Synthesis and crystal structure of the double barium–titanium isopropoxide [Ba₄Ti₄(µ₄-O)₄(µ₃-OR)₂(µ-OR)₈(OR)₆(ROH)₄][Ba₄Ti₄(µ4-O)₄(µ₃-OR)₂(µ-OR)₉(OR)₅(ROH)₃]

Abstract

An X-ray structural study of the crystals isolated from the solutions obtained by the reaction of Ba metal with Ti(OPri)4 in isopropyl alcohol has been carried out; the crystals of the compound, which is a precursor for the synthesis of BaTi03, contain molecules of two different kinds [Ba4Ti404(0R)16(ROH)4] and [Ba4Ti404(0R)16(ROH)3], where R = Pri.

Precursor and Solvent Effects in the Nonhydrolytic Synthesis of Complex Oxide Nanoparticles for Bioimaging Applications by the Ether Elimination (Bradley) Reaction

“…Keywords: bioimaging · crystal growth · nanoparticles · sol-gel processes · surface chemistry C 6 H 5 COCH 3 and protic allyl alcohol CH 2 CHCH 2 OH. [18] As the model system we chose barium titanate, BaTiO 3 -an oxide material with well-established alkoxide precursor chemistry, [19][20][21][22] and an interesting matrix for production of nanoparticles with attractive electric and optical characteristics through doping with rare earth cations. [15] As expected, solution thermolysis occurs directly on heating to reflux, without any special equipment required.…”

“…Parent alcohols (ethanol, n-propanol, and isopropanol) were purchased from Aldrich and purified by conventional techniques before use. The alkoxide precursors, ethoxide (an equimolar mixture of BaTi 2 A C H T U N G T R E N N U N G (OEt) 10 A C H T U N G T R E N N U N G (EtOH) 5 and Ba 4 Ti 2 OA C H T U N G T R E N N U N G (OEt) 14 A C H T U N G T R E N N U N G (EtOH) 2 [20] ), isopropoxide (Ba 4 Ti 4 O 4 A C H T U N G T R E N N U N G (OiPr) 16 A C H T U N G T R E N N U N G (iPrOH) 3.5 [19] ) and b-diketonato n-propoxide (Ba 2 Ti 2 A C H T U N G T R E N N U N G (thd) 4 A C H T U N G T R E N N U N G (OnPr) 8 A C H T U N G T R E N N U N G (nPrOH) 2 [15] ), were obtained by dissolution of Ba metal (for the Eu-doped samples together with Eu metal) in the parent alcohol under heating to reflux, addition of titanium alkoxide and if necessary an additional ligand (thd). The crystalline products were isolated and purified according to the earlier described techniques.…”

Photoluminescence investigations of Eu3+ doped BaTiO3 nanopowders fabricated using heterometallic tetranuclear alkoxide complexes

“…The further studies of the composition and structure of the applied sol-gel precursors revealed that solutions of homoleptic alkoxide complexes turned to contain precursors with compositions deviating from 1:1 (BaTi 4 (OR) 18 , Ba 2 Ti(OR) 8 (ROH) 4 , etc. [4]) or oxoalkoxide complexes demonstrating rather limited solution stability [5]. Strongly improved solution stability has been achieved by application of branched ␤-diketonate ligands such as 2,2,6,6-tetramethyl-heptanedionate (thd) together with alkoxide (ethoxide) ligands [6].…”

A self-assembled octanuclear complex bearing the uncommon close-packed {Fe4Mn4(μ4-O)4(μ-O)4} molecular core

“…The presence of such additional bridges is essential for the com- octanuclear compounds with this MST show the same geometrical configuration (b1) (Fig. 3) is observed only in three Ti 4 Ba 4 crystal structures [23][24][25] and it is the most complex one since it is formed using 16 bridging atoms. Obviously, the formation of complexes with the same MST but with a different geometrical configuration, at the least (b2), is also possible.…”