Abstract
Nickel(II)complexes with the bicyclic tetraamine L=[2 sup4.3
sup1]adamanzane, ,4,7,10- tetraaza- bicyclo[5.5.3]pentadecane)
have been synthesized. The reaction of NiBr sub 2 with [2 sup4.3
sup1]adz in dimethylformamide gives a dibromo-bridged dinuclear
complex [{Ni(L)}sub2(mu-Br)sub2]Br sub2. From this crude product
pure {Ni(L)}sub2 (mu-Br)sub2](ClO sub4)sub2 and {Ni(L)}sub 2
(mu-Cl)sub 2](ClO sub4)sub2 have been obtained. In aqueous
solution these dinuclear species hydrolyse to the parent
mononuclear diaqua species, which was isolated as [Ni(L)(H
sub2O)sub2]S sub2O sub6 x 2H sub2O. The reaction of the diaqua
complex with nitrite gives [Ni(L)(NO sub2)]ClO sub4 or [Ni(L)(NO
sub2)]PF sub6 and with nitrate [Ni(L)(NO sub3)]ClO sub4 is
obtained. Equilibrium studies of the formation of the nitrito and
nitrato complexes are reported. The structures of
[{Ni(L)}sub2(mu-Cl) sub2](ClO sub4)sub2, [Ni(L)(H sub2O)sub2]S
sub2O sub6 x 2H sub2O, [Ni(L)(NO sub2)]PF sub6 and Ni(L) (NO
sub3)]ClO sub4 have been determined by X-ray diffraction
techniques. The coordination geometry about the nickel(II) ion is
a distorted octahedron in all the structures.
Original language | English |
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Journal | Acta Chemica Scandinavica |
Volume | 53 |
Pages (from-to) | 457-464 |
Publication status | Published - 1999 |