Pregled bibliografske jedinice broj: 711606
Pyridoxal hydrazonato molybdenum(VI) complexes : assembly, structure and epoxidation (pre)catalyst testing under solvent-free conditions
Pyridoxal hydrazonato molybdenum(VI) complexes : assembly, structure and epoxidation (pre)catalyst testing under solvent-free conditions // RSC Advances, 4 (2014), 73; 39000-39010 doi:10.1039/C4RA08179J (međunarodna recenzija, članak, znanstveni)
CROSBI ID: 711606 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Pyridoxal hydrazonato molybdenum(VI) complexes : assembly, structure and epoxidation (pre)catalyst testing under solvent-free conditions
Autori
Pisk, Jana ; Prugovečki, Biserka ; Matković-Čalogović, Dubravka ; Jednačak, Tomislav ; Novak, Predrag ; Agustin, Dominique ; Vrdoljak, Višnja
Izvornik
RSC Advances (2046-2069) 4
(2014), 73;
39000-39010
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
pyridoxal; polyoxomolybdate; Lindqvist anion; epoxidation; solvent-free;
(pyridoxal; polyoxomolybdate; Lindqvist anion; epoxidation; solvent-free)
Sažetak
Pyridoxal hydrazonato molybdenum(VI) complexes were prepared by the reaction of the corresponding hydrazone (H2L1 = pyridoxal isonicotinic acid hydrazone, H2L2 = pyridoxal benzhydrazone, H2L3 = pyridoxal 4-hydroxy benzhydrazone) and [MoO2(acac)2] under appropriate conditions. The complexes can be classified into three categories: mononuclear [MoO2(L1–3)(MeOH)], polynuclear [MoO2(L1–3)]n and hybrid organic–inorganic compounds with the Lindqvist polyoxomolybdate [MoO2(HL1–3)]2Mo6O19. A unique example of a cationic polymer assembly with Lindqvist anions is reported herein for the first time. The compounds were characterised by elemental, TG and DSC analyses and by spectroscopic (IR, UV-Vis, 1H, 13C NMR) techniques. The crystal and molecular structure of the pyridoxal benzhydrazone H2L2, three mononuclear complexes [MoO2(L1–3)(MeOH)], and the Lindqvist-containing compounds [MoO2(HL2)]2Mo6O19·2MeCN and (H4L1)Mo6O19 were determined by single crystal X-ray diffraction. All complexes were tested as (pre)catalysts for the epoxidation of cyclooctene under solvent-free conditions with the use of aqueous TBHP (TBHP = tert-butylhydroperoxyde) as an oxidant. Optimal results in terms of conversion, selectivity, TOF and TON were obtained at very low (pre)catalyst loadings (0.05% [Mo] vs. substrate). The influence of the Lindqvist anion on catalytic performance is discussed.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
POVEZANOST RADA
Projekti:
119-1191342-1082 - Novi kompleksni spojevi i materijali-kemijski i biološki katalizatori (Cindrić, Marina, MZOS ) ( CroRIS)
119-1191342-1083 - Interakcije i dizajn bioaktivnih molekula (Novak, Predrag, MZOS ) ( CroRIS)
119-1193079-1084 - Strukturno istraživanje bioloških makromolekula metodom rentgenske difrakcije (Matković-Čalogović, Dubravka, MZOS ) ( CroRIS)
Ustanove:
Prirodoslovno-matematički fakultet, Zagreb
Profili:
Višnja Vrdoljak
(autor)
Jana Pisk
(autor)
Dubravka Matković-Čalogović
(autor)
Tomislav Jednačak
(autor)
Biserka Prugovečki
(autor)
Predrag Novak
(autor)
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus