
TY  - JOUR
A1  - Comba, P 
A1  - Lawrance, GA 
A1  - Manning, TM 
A1  - Markiewicz, A 
A1  - Murray, KS 
A1  - Oleary, MA 
A1  - Skelton, BW 
A1  - White, AH 
T1  - Synthesis, Crystal Structure and Magnetism of a Macrocyclic Binuclear Dicopper(II) Amino Alcohol Complex From a Metal Directed Reaction Involving Formaldehyde and Nitroethane
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1990
VL  - 43
IS  - 1
SP  - 69
EP  - 78
KW  - 
UR  - https://doi.org/10.1071/CH9900069 
N2  - Condensation of the bis (1,5-diaminopentan-3-ol) dicopper (II) ion with formaldehyde and nitroethane in basic methanol yields the macromonocyclic  ligand 3,13-dimethyl-3,13-dinitro-1,5,11,15-tetraazaeicosane-8,18-diol as the dicopper (II) complex. The perchlorate salt of the binuclear complex is very strongly antiferromagnetically coupled, with the magnetic properties measured from 10-300 K identifying a singlet-triplet energy gap of -860 cm-1 and a magnetic moment at room temperature of 0.48 BM. The discrete, binuclear nature of the complex was confirmed by a crystal structure analysis of the nitrite salt, which crystallizes in the monoclinic space group C2/c, a 14.789(6), b 14.560(6), c 12.759(9)&#506;, &#946; 99.65(4)&#176;, and consists of the centrosymmetric macrocycle containing two copper ions each coordinated by two secondary nitrogen donors and two (shared) RO- groups, with water and nitrite oxygens occupying axial sites. The macrocycle donors and the copper ions are essentially coplanar. The Cu&#8230;Cu distance is 3.031(1)&#506;, with the Cu-O--Cu angle 103.6(2)&#176;. The nitro (and methyl) groups at extremities of the macrocycle are in anti dispositions. 
ER  -

