TY - JOUR
T1 - A new 28-Ni-added poly(polyoxometalate) with B atoms
T2 - synthesis, structure and catalysis for Knoevenagel condensation
AU - Lian, Chen
AU - Li, Hai Lou
AU - Yang, Guo Yu
N1 - Publisher Copyright:
© 2023, Science China Press.
PY - 2023/5
Y1 - 2023/5
N2 - The synergistic effect of trivacant B-α-GeW9O34 fragments as structure-directing agents and inorganic B-O segments as intramolecular decoration afforded an unprecedented 28-Ni-added huge cluster K2Na14H10[{Ni6(OH)3(H2O)6(GeW9O34)}{Ni8-(μ 6-O)(OH)3(H2O)(BO(OH)2)(B2O3(OH)2)(GeW9O34)2}]2·46H2O (1) under hydrothermal conditions. The polyoxoanion of 1 contains two half-units, [{Ni6(OH)3(H2O)6(GeW9O34)}{Ni8(μ 6-O)(OH)3(H2O)(BO(OH)2)(B2O3(OH)2)(GeW9O34)2}]13−, which joined together via Ni−O=W linkages. The most fascinating feature is that each half-unit can be regarded as the fusion of an Ni6(OH)3(H2O)6(B-α-GeW9O34) ({Ni6 GeW9}) and a previously unobserved sandwiched Ni8(μ 6-O)(OH)3(H2O)(BO(OH)2)(B2O3−(OH)2)(B-α-GeW9O34)2 ({(Ni8 BB2 )@(GeW9 )2 }), in which the {Ni8 BB2 } cluster contains a Lindqvist-type {Ni6 } core capped by two NiO6 octahedra and further decorated by a BO(OH)2 ({B}) group and a binuclear B2O3(OH)2 ({B2 }) cluster. Furthermore, 1 as a heterogeneous catalyst, has good catalytic activity for Knoevenagel condensation under mild reaction conditions. [Figure not available: see fulltext.]
AB - The synergistic effect of trivacant B-α-GeW9O34 fragments as structure-directing agents and inorganic B-O segments as intramolecular decoration afforded an unprecedented 28-Ni-added huge cluster K2Na14H10[{Ni6(OH)3(H2O)6(GeW9O34)}{Ni8-(μ 6-O)(OH)3(H2O)(BO(OH)2)(B2O3(OH)2)(GeW9O34)2}]2·46H2O (1) under hydrothermal conditions. The polyoxoanion of 1 contains two half-units, [{Ni6(OH)3(H2O)6(GeW9O34)}{Ni8(μ 6-O)(OH)3(H2O)(BO(OH)2)(B2O3(OH)2)(GeW9O34)2}]13−, which joined together via Ni−O=W linkages. The most fascinating feature is that each half-unit can be regarded as the fusion of an Ni6(OH)3(H2O)6(B-α-GeW9O34) ({Ni6 GeW9}) and a previously unobserved sandwiched Ni8(μ 6-O)(OH)3(H2O)(BO(OH)2)(B2O3−(OH)2)(B-α-GeW9O34)2 ({(Ni8 BB2 )@(GeW9 )2 }), in which the {Ni8 BB2 } cluster contains a Lindqvist-type {Ni6 } core capped by two NiO6 octahedra and further decorated by a BO(OH)2 ({B}) group and a binuclear B2O3(OH)2 ({B2 }) cluster. Furthermore, 1 as a heterogeneous catalyst, has good catalytic activity for Knoevenagel condensation under mild reaction conditions. [Figure not available: see fulltext.]
KW - high-nuclearity TMAPs
KW - hydrothermal synthesis
KW - knoevenagel condensation
KW - polyoxometalate
UR - http://www.scopus.com/inward/record.url?scp=85153075500&partnerID=8YFLogxK
U2 - 10.1007/s11426-022-1516-1
DO - 10.1007/s11426-022-1516-1
M3 - Article
AN - SCOPUS:85153075500
SN - 1674-7291
VL - 66
SP - 1394
EP - 1399
JO - Science China Chemistry
JF - Science China Chemistry
IS - 5
ER -