Construction of two novel borotungstates modified by different ligands connected with single/double bridges

Abstract

Two novel organic-inorganic hybrid borotungstates are decorated by two disparate ligands: (H 2 bibp) 2 [bibp{Cu(bipy)(bibp)} 2 {Cu(bipy)Cl} 2 {BW 12 O 40 } 2 ]Á3H 2 O (1) and [{Cu(bipy) 2 }{Cu(bipy)(Hbtb)}{BW 12 O 40 }](2) (bipy = 2,2 0 -bipyridine, bibp = 4,4 0 -bis(imidazolyl)biphenyl, btb = 1,4-bis(1H-1,2,4-triazol-1-yl)benzene) have been hydrothermally synthesized and structurally characterized by elemental analysis, IR, TG, UV-Vis, XRD and single-crystal X-ray diffraction. Compound 1 exhibits an interesting network consisting of two [BW 12 O 40 ] 5À ({BW 12 }) polyoxoanion units linked by two kinds of copper ions to shape a hole structure. Each unit is linked through [bibp{Cu(bipy)(bibp)} 2 {Cu(bipy)Cl} 2 ] 6+ to form a Z-type one-dimensional (1-D) chain by alternating the single/double-bridge connection. Compound 2 is composed of {BW 12 } polyoxoanions and the [{Cu(bipy) 2 }{Cu(bipy)(Hbtb)}] 5+ coordination cation, connected by a {Cu-btb-Cu} single-bridge to generate a novel 1-D network. There are p-p stacking interactions or supramolecular interactions all throughout to construct two-dimensional (2-D) and three-dimensional (3-D) architectures. The photocatalytic properties, electrochemical properties and electrocatalytic activities of these two compounds have been investigated in detail.

Lanthanide-Incorporated Borotungstates Including Keggin-type [BW11O39]9– Fragments and Their Luminescence Properties

“…Polyoxometalates (POMs) have intensively appealed to increasing research enthusiasm in recent years, not only owing to their unrivalled structural diversities and charming topological aesthetics but also because of their immense applications in catalysis, medicine, electronics, magnetism, optics, and so forth. − It is noteworthy that POMs can function as multidentate ligands to incorporate diverse transition-metal (TM) or lanthanide (Ln) cations into multifarious POM building units, stimulated by their intrinsic properties of high negative charge density and O-enriched surfaces . In this regard, lacunary POMs have attracted high interest in the field of synthesis, which are more prone to coalesce with oxophilic metal cations than plenary POMs due to the chelating coordination of terminal oxygen atoms from the defect sites of POMs, and then those captured metal cations can act as additional extension points to fuse other segments together generating ingenious TM-incorporated POMs (TMSPs) or Ln-incorporated POMs (LnSPs). − …”

Two New Preyssler‐Type Polyoxometalate‐Based Coordination Polymers and Their Application in Horseradish Peroxidase Immobilization

“…The emission band at λ =345 nm of H 2 biim could be assigned to the π*→π transition. The emission bands at λ =400 and 415 nm of compounds 1 and 2 may be caused by the coordination of Cu 2+ and H 2 biim, leading to LMCT (N→Cu) . This indicates that the {ZP 5 W 30 } unit and Cu‐H 2 biim complex were successfully introduced into the two compounds.…”

Nanocomposites Containing Keggin Anions Anchored on Pyrazine-Based Frameworks for Use as Supercapacitors and Photocatalysts

“…On the surface of the POM, some effective reactions occurred, resulting in photocatalytic activity. Exciting POM with light energy to obtain catalytic activity forms the excited-state species (POMs) and brings about an intermolecular O–M charge transfer. , Shining an ultraviolet light on compounds 1 – 3 generates motivated state Keggin-based species and O–W/O–Mo charge transfer and then produces considerable electrons and holes to oxidize the RhB and MB dye. Besides, MOFs, possessing highly porous architecture in numerous varieties, consisted of inorganic units and organic ligands, with high surface area and hollows that are sufficient for diffusing molecules, even though the POMs clusters are encircled.…”