The compounds [MBr2(p-clan)(2)] (where M is Mn(II), Fe(II), Co(II), Ni(II), Cu(II) or Zn(II); p-clan = 4-chloroaniline) were synthesized and characterized by melting points, elemental analysis, thermal analysis and electronic and IR spectroscopy. The enthalpies of solution of the adducts, metal(II) bromides and 4-chloroaniline in methanol, 1.2 M aqueous HCl or 25% (v/v) 1.2 M aqueous HCl in methanol were measures and by using thermochemical cycles, the following thermochemical parameters for the adducts have been determined: the standard enthalpies for the Lewis acid/base reactions (Delta H-r degrees), the standard enthalpies of formation (Delta H-f degrees), the standard enthalpies of decomposition (ADH), the lattice standard enthalpies (Delta H-M degrees) and the standard enthalpies of the Lewis acid/base reactions in the gaseous phase (Delta H-r degrees(g)). The mean bond dissociation enthalpies of the metal (II)-nitrogen coordinated bonds ((D) over bar ((M-N))) and the enthalpies of adduct formation in the gaseous phase have been estimated. (c) 2006 Elsevier B.V.. All rights reserved.