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  3. Chemistry; Chem Sci/Eng

bulky oleate ligands

Russian translation: объемный олеатный лиганд

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:bulky oleate ligands
Russian translation:объемный олеатный лиганд

13:51 Jul 12, 2013
    The asker opted for community grading. The question was closed on 2013-07-16 07:54:12 based on peer agreement (or, if there were too few peer comments, asker preference.)


English to Russian translations [PRO]
Tech/Engineering - Chemistry; Chem Sci/Eng
English term or phrase: bulky oleate ligands
Subsequently, a ligand exchange reaction was carried out where the bulky oleate ligands were exchanged with shorter-chain octylamine or ethanethiol ligands in a nitrogen glove box over a period of 48 hours, where: after precipitating the nanocrystals in acetone, the nanocrystals were redispersed in 10 ml of octylamine; or, after redispersing the nanocrystals in toluene, an equal volume of ethanethiol was added to the suspension. Subsequently, the ligand exchanged particles were precipitated with acetone and finally redispersed in chloroform at a concentration of about 60 mg/ml. The exchange of oleate passivating groups with octylamine resulted in a clear dispersion with no agglomeration of particles.
BelialDE
Ukraine
Local time: 01:49
объемный олеатный лиганд
Explanation:
A bulkier ligand (with large cone-angle) tends to have a higher dissociation rate than smaller ligands and electron-rich metal-centers tend to accelerate the “oxidative addition”, a key-step in the catalytic cycle.


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Note added at 1 час (2013-07-12 15:03:44 GMT)
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Bulky ligands[edit]

Bulky ligands are used to control the steric properties of a metal center. They are used for many reasons, both practical and academic. On the practical side, they influence the selectivity of metal catalysts, e.g., in hydroformylation. Of academic interest, bulky ligands stabilize unusual coordination sites, e.g., reactive coligands or low coordination numbers. Often bulky ligands are employed to simulate the steric protection afforded by proteins to metal-containing active sites. Of course excessive steric bulk can prevent the coordination of certain ligands.
Selected response from:

Arkadii Marchenko
Ukraine
Local time: 01:49
Grading comment
Selected automatically based on peer agreement.
4 KudoZ points were awarded for this answer



Summary of answers provided
4громоздкие/тяжелые олеатные лиганды
Anton Konashenok
2 +2объемный олеатный лиганд
Arkadii Marchenko


  

Answers


1 hr   confidence: Answerer confidence 4/5Answerer confidence 4/5
громоздкие/тяжелые олеатные лиганды


Explanation:
речь действительно идет о больших геометрических размерах лиганда (у олеата действительно длинная углеродная цепочка)

учитывая дальнейший текст, можно написать и "длинноцепочечные олеатные лиганды":

...при которой длинноцепочечные олеатные лиганды заменялись на короткоцепочечные октиламиновые или этантиольные...

Anton Konashenok
Czech Republic
Local time: 00:49
Works in field
Native speaker of: Native in RussianRussian, Native in EnglishEnglish
PRO pts in category: 141

Peer comments on this answer (and responses from the answerer)
neutral  Arkadii Marchenko: он не только большой, но и при этом занимает большое пространство, поэтому их используют для стабилизации координационных центров
2 mins
  -> Да, конечно.
Login to enter a peer comment (or grade)

1 hr   confidence: Answerer confidence 2/5Answerer confidence 2/5 peer agreement (net): +2
объемный олеатный лиганд


Explanation:
A bulkier ligand (with large cone-angle) tends to have a higher dissociation rate than smaller ligands and electron-rich metal-centers tend to accelerate the “oxidative addition”, a key-step in the catalytic cycle.


--------------------------------------------------
Note added at 1 час (2013-07-12 15:03:44 GMT)
--------------------------------------------------

Bulky ligands[edit]

Bulky ligands are used to control the steric properties of a metal center. They are used for many reasons, both practical and academic. On the practical side, they influence the selectivity of metal catalysts, e.g., in hydroformylation. Of academic interest, bulky ligands stabilize unusual coordination sites, e.g., reactive coligands or low coordination numbers. Often bulky ligands are employed to simulate the steric protection afforded by proteins to metal-containing active sites. Of course excessive steric bulk can prevent the coordination of certain ligands.


    Reference: http://www.acros.be/_rainbow/pdf/ao-phosphine-ligands.pdf
Arkadii Marchenko
Ukraine
Local time: 01:49
Specializes in field
Native speaker of: Native in RussianRussian, Native in UkrainianUkrainian
PRO pts in category: 8
Grading comment
Selected automatically based on peer agreement.

Peer comments on this answer (and responses from the answerer)
agree  Olga Avdeeva: я бы тоже так сказала
19 hrs
  -> спасибо!
agree  Alexander Detistov: bulky ligands - объёмные лиганды
2 days 23 hrs
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