title: Synthesis and characterization of calcium beta-diketonate complexes. X-ray crystal and molecular structures of: [{Ca(tmhd)2}2(18-crown-6)], [Ca(dpp)2(thf)2] and [Ca(dpp)2(triglyme)].
abstract: Reactions of 2,2,6,6-tetramethyl-3,5-heptanedione (Htmhd), 1,1,1,5,5,5-hexafluoro-2,4-pentanedione (Hhfa) or 1,3-diphenyl-1,3-propanedione (Hdpp) with calcium methoxide in hexane or toluene afford the corresponding known oligomeric beta-diketonates: [Ca(3)(tmhd)(6)], [{Ca(hfa)(2)}(n)] and [{Ca(dpp)(2)}(n)]. The complexes react with tetrahydrofuran, 2,5,8,11-tetraoxadodecane (triglyme) or 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6) leading to the formation of the new mononuclear [Ca(dpp)(2)(thf)(2)], [Ca(dpp)(2)(triglyme)] and dinuclear [{Ca(dpp)(2)}(2)(18-crown-6)] and [{Ca(tmhd)(2)}(2)(18-crown-6)] adducts. The obtained complexes were characterized by elemental analyses, IR, (1)H and (13)C NMR spectroscopies; moreover, single crystal X-ray diffraction measurements were also carried out for: [{Ca(tmhd)(2)}(2)(18-crown-6)], [Ca(dpp)(2)(thf)(2)] and [Ca(dpp)(2)(triglyme)].
authors.affiliation: ICIS-CNR, Corso Stati Uniti 4, 35127-Padova, Italy. elhabra@icis.cnr.it
authors.forename: Naida
authors.initials: N
authors.lastname: El Habra
authors.forename: Franco
authors.initials: F
authors.lastname: Benetollo
authors.forename: Maurizio
authors.initials: M
authors.lastname: Casarin
authors.forename: Marco
authors.initials: M
authors.lastname: Bolzan
authors.forename: Andrea
authors.initials: A
authors.lastname: Sartori
authors.forename: Gilberto
authors.initials: G
authors.lastname: Rossetto