razak et al, 2000).…”

(Acetonitrile)bis(1,10-phenanthroline)copper(II) bis(perchlorate)

“…Copper has been recognized as an essential trace element for living organisms since the late 1930s (Linder, 2001). 1,10-Phenanthroline (phen) is a chelating ligand with high affinity for metal ions (Calatayud et al, 2003;Devereux et al, 1999). Furthermore, Cu II complexes of phen and its derivatives have attracted great attention because they exhibit numerous biological activities such as antitumor, anti-Candida, antimycobacterial and antimicrobial (Sigman & Perrin, 1993;Schaeffer et al,1996;Mahadevan & Palaniandavar, 1998;Zoroddu et al, 1996;Ranford & Sadler, 1993;Geraghty et al, 1999;Saha et al, 2004).…”