Platinum(II) and Palladium(II) Complexes of Bis(diphenylphosphino)calix[4]arene Tetrabenzyl Ether: Fluxional Behavior Caused by Two Motions
作者： Kazuhiro Takenaka , Yasushi Obora , Li Hong Jiang , Yasushi Tsuji
DOI: 10.1021/OM010882Q
关键词:
摘要: The synthesis and complexation behavior of a novel bis-phosphine ligand based on calix[4]arene scaffold, 5,17-bis(diphenylphosphino)-25,26,27,28-tetrabenzyloxycalix[4]arene (3), are reported. Reaction 3 with PdCl2(cod) under dilute conditions results in formation the trans-coordinated dinuclear complex [PdCl2·3]2 (4). X-ray structure 4 reveals that two phosphinocalix[4]arene molecules linked by PdCl2 fragments. On other hand, reaction PtCl2(cod) affords cis-chelating mononuclear PtCl2·3 (5). structure, low-temperature NMR measurements, geometry optimization 5 reveal solution at −80 °C solid-state has C1 symmetry where P−Pt−P plane is inclined moiety twisted. It was also found reacts [Pd(η3-C3H5)(cod)]BF4 to yield corresponding cationic [Pd(η3-C3H5)·3]BF4 (6) quantitatively. Low-temperature measurements suggest 6 exists as mixture st...
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