Polynuclear paddle-wheel copper(II) propionate with di-2-pyridylamine or 1,10-phenanthroline: Preparation, characterization and X-ray structure

The synthesis, spectroscopic, magnetic and structural characterization of two new polynuclear copper(II) propionate are described. Both compounds exhibit the typical paddle-wheel type structure. The complex [Cu-4(dpyam)(2)(OCOC2H5)(2)(mu-O2CC2H5)(6)(H2O)(2)][Cu-2 mu-O2CC2H5)(4)(H2O)(2)] center dot(DMF)(2) 1; where dpyam = di-2-pyridylamine, the outer Cu ions, with a CuN2O2O' chromophore, have an intermediate five-coordinate geometry. The inner Cu ions, with a CuO4O' chromophore, have a square pyramidal geometry. The two Cu(H) ions in the inner unit are bridged by four syn,syn-eta(1):eta(1):mu propionates, showing the paddle-wheel cage type. The outer and inner linked by propionate bridges showing syn,anti-eta(1):eta(1):mu coordination mode. The 1D structure of complex [Cu-6(phen)(2)(H2O)(2)( mu-O2CC2H5)(12)](n)[Cu-2(mu-O2CC2H5)(4)(H2O)(2)](2n)center dot(H2O)(0.5n) 2; where phen = 1,10-phenanthroline, consists of zig-zag chains of mononuclear Cu(mu-O2CC2H5)(2)(H2O)(phen) repeating units running along the b-axis, which are connected along the unit cell diagonal via Cu-2(mu-O2CC2H5)(4) paddle-wheel dinuclear units. Within mononuclear and dinuclear units, the Cu(II) ions have a square pyramidal geometry. However, the outer sphere of both compounds consists of the Cu-2(mu-O2CC2H5)(4)(H2O)(2) paddle-wheel molecule in which Cu(II) ions involve a square pyramidal geometry. (C) 2007 Elsevier B.V. All rights reserved.