Abstract
Dinuclear nickel(II) complexes of two tetraaminodiphenol macrocyclic ligands in which one (H2L1) has two –NH(CH2)3NH– units and the other (H2L2) contains one –NH(CH2)3NH– and one –NH(CH2)2NH– moiety have been studied. In the inclusion complex [Ni2L1(H2O)4][ClO4]2·4NH2CONH21, both metal centres are in octahedral configuration. On reaction with pyridine (py), complex 1 transforms into the square-pyramidal complex [Ni2L1(py)2][ClO4]2. The macrocycle H2L2 forms the mixed spin-state complex [Ni2L2(H2O)2]I22 in which one metal centre is square planar and the other octahedral. On reaction with pyridine, complex 2 produces the square-planar–square-pyramidal complex [Ni2L2(py)]I24; the low-spin Ni2+ of both 2 and 4 is accommodated by the smaller N2O2 cavity provided by the phenolic oxygens and –NH(CH2)2NH– nitrogens. The redox properties of complexes 1 and 2 have been studied by cyclic voltammetry and their crystal structures determined. Complex 1: a= 7.530(1), b= 26.499(3), c= 11.434(1)A, β= 96.89(1)°, Z= 2, R= 0.051 and R′= 0.059. Complex 2: a= 11.386(1), b= 20.094(2), c= 13.158(1)A, β= 102.16(1)°, Z= 4, R= 0.050, R′= 0.059.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Chemical Society, Dalton Transactions
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
