Abstract
This paper reports on chemical and spectral studies of the macrocyclic uranyl complexes dioxocyclopentakis(1-iminoisoindolinato)uranium(VI), SPcUO2, and dioxocyclopentakis(1-imino-5-methylisoindolinato)uranium(VI), Me5SPcUO2. These expanded, five-subunit analogues of phthalocyanines were synthesized in template reactions from uranyl salts and the corresponding phthalonitriles. The conditions for a high-yield synthesis are critical and include a polar solvent (e.g., dimethyl-formamide), high temperatures, and strict exclusion of water. Phthalocyanine, PcH2, is a side product of the reaction with the source of protons being the solvent. Attempts to displace the uranyl ion from SPcUO2 with acids or other metal ions (Mn+) invariably result in macrocycle contraction to produce PcH2 or PcMn-2 and phthalonitrile. 1H NMR studies reveal the five-subunit macrocycle to be stereochemically dynamic. The analysis of ring current induced 1H NMR shifts indicates considerably reduced π electron delocalization in SPcUO2 compared to PcM derivatives. The electronic spectrum of SPcUO2 exhibits strong absorption maxima at 4240 and 9140 Å. With the aid of Pariser-Parr-Pople SCFLCAOCl π electron molecular orbital calculations, the electronic structure of the macrocycle and the origin of the spectral transitions can be shown to be closely analogous to phthalocyanine systems. Many of the chemical and spectral properties of SPcUO2 and Me5SPcUO2 reflect the severe buckling and strain within the macrocyclic ligand.
| Original language | English |
|---|---|
| Pages (from-to) | 1695-1705 |
| Number of pages | 11 |
| Journal | Journal of the American Chemical Society |
| Volume | 100 |
| Issue number | 6 |
| Publication status | Published - 1978 |
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ASJC Scopus subject areas
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Large metal ion-centered template reactions. Chemical and spectral studies of the "superphthalocyanine" dioxocyclopentakis(1-iminoisoindolinato)uranium(VI) and its derivatives. / Marks, Tobin J; Stojakovic, Djordje R.
In: Journal of the American Chemical Society, Vol. 100, No. 6, 1978, p. 1695-1705.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Large metal ion-centered template reactions. Chemical and spectral studies of the "superphthalocyanine" dioxocyclopentakis(1-iminoisoindolinato)uranium(VI) and its derivatives
AU - Marks, Tobin J
AU - Stojakovic, Djordje R.
PY - 1978
Y1 - 1978
N2 - This paper reports on chemical and spectral studies of the macrocyclic uranyl complexes dioxocyclopentakis(1-iminoisoindolinato)uranium(VI), SPcUO2, and dioxocyclopentakis(1-imino-5-methylisoindolinato)uranium(VI), Me5SPcUO2. These expanded, five-subunit analogues of phthalocyanines were synthesized in template reactions from uranyl salts and the corresponding phthalonitriles. The conditions for a high-yield synthesis are critical and include a polar solvent (e.g., dimethyl-formamide), high temperatures, and strict exclusion of water. Phthalocyanine, PcH2, is a side product of the reaction with the source of protons being the solvent. Attempts to displace the uranyl ion from SPcUO2 with acids or other metal ions (Mn+) invariably result in macrocycle contraction to produce PcH2 or PcMn-2 and phthalonitrile. 1H NMR studies reveal the five-subunit macrocycle to be stereochemically dynamic. The analysis of ring current induced 1H NMR shifts indicates considerably reduced π electron delocalization in SPcUO2 compared to PcM derivatives. The electronic spectrum of SPcUO2 exhibits strong absorption maxima at 4240 and 9140 Å. With the aid of Pariser-Parr-Pople SCFLCAOCl π electron molecular orbital calculations, the electronic structure of the macrocycle and the origin of the spectral transitions can be shown to be closely analogous to phthalocyanine systems. Many of the chemical and spectral properties of SPcUO2 and Me5SPcUO2 reflect the severe buckling and strain within the macrocyclic ligand.
AB - This paper reports on chemical and spectral studies of the macrocyclic uranyl complexes dioxocyclopentakis(1-iminoisoindolinato)uranium(VI), SPcUO2, and dioxocyclopentakis(1-imino-5-methylisoindolinato)uranium(VI), Me5SPcUO2. These expanded, five-subunit analogues of phthalocyanines were synthesized in template reactions from uranyl salts and the corresponding phthalonitriles. The conditions for a high-yield synthesis are critical and include a polar solvent (e.g., dimethyl-formamide), high temperatures, and strict exclusion of water. Phthalocyanine, PcH2, is a side product of the reaction with the source of protons being the solvent. Attempts to displace the uranyl ion from SPcUO2 with acids or other metal ions (Mn+) invariably result in macrocycle contraction to produce PcH2 or PcMn-2 and phthalonitrile. 1H NMR studies reveal the five-subunit macrocycle to be stereochemically dynamic. The analysis of ring current induced 1H NMR shifts indicates considerably reduced π electron delocalization in SPcUO2 compared to PcM derivatives. The electronic spectrum of SPcUO2 exhibits strong absorption maxima at 4240 and 9140 Å. With the aid of Pariser-Parr-Pople SCFLCAOCl π electron molecular orbital calculations, the electronic structure of the macrocycle and the origin of the spectral transitions can be shown to be closely analogous to phthalocyanine systems. Many of the chemical and spectral properties of SPcUO2 and Me5SPcUO2 reflect the severe buckling and strain within the macrocyclic ligand.
UR - http://www.scopus.com/inward/record.url?scp=33947094864&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33947094864&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:33947094864
VL - 100
SP - 1695
EP - 1705
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 6
ER -