Spectroscopy and structure of [LnL₃bipy] and [LnL₃phen] complexes with CAPh type ligand dimethylbenzoylamidophosphate

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• 作者：N.S. Kariaka^a ; ^{natalia_kariaka@i.ua" class="auth_mail" title="E-mail the corresponding author} ; V.A. Trush^a ; P. Gawryszewska^b ; V.V. Dyakonenko^c ; S.V. Shishkina^c ; ^d ; T.Yu. Sliva^a ; V.M. Amirkhanov^a
• 关键词：Lanthanides ; Carbacylamidophosphates ; Coordination compounds ; Luminescence ; Absorption spectroscopy
• 刊名：Journal of Luminescence
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：178
• 期：Complete
• 页码：392-399
• 全文大小：2219 K

文摘

Coordination compounds with general formulas [LnL₃bipy] (trong class="boldFont">Ln1trong>) and [LnL₃phen] (trong class="boldFont">Ln2trong>), where Ln=La–Nd, Sm–Yb, L⁻–phosphoro-azo β-diketone analog anion: [C₆H₅CONPO(OCH₃)₂]⁻, phen=1,10-phenanthroline, bipy=2,2′-bipyridine, were synthesized and characterized by means of IR, ¹H NMR and high resolution UV–vis absorption and luminescence spectroscopy (emission, excitation spectra and emission decay times) at 300, 77 and 4.2 K. The thermal behavior and stability of Eu^III and Tb^III complexes were studied by thermogravimetric and differential thermal analyses. Single-crystal X-ray diffraction data showed that trong class="boldFont">Pr1trong>, trong class="boldFont">Yb1trong> and trong class="boldFont">La2trong>, trong class="boldFont">Eu2trong>, trong class="boldFont">Gd2trong>, trong class="boldFont">Yb2trong> crystalize in the monoclinic and triclinic systems, respectively with eight-coordinated lanthanide ions. The relation between the crystal structure and spectroscopic properties of the complexes are discussed. The Eu^III and Tb^III complexes exhibited a strong metal-centered emission with decay time 1.5–1.8 ms. Intrinsic quantum yields (thmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022231316302393&_mathId=si0002.gif&_user=111111111&_pii=S0022231316302393&_rdoc=1&_issn=00222313&md5=10f9b7138d9dfd5d10504792833d7cec">t="17" width="23" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0022231316302393-si0002.gif">t>t="17" border="0" style="vertical-align:bottom" width="23" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0022231316302393-si0002.gif">t>thContainer hidden">thCode">th altimg="si0002.gif" overflow="scroll">thvariant="italic">Qthvariant="normal">Lthvariant="normal">nthvariant="normal">Lthvariant="normal">nth>) equal 57 (trong class="boldFont">Eu1trong>) and 55% (trong class="boldFont">Eu2trong>). The Tb^III complexes revealed a very efficient ligand-to-metal energy transfer at room and low temperatures.