SOLID-SOLUTIONS IN METAL-COMPLEXES - SOLUBILITY PHASE-DIAGRAMS AND X-RAY CRYSTAL-STRUCTURES OF TRANS(N,T-N)-[CO(NORLEUCINATO)(TREN)]I-2 ANDTRANS(N,T-N)-[CO(METHIONINATO)(TREN)]I-2 [TREN=TRIS(2-AMINOETHYL)AMINE]

Ternary solubility diagrams of trans(N,t-N)-[Co(n-leu)(tren)]I-2 and t rans(N,t-N)-[Co(met)(tren)]I-2 [t-N=tertiary amine nitrogen, n-leu=nor leucinate(1-), met=methioninate(1-), and tren=tris(2-aminoethyl)-amine ] were determined at 25.0 degrees C. A single isotherm was found; the tie lines do not converge to any apexes of the enantiomers in either s ystem. The solid phases are variable over the entire region from D:L(% )=100:0 to 0:100, and both systems form a solid solution. The X-ray cr ystal structures of trans(N,t-N)-[Co(DL-n-leu)(tren)]I-2 (1; D:L=50:50 ) and trans(N,t-N)-[Co(DL-met)(tren)]I-2 (3; D:L=50:50) were determine d from 3600 and 4699 reflections to R=0.036 (R(w)=0.046) and R=0.045 ( R(w)=0.068), respectively: space group P2(1)/c with a=9.204(4), b=11.0 57(2), c=19.576(3) Angstrom, beta=95.95(2)degrees, and Z=4 for 1 and s pace group P2(1)/n with a=13.032(4), b=11.210(4), c=13.535(2) Angstrom , beta=92.62(2)degrees, and Z=4 for 3. The results confirm the co-exis tence of the D- and L-amino acidato complex ions in each site of the u nit cell in both complexes. Furthermore, the unit cell comprises two D -rich sites and two L-rich sites: The unequal occupancy of the D- and L-amino acidato complex ions in each site is found irrespective of the racemic composition.