Probing the molecular character of periodic mesoporous organosilicates via photoluminescence of Lewis acid-base adducts.
نویسندگان
چکیده
Photoluminescence decay was used as a structure-sensitive method to compare the distribution of emitting sites in periodic mesoporous organosilicates (PMOs) to their respective molecular analogs. The observed close similarity of PL decays confirms the molecular nature of PMOs and high homogeneity of emitting sites.
منابع مشابه
LEWIS-BASE ADDUCTS OF LEAD(II) COMPOUNDS VI.* SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF MONONUCLEAR (DIACETATO-0,O ')(1, 10-PHENANTHROLINE)
The synthesis and single-crystal X-ray structure determination of the title compound (phen)Pb(02CMe) is described. The complex crystallizes in the monoclinic space group P2 /c, a = 7.823(3), b = 12.421(4), c = 9.262(2) ?, ? = 79.92(3)", Z = 4, yielding R 0.048 for 3210 independent reflections. The coordination number around the lead atom is six. [Pb-N 2.54(2), 2.56(4)],[Pb-0, 2.19-2.22]
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The synthesis and single-crystal X-ray structure determination of the title compound (dinitrato) (1,4,8,11 -tetra-azaandecane) lead(II) is described. Crystals are monoclinic, P2 /ca= 10.271 (2)?,b= 13.524(4) ?,c= 11.298(6) ?,?=94.68(3),2=4,R,Rw, 0.036 and 0.041, respectively. The lead atom is eight-coordinate [Pb-N, 2.44 (2) - 2.55 (1)], [Pb-0,2.87 (1) - 3.06 (2)].
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Reactions of equemolar amounts of lead (II) nitrate and 2,2'- bipyridine o r l , 10- phenanthroline in aqueous methanolicsolution yield crystals of Pb (bipy)(H O)(NO ) (1) or Pb (phen) (H O) (NO ) (2) respectively. Their structures were determined by X-ray crystallography. The method and structure determination is described
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The reaction of PbCI, with 1,4,10,13-tetra-oxa-7, 16-diaza-cyclooctadecane (L= C H N O ) yielded colourless crystals of LPbCI . The complex crystallizes in monoclinic space group, C2/c, a = 7.90(2), b = 14.75(3) and C = 17.36(3) ?= ? 101.75(3)?, Z = 4 and R = 0.083 The coordination number around the lead atom is Eight . [Pb-N, 2.36(1), 2.70(4)], [Pb-0,2.41(3)-2.57(3)], [Pb-CI, 2.51(4), 2.5...
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The synthesis and single-crystal X-ray structure determination of the title compound [(bipy) , Pb(0 ,CMe) (O ClO )] (1) and [(bipy) Pb(ClO ) ] (2) is described. Compound (I) crystallizes in the triclinic space group P1(2), a= 7.384(2), b= 12.824(3), c= 10.622(6) A, ?= 73.41(2), ?= 80.98(2), ?= 73.68(2)', Z= 2, and R =0.033 for 3408 independent reflections .Compound (2) crystallizes in the ...
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ورودعنوان ژورنال:
- Physical chemistry chemical physics : PCCP
دوره 18 20 شماره
صفحات -
تاریخ انتشار 2016