Yttrium β-diketonate complexes with triglyme: ionic and neutral isomers and outer-sphere co-ordination of triglyme †

Abstract

While monoglyme and diglyme reacted with [Y III (hfac) 3 ] to give eight-and nine-co-ordinate neutral complexes [Y(hfac) 3 (glyme)], 1 and 2 respectively, reactions with triglyme or tetraglyme resulted in disproportionation giving the ionic complexes [Y(hfac) 2 (glyme)] ϩ [Y(hfac) 4 ] Ϫ , 3a and 4 respectively; sublimation of 3a with adventitious water gave the outer-sphere glyme complex [Y(hfac) 3 (OH 2 ) 2 ]ؒMeO(CH 2 CH 2 O) 3 Me which has an infinite chain helical structure.

Yttrium β‐Diketonate Glyme MOCVD Precursors: Effects of the Polyether Length on Stabilities, Mass Transport Properties and Coordination Spheres

“…Ϫ , as previously proposed by Pollard et al [19] The 13 C NMR (CDCl 3 ) spectra can be assigned by comparison with the data of related lanthanum complexes. [1,3,4] Details of associated resonances are reported in Table 3.…”

“…The [Y(hfa) 3 ·diglyme] complex possesses an orthorhombic structure. It should be noted that the structure of [Y(hfa) 3 ·diglyme] has been previously published by Pollard et al, [19] but in a monoclinic habit. The average YϪO(hfa) distance, observed in the current, more symmetrical structure, is 2.361 Å , 0.015 Å longer than the bond lengths observed in the monoclinic derivative (2.346 Å ).…”

“…The present syntheses can be efficiently carried out in hexane with good yields thus avoiding the use of carcinogenic benzene or toluene, as in the alternative syntheses already reported. [19,20] The adducts synthesised are very soluble in common organic solvents such as ethanol, chloroform, acetone, pentane, and toluene, and slightly soluble in cyclohexane. Adducts 1؊3 have low melting points and evaporate quantitatively at low temperature under vacuum.…”

“…[19,20] However, there is no information on the thermal and masstransport properties of all these adducts.…”

Rational Design of Coordination Polymers with Flexible Oxyethylene Side Chains

“…The survey showed that most of the alkyl side chain fragments -O(CH 2 ) 9 CH 3 have fully extended structures, as shown in Figure 5(a). 17 However, Figure 5(b) shows that many oxyethylene -(OCH 2 CH 2 ) 3 CH 3 side chains exhibit non-stretched or balled-up conformations, [18][19][20] which are attributed to the higher flexibility of the oxyethylene unit.…”