ELECTROCHEMISTRY, SPECTROELECTROCHEMISTRY, AND PHOTOCHEMISTRY OF A SERIES OF NEW COVALENTLY LINKED TRIS(2,2'-BIPYRIDINE)RUTHENIUM(II) DIQUAT COMPLEXES
ELECTROCHEMISTRY, SPECTROELECTROCHEMISTRY, AND PHOTOCHEMISTRY OF A SERIES OF NEW COVALENTLY LINKED TRIS(2,2'-BIPYRIDINE)RUTHENIUM(II) DIQUAT COMPLEXES
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DOI：
10.1021/ja00302a009
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发表时间：
1985-01-01
影响因子：
15
通讯作者：
BLANEY, DD
中科院分区：
文献类型：
--
作者：
ELLIOTT, CM;FREITAG, RA;BLANEY, DD
结论先前在Li12A和Ca6A分子筛中观察到的次要组分Ag (C)在掺入Ag+之前通过与Mg2+离子交换而成为主要组分Ag (C)。在含Mg2+但仍富含钠的A型沸石中，升温超过100 K时Ag (C)衰变成Ag (A)。在完全钠交换的A沸石中，只看到Ag (A)。ESEM分析表明，Ag (C)与两个Ag- ow距离为0.26 nm的水分子相互作用，这两个水分子可能在笼中；与另外两个Ag- ow距离为0.29 nm的水分子相互作用，这两个水分子可能在/3笼中。我们认为，当沸石中含有足够数量的Na+离子时，Ag (C)位于A -和/3-笼之间的六环窗口上方的笼中S2*位置，并移动到六环窗口下方的/3-笼中S2*位置形成Ag (A)。这项研究得到了美国国家科学基金会和罗伯特·韦尔奇基金会的支持。我们感谢休斯顿大学能源实验室提供的设备支持，感谢Randy Wilkin先生在样品制备方面的帮助，感谢Sal contarini博士在热重测量方面的帮助。
Conclusions The minor species Ag (C) observed earlier in Li12A and Ca6A zeolites becomes a major Agspecies by ion exchange of A zeolite with Mg2+ prior to doping by Ag+. In A zeolites containing Mg2+ but still richer in sodium, Ag (C) decays to Ag (A) on warming above 100 K. In fully sodium-exchanged A zeolite only Ag (A) is seen. ESEM analysis indicatesthat Ag (C) interacts with two water molecules at an Ag-Ow distance of 0.26 nm, which are suggested to be in the-cage, and with two more water molecules at an Ag-Ow distance of 0.29 nm, which are suggested to be in the/3-cage. We suggest that Ag (C) is located at site S2* in the-cage just above the six-ring window between the a-and/3-cages and moves to S2'sites in the/3-cage below the six-ring window to form Ag (A) when the zeolite contains sufficient numbers of Na+ ions.Acknowledgment. This research was supported by the National Science Foundation and the Robert A. Welch Foundation. We thank the Energy Laboratory of the University of Houston for equipment support, Mr. Randy Wilkin for his help in sample preparations, and Dr. Sal Contarinifor the thermogravimetric measurements.