title: ESI-MS studies of mixed-ligand Fe(II) complexes containing 1,10-phenanthroline and 1,10-phenanthroline-5,6-dione as ligands.
abstract: In order to monitor the progression of the synthesis and the separation of novel mixed-ligand iron complexes containing 1,10-phenanthroline, 1,10-phenanthroline-5,6-dione, and NCS- as ligands all products were mass analyzed by electrospray ionization ion trap MS/MS. The spectra of methanol (MeOH), acetonitrile (ACN), water, and ethanol (EtOH) solutions were collected and the results were compared. It was detected under applied electrospray ionization mass spectrometry (ESI-MS) conditions that MeOH, water, and EtOH formed solvent clusters around the free or complexed 1,10-phenanthroline-5,6-dione. Owing to the solvent-ligand hydrogen-bond formation, the solvent-ligand clusters were formed in the polar protic solvents. The number of protic solvent molecules per complex ion in cluster depended on the number of 1,10-phenanthroline-5,6-dione ligands in the complex ion. Unlike MeOH, EtOH, or water, ACN was not involved in the formation of the solvent clusters with the iron complexes containing 1,10-phenanthroline-5,6-dione as ligand. We also showed that the NCS- group under certain solvent conditions served as a bidentate ligand.
authors.affiliation: Department of Chemistry, Ruder Bosković Institute, Bijenicka cesta 54, 10002 Zagreb, Croatia. rkobetic@irb.hr
authors.forename: Renata
authors.initials: R
authors.lastname: Kobetić
authors.forename: Dubravka
authors.initials: D
authors.lastname: Gembarovski
authors.forename: Goran
authors.initials: G
authors.lastname: Baranović
authors.forename: Vesna
authors.initials: V
authors.lastname: Gabelica
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D002614:Chelating Agents / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry*; D008024:Ligands; D000432:Methanol / Q000737:chemistry; D010618:Phenanthrolines / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D014867:Water / Q000737:chemistry
chemical_list: D000097:Acetonitriles; D002614:Chelating Agents; D005296:Ferrous Compounds; D008024:Ligands; D010618:Phenanthrolines; D014867:Water; C037153:1,10-phenanthroline-5,6-dione; D000431:Ethanol; C025205:1,10-phenanthroline; D000432:Methanol; C032159:acetonitrile