SVIBOR - Papers quoted in CC - project code: 1-07-108
MINISTRY OF SCIENCE AND TECHNOLOGY
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Papers quoted in Current Contents on project 1-07-108
Quoted papers: 3
Other papers: 24
Total: 27
Title: Electronic Effects of Co-ordinated Methoxide on the Rates
of Entry of Imidazole Derivatives into
Dimethyl-3,7,12,17-tetramethyl-8,13-divinylphyrin-2,18-dipropanoato(2-)
-(methanol)methoxocobalt(III) in Methanol
- Authors:
- Ašperger, Smiljko (994)
- Vrban, G.
- Cetina-Čižmek, Biserka (121030)
- Orhanović, Mato
Journal: Journal of Chemical Society Dalton Transactions
Number: 7
ISSN: 0300-9246
Year: 1991
Pages: from 1847 to 1849
Number of references: 14
Language: engleski
Summary: The rates of replacenent of MeOH by imidazole derivatives
in
CoIIIL(MeO)(MeOH)(L=dimethyl-3,7,12,17-tetramethyl-8,13-divinilporphyrin-2,
18-dipropanoate) were measured. The most basicderivative enters most
slowly, as was previously observed forpyridine derivatives. The energies
and entropies of activation ofthe overall reactions with pyridine (py) and
imidazole (Him) areEa/kJ mol-1 = 40.0+/-3.1 (py) and 76.4+/-3.8 (Him),
anddeltaS+/JK-1 mol-1 = -105+/-10 (py), and -13.2+/-12.8 (Him). Itis
inferred that the transition state in the reaction with py isstabilised by
sigma and partial metal-to-ligand pi bonding, whilethat in the reaction
with imidazole involves sigma bonding only.
Keywords: kinetics, imidazole, cobalt-protoporphyrins
Title: High Secondary alfa-Deuterium Kinetic Isotope Effect in
the Acetolysis and Formolysis of Dideuterioferrocenylmethyl Benzoate
- Authors:
- Ašperger, Smiljko (994)
- Kukrić, Z.
- Saunders, W. H.
- Šutić, D.
Journal: Journal of Chemical Society Perkin Transactions 2
Number: 2
ISSN: 0300-9580
Year: 1992
Pages: from 275 to 279
Number of references: 16
Language: engleski
Summary: Acetolysis and formolysis of dideuterioferrocenylmethyl
benzoateexhibit large secondary alfa-deuterium kinetic isotope effectsand
an abnormal temperature dependence. In the presence of LiClO4(ca. 0.1 mol
dm-3) kH/kD at 25 oC amount to 1.53+/-0.02(acetolysis) and 1.48+/-0.03
(formolysis). In the presence ofLiClO4 the ratios of Arrhenius
pre-exponential factors, amount to0.49+/-0.01 (acetolysis) and 0.38+/-0.04
(formolysis). In theabsence of LiClO4 the AH/AD rations are about 0.02. We
sugestthat these surprisingly low values result from a change
inrate-determinig step over the temperature range, from formationof the
solvent-separated ion-pair at low temperatures to reactionof the
carbocation with solvent at the highest temperatures.
Keywords: kinetic isotope effects, secondary deuterium kinetic isotope effects, ferrocenylmethyl esters-solvolyse
Title: Refinement of parameters in differential scanning
calorimetric purity detrminations
- Authors:
- Bezjak, A.
- Grdinić, V.
- Cetina-Čižmek, Biserka (121030)
Journal: Acta Pharmaceutika
Number: 3
ISSN: 1330-0075
Volume: 42
Year: 1992
Pages: from 239 to 250
Number of references: 17
Language: engleski
Summary: A method has been developed for the refinement of
parameters inthe determination of purity of substances by lowering the
meltingpoint and by applying Van't Hoff's equation. The parameterscovered
by the refinement are: molar ratio of impurity (x2), areacorrection under
the melting curve (Ac) and the temperature ofmelting point of pure
substances (To). The refinement proceeds intwo steps: (i) the determination
of initial values by one of thepreviously developed procesures, and (ii)
the refinement ofinitial values by applying total differential of Van't
Hoff'sfunction with To, Ac and x2 as independent variables.
Keywords: refinement of parameters in DSC, DSC purity determination
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