High-temperature, high-pressure hydrothermal synthesis, crystal structure and photoluminescent properties, of K₃[Gd_1−xTb_xGe₃O₈(OH)₂] (x = 0, 0.3, 0.1, 1)

Abstract

A family of new lanthanide germanates K3LnGe3O8(OH)2 have been synthesized by a high-temperature, high-pressure hydrothermal method and characterized by single-crystal X-ray diffraction.

A series of lanthanide germanate cluster organic frameworks

“…From the structural viewpoint, the second ligands in 1−5 only act as connectors between the bicapped sandwich-type {Ln 8 Ge 12 } cage and the supporting Ln 3+ cations, but can't connect neighboring SBUs. Thus, continued increasing the amount of the second ligand, 25 6 was obtained (Fig. 6a−e, S15 in ESI), as we expected, the second pza − ligand links adjacent {Dy 11 Ge 12 }-6 SBUs together.…”

“…S3m−o in ESI), which is different from that of capped Nd 3+ cations in the previously reported FJ-19 made by our group. 15 As to the supporting Nd 3+ cation (Nd9 3+ ), it displays the eight-coordinate bicapped trigonal prism geometry defined by three O COO atoms of E groups, 25 two N atoms and two O COO atoms of pza ligands and one terminal water molecule (Fig. S3p−r in ESI).…”

“…All chemicals were purchased commercially and used without further 25 purification. Powder X-ray diffraction (PXRD) data were collected on a Bruker D8 Advance diffractometer with Cu Kα radiation (λ = 1.5406 Å).…”

“…4 Among all these materials, germanates with open frameworks have attracted particular attention because of their unique structural architectures and interesting properties. 25 However the synthesis of open-framework germanates with low framework density remains a challenging research field. An alternative strategy of replacing the nodes of a simple underlying net with polyatomic structural building units (SBUs) has been brought up by Férey, O'Keeffe and Yaghi in the concept of scale chemistry.…”

Synthesis, crystal structure, and luminescence properties of a new europium silicate

“…9 Since then, Rocha et al have reported a series of lanthanide silicates AV-n (n = 9, 20, 23) 10 22 With continuous interest in the exploratory synthesis of lanthanide silicates under HT and HP conditions, our group has reported a number of microporous lanthanide silicates with special structures. 2,23,24,25 In this work, a new europium silicate, NaEuSi 3 O 7 (OH) 2 , has been prepared under HT and HP conditions, and its structure and luminescence properties have also been systematically investigated.…”