TY - JOUR
T1 - Dinickel(II), dizinc(II) and dilead(II) complexes of a pyridazine- containing Schiff-base macrocycle
AU - Brandt, Carsten D.
AU - Plieger, Paul G.
AU - Kelly, Robert J.
AU - De Geest, Duncan J.
AU - Kennepohl, Dietmar K.
AU - Iremonger, Simon S.
AU - Brooker, Sally
N1 - Funding Information:
This work was supported by grants from the University of Otago and the Marsden Fund (Royal Society of New Zealand). D.K.K. thanks Athabasca University for granting him study leave. We are grateful to Professor W.T. Robinson and Dr. J. Wikaira (University of Canterbury) for the X-ray data collections.
PY - 2004/11/15
Y1 - 2004/11/15
N2 - The preparation and structure of dinickel(II), dizinc(II) and dilead(II) complexes of this (2 + 2) macrocycle are described, along with the electrochemical behaviour of the dizinc(II) complex and attempts to explore the iron(II) coordination chemistry of L1. The study of the mid-late first row transition metal co-ordination chemistry of the pyridazine-containing Schiff-base macrocycle L1 [derived from the (2 + 2) condensation of 3,6-diformylpyridazine and 1,3-diaminopropane] has been completed. Transmetallation reactions of [Pb2(4 + 4)](ClO4) 4 (1) under appropriate conditions have led to the formation of the following complexes, [Ni2L1(NCS)2(SCN)2] (3), [{Pb2L1}2(μ3-OH)2](ClO 4)6 (4), and [Zn2L1(CH3CN) 4](ClO4)4 (5 • 4CH3CN), all of which have been structurally characterised. The analogous triflate salt of 5, [Zn2L1](CF3SO3)4 (6), can only be obtained by template reaction, as transmetallation of 1 with Zn(CF 3SO3)2 • 6H2O gave 5, albeit in reduced yield. Attempts to synthesise pure [Fe2L1(CH 3CN)4](ClO4)4 (7) using the transmetallation procedure, from either [Pb2(4 + 4)](ClO 4)4 or [Zn2L1(CH3CN) 4](ClO4)4, were unsuccessful. The electrochemical studies carried out on [Zn2L1](ClO4) 4 (5) revealed multiple reduction processes and associated oxidations, but no processes corresponding to oxidation of 5.
AB - The preparation and structure of dinickel(II), dizinc(II) and dilead(II) complexes of this (2 + 2) macrocycle are described, along with the electrochemical behaviour of the dizinc(II) complex and attempts to explore the iron(II) coordination chemistry of L1. The study of the mid-late first row transition metal co-ordination chemistry of the pyridazine-containing Schiff-base macrocycle L1 [derived from the (2 + 2) condensation of 3,6-diformylpyridazine and 1,3-diaminopropane] has been completed. Transmetallation reactions of [Pb2(4 + 4)](ClO4) 4 (1) under appropriate conditions have led to the formation of the following complexes, [Ni2L1(NCS)2(SCN)2] (3), [{Pb2L1}2(μ3-OH)2](ClO 4)6 (4), and [Zn2L1(CH3CN) 4](ClO4)4 (5 • 4CH3CN), all of which have been structurally characterised. The analogous triflate salt of 5, [Zn2L1](CF3SO3)4 (6), can only be obtained by template reaction, as transmetallation of 1 with Zn(CF 3SO3)2 • 6H2O gave 5, albeit in reduced yield. Attempts to synthesise pure [Fe2L1(CH 3CN)4](ClO4)4 (7) using the transmetallation procedure, from either [Pb2(4 + 4)](ClO 4)4 or [Zn2L1(CH3CN) 4](ClO4)4, were unsuccessful. The electrochemical studies carried out on [Zn2L1](ClO4) 4 (5) revealed multiple reduction processes and associated oxidations, but no processes corresponding to oxidation of 5.
KW - Electrochemistry
KW - Macrocycle
KW - Pyridazine
KW - Schiff base
KW - Structure determination
UR - http://www.scopus.com/inward/record.url?scp=8144219690&partnerID=8YFLogxK
U2 - 10.1016/j.ica.2004.06.013
DO - 10.1016/j.ica.2004.06.013
M3 - Journal Article
AN - SCOPUS:8144219690
SN - 0020-1693
VL - 357
SP - 4265
EP - 4272
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 14
ER -