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P. Diversi G. Ingrosso A. Immirzi W. Porzio M. Zocchi 《Journal of organometallic chemistry》1977,125(2):253-271
Allene reacts with compounds of the type (β-diketonato)Ir(η-C8H14)2| (I) to give iridium(III) derivatives of formula (β-diketonato)IrC12H16 (II) in which an allene tetramer i.e. the 2,3,6,7-tetramethyleneoctane-1,8-diyl group, is bonded to the iridium atom by two η3-allylic groups. The molecular structures of these complexes were deduced by 1H NMR studies and by single-crystal X-ray analysis of (hfacac)IrC12H16 (IIb). The reactions of the complexes II with hydrogen and with CO are described.The reaction of (acac)Ir(η-C8H14)2 with allene, at -78°C, gives a thermally unstable compound of probable stoichiometry (acac)Ir(C3H4)4 (VI). Its low-temperature IR spectrum and its reaction with bromine indicate that VI contains two η2-bonded allene molecules and teh 3,4-dimethyleneiridocyclopentane moiety. VI reacts with pyridine with loss of an allene molecule to give an iridium(III) derivative of formula (acac)Ir(C6H8)(C3H4)py (IX). Complex IX was shown by single-crystal X-ray analysis to contain the 3,4-dimethyleneiridocyclopentane moiety and one η2-bonded allene molecule.The role of irido cycles as precursors of the bis(allylic) complexes II is discussed. 相似文献
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P. Diversi G. Ingrosso A. Immirzi M. Zocchi 《Journal of organometallic chemistry》1975,102(4):C49-C51
The reaction of allene with (Hfacac)Ir(η-C8H14)2 to give a new bis-η-allylic complex of iridium(III) containing an allene tetramer is described; the X-ray structure of this compound is reported. 相似文献
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Giovanni Maglio Anna Migliozzi Rosario Palumbo Barbara Immirzi Maria Grazia Volpe 《Macromolecular rapid communications》1999,20(4):236-238
A binary poly(L ‐lactide)/poly(ε‐caprolactone) (PLLA/PCL) (70/30 w/w) blend and a ternary PLLA/PCL/PLLA‐PCL‐PLLA blend of the same composition which contains 4 wt.‐% of a triblock PLLA‐PCL‐PLLA copolyester as compatibilizing agent were prepared by melt mixing at 200°C. Investigation of the thermal and mechanical properties of the blends and scanning electron microscopy of their fracture surfaces showed in the case of the ternary blend a better state of dispersion of PCL in the PLLA matrix and an improved toughness. 相似文献
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P. Locatelli A. Immirzi A. Zambelli R. Palumbo G. Maglio 《Colloid and polymer science》1977,255(7):722-722
Ohne Zusammenfassung 相似文献
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