1998
DOI: 10.1039/a803034k
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Dinuclear molybdenum and gadolinium complexes of new ‘back-to-back’ B–B linked bis[tris(pyrazolyl)borate] ligands

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Cited by 30 publications
(15 citation statements)
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“…Syntheses. The ligands [L 1 ] - , [L 2 ] - , [L 3 ] - , and [L 4 ] 2- were prepared (as their potassium salts) according to the previously published methods. ,,, Their lanthanide complexes have the composition [Ln(L 1 ) 2 (NO 3 )], [Ln(L 2 ) 2 (NO 3 )], [Ln(L 3 )(NO 3 ) 2 ], and [{Ln(NO 3 ) 2 } 2 (L 4 )] and were all prepared simply by reaction of the ligand with 0.5 equiv (for [L 1 ] - and [L 2 ] - ), 1 equiv (for [L 3 ] - ), or 2 equiv (for [L 4 ] 2- ) of the appropriate lanthanide(III) nitrate hydrate in methanol. Typically, separate solutions of the ligand and the lanthanide nitrate in the minimum amount of MeOH were prepared and then mixed together with stirring; a white precipitate formed quickly.…”
Section: Methodsmentioning
confidence: 99%
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“…Syntheses. The ligands [L 1 ] - , [L 2 ] - , [L 3 ] - , and [L 4 ] 2- were prepared (as their potassium salts) according to the previously published methods. ,,, Their lanthanide complexes have the composition [Ln(L 1 ) 2 (NO 3 )], [Ln(L 2 ) 2 (NO 3 )], [Ln(L 3 )(NO 3 ) 2 ], and [{Ln(NO 3 ) 2 } 2 (L 4 )] and were all prepared simply by reaction of the ligand with 0.5 equiv (for [L 1 ] - and [L 2 ] - ), 1 equiv (for [L 3 ] - ), or 2 equiv (for [L 4 ] 2- ) of the appropriate lanthanide(III) nitrate hydrate in methanol. Typically, separate solutions of the ligand and the lanthanide nitrate in the minimum amount of MeOH were prepared and then mixed together with stirring; a white precipitate formed quickly.…”
Section: Methodsmentioning
confidence: 99%
“…The ligands [L 1 ] -, [L 2 ] -, [L 3 ] -, and [L 4 ] 2were prepared (as their potassium salts) according to the previously published methods. 8,9,11,12 Their lanthanide complexes have the composition [Ln-…”
Section: Methodsmentioning
confidence: 99%
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“…129 Rigid back-to-back connection of podand units in [L21] 2-also ensures the formation of strict dimetallic complexes [{Gd(NO 3 ) 2 }L21] in which two bidentate nitrate anions per Gd(III) complete the coordination spheres. 130 Besides these and related special cases, a large amount of polymetallic f-f 15,18,24,131 and d-f 12,15,20 complexes have been isolated in the solid state in which more or less flexible podand-type ligands bridge two or more metal ions leading to aesthetically appealing solid-state lanthanide-containing clusters whose existence and speciation in solution are largely unexplored (Figure 15). Since crystallization processes select the less soluble candidate of a complete 'dynamic combinatorial library' occurring in solution under a precise set of external conditions, 132 correlations between isolated solid-state structures and thermodynamic parameters responsible for equilibria occurring in solution are often limited and sometimes inadequate.…”
Section: Planning Discrete Lanthanide-containing Polymetallic Assementioning
confidence: 99%
“…With high boiling substituted pyrazoles, it can be driven one step further to obtain the [RB(pz x ) 3 ]species. The two ligating sites have been linked together by a direct B B bond [120][121][122], the 1,1 -ferrocenylene moiety [97], and the m-or p-phenylene ring [115]. It is necessary the presence of sufficient pyrazolate ion, (pz) -, to convert quickly [R 3 B(pz x )]to [R 2 B(pz x ) 2 ]species, otherwise the [R 2 B(pz x )]species will dimerize to the stable pyrazabole R 2 B(μpz x ) 2 BR 2 (Fig.…”
Section: Synthesis Of Poly(pyrazolyl)boratesmentioning
confidence: 99%