NEW MACROCYCLIC DIOXOTETRAAMINES BEARING 2-PYRIDYLMETHYL AS FUNCTIONAL DONOR PENDANT(S) - SYNTHESIS, PROPERTIES AND CRYSTAL-STRUCTURE OF THEIR COPPER(II) COMPLEXES
Xh. Bu et al., NEW MACROCYCLIC DIOXOTETRAAMINES BEARING 2-PYRIDYLMETHYL AS FUNCTIONAL DONOR PENDANT(S) - SYNTHESIS, PROPERTIES AND CRYSTAL-STRUCTURE OF THEIR COPPER(II) COMPLEXES, Journal of the Chemical Society. Dalton transactions, (3), 1998, pp. 433-437
Two new macrocyclic dioxotetraamines ethy1)-1,4,7,10-tetraazacyclotrid
ecane-11,13-dione (H2L1) and 4,7-bis( pyridin-2-ylmethyl)-1,4,7,1 O-te
traazacyclotridecane-11,13-dione (H2L1) have been synthesized and char
acterized. The solution behaviors of their copper(II) complexes have b
een studied with ESR, UV/VIS and cyclic voltammetric techniques. React
ion of H2L2 with Cu(O2CMe)(2) in methanol solution yielded a doubly de
protonated dioxotetraamine copper(II) complex, [CuL2]. 6H(2)O, the str
ucture of which has been determined by X-ray diffraction analysis. The
Cu atom is five-co-ordinated by four basal nitrogens and one pendant
pyridine nitrogen, forming a distorted square pyramid in which N(21) o
f the pendant pyridine nitrogen is at the apical site. The Cu-N(21) bo
nd distance [2.203(7) Angstrom] is longer than the basal average Cu-N
bond length [1.985(4) Angstrom] due to the Jahn-Teller effect.