Energetics of metal-ligand binding in copper(II) and nickel(II) complexes of two Schiff bases

• Type: Article in International Scientific Journal
• Date: 1997

Authors

da Silva, MAVR (Author) FCUP; Maria D M C R Ribeiro da Silva (Author) FCUP; Manuel J S Monte (Author) FCUP; Goncalves, JM (Author) FCUP; Fernandes, EMR (Author) Other

Journal

Title: Journal of the Chemical Society. Dalton Transactions

Pages: 1257-1262

ISSN: 1472-7773

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 29 Citations

Scopus - 36 Citations

Other information

Authenticus ID: P-001-BMP

DOI: 10.1039/a607745e

Abstract (EN): The standard molar enthalpies of formation, at 298.15 K, of crystalline copper(II) and nickel(II) complexes with 4,4'-ethylenedinitrilobis(pentan-2-one) (H(2)acacen) and with 1,1'-diphenyl-3,3'-ethylenedinitrilobis(butan-1-one) (H(2)bzacen), were determined from solution-reaction calorimetric measurements as, respectively, Delta(f)H(m)(o)[Cu(acacen), cr] = -385.1 +/- 3.2, Delta(f)H(m)(o)[Cu(bzacen), cr] = -203.4 +/- 5.1, Delta(f)H(m)(o)[Ni(acacen), cr] = -472.6 +/- 3.1 and Delta(f)H(m)(o)[Ni(bzacen), cr] = -292.2 +/- 5.1 kJ mol(-1). The standard molar enthalpies of sublimation of the same metal complexes, at 298.15 K, were obtained by effusion methods as: Delta(cr)(g)H(m)(o)[Cu(acacen) = 127.6 +/- 0.7, Delta(cr)(g)H(m)(o)[Ni(acacen)] = 129.1 +/- 0.9, Delta(cr)(g)H(m)(o)[Cu(bzacen)] = 205.6 +/- 3.0 and Delta(cr)(g)H(m)(o)[Ni(bzacen) = 201.7 +/- 2.8 kJ mol(-1). The differences between the mean metal-ligand and hydrogen-ligand bond-dissociation enthalpies were derived.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6