Mean copper-ligand binding enthalpies in copper(II) complexes of dimethylglyoxime, glycine, acetic acid and 4-phenylamino-3-penten-2-one

• Published in: Thermochimica acta 1990-04, Vol.160 (2), p.267-280
• Main Authors: Da Silva, M.A.V.Ribeiro, Da Silva, Maria D.M.C.Ribeiro, Rangel, Maria C.S.S., Pilcher, G., Akello, Margaret J., Carson, A.S., Jamea, E.H.
• Format: Article
• Language: English
• Subjects: Chemical thermodynamics; Chemistry; Exact sciences and technology; General and physical chemistry
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/0040-6031(90)80266-2

The standard enthalpies of formation of some crystalline copper(II) complexes were obtained from solution-reaction calorimetric measurements and the enthalpies of sublimation of Cu 2(acetate) 4, Cu(dmg) 2 and Cu(PhNacac) 2 were obtained from torsion-Knudsen vapour pressure measurements. The differences between the mean Cu-ligand and H-ligand dissociation enthalpies were derived and are given below. a Complex a Δ f H m XXX(cr)(kJmol −1) Δ H m XXX(sub)(kJmol −1) t̄ D(Cu-L)- D(H-L)(kJmol −1) Cu 2(acetate) 4 −1765.8 ± 2.7 106.1 ± 0.9 −67.1 ± 1.8 Cu(dmg) 2 −171.5 ± 2.3 93.1 ± 0.8 −63.7 ± 1.8 Cu(PhNacac) 2 −174.3 ± 2.7 128.1 ± 0.8 −92.3 ± 3.7 Cu(gly) 2 −940.8 ± 1.7 111 ± 15 −26.3 ± 7.7 a Hdmg, Dimethylglyoxime; Hgly, glycine; PhNacacH, 4-phenylamino-3-penten-2-one.