OCTA-COORDINATED ENVIRONMENT FOR AG- X-RAY CRYSTAL-STRUCTURE OF THE COMPLEX BETWEEN TRIBENZOPYRIDINO-15-CROWN-5 AND SILVER-NITRATE (2( INVOLVING AN N2O6 DONOR SET OF 2 SANDWICHED PYRIDINO CROWNS )1)/

The single crystal X-ray analysis of the 2:1 complex between tribenzop yridino-15-crown-5 (1) and AgNO3 is reported. Crystals of the complex are triclinic, P1BAR, with a = 13.182(1), b = 13.612(2), c = 12.720(1) angstrom, alpha = 105.39(1), beta = 99.96(1), gamma = 103.04(1)-degre es and D(c) = 1.54 g cm-3 for Z=2. The Ag+ cation forms a charge separ ated sandwich structure where Ag+ is in an octa-coordinated environmen t involving two nitrogen and six oxygen atoms of the macrorings. The c omplex has a complete hydrophobic shell.