Nickel(II) complexes with bridged polyamines

Tailoring a bio-based adsorbent for sequestration of late transition and rare earth elements

“…The bond to hydrating the water molecule is considerably longer, Ni(1)-O(1B) 2.201(5) Å, which is a commonly observed feature. Bonding within the Ni(TAEA) fragment is comparable with that observed earlier in the structures of Ni(II) with this ligand such as Ni(TAEA)(NO 3 ) 254 and [Ni 3 (TAEA) 4 (H 2 O) 2 (TMEDA) 2 ]Cl 6 59. In these latter structures, the nature of bonding was very analogous with essentially equal bonds to the five neighbours, four N-atoms of the TAEA ligands in both cases (Ni-N 2.055-2.095 and 2.080-2.117 Å respectively) and one more atomeither an O-atom in one of the nitrate ligands or a N-atom of the additional TMEDA ligand (2.075 Å in both cases).…”

“…Bonding within the Ni(TAEA) fragment is comparable with that observed earlier in the structures of Ni( ii ) with this ligand such as Ni(TAEA)(NO 3 ) 2 54 and [Ni 3 (TAEA) 4 (H 2 O) 2 (TMEDA) 2 ]Cl 6 . 59 In these latter structures, the nature of bonding was very analogous with essentially equal bonds to the five neighbours, four N-atoms of the TAEA ligands in both cases (Ni–N 2.055–2.095 and 2.080–2.117 Å respectively) and one more atom – either an O-atom in one of the nitrate ligands or a N-atom of the additional TMEDA ligand (2.075 Å in both cases). The sixth bond is much longer and stays for bonding either to an oxygen atom in an additional nitrate ion or to that in a water molecule.…”

“…The single crystal X-ray study revealed a molecular structure (see Fig. 59 . In these latter structures the nature of bonding was very analogous with essentially equal bonds to the five neighbours, four N-atoms of the TAEA ligands in both cases (Ni-N 2.055-2.095 and 2.080-2.117 Å respectively) and to one more atom -either O-atom in one of the nitrate ligands or N-atom of the additional TMEDA ligand (2.075 Å in both cases).…”

Synthesis and crystal structure of bis[μ-N,N-bis(2-aminoethyl)ethane-1,2-diamine]bis[N,N-bis(2-aminoethyl)ethane-1,2-diamine]-μ4-oxido-hexa-μ3-oxido-octa-μ2-oxido-tetraoxidotetranickel(II)hexatantalum(V) nonadecahydrate

“…However, the crystal structure of a similar complex, viz. [Ni 3 ((-tren) 2 (tren) 2 (H 2 O) 2 ] 6+ was reported previously(Matelkova ´et al, 2013).…”