The synergistic effect of trivacant B-α-Ge W_(9)O_(34)fragments as structure-directing agents and inorganic B-O segments as intramolecular decoration afforded an unprecedented 28-Ni-added huge cluster K_(2)Na_(14)H_(...The synergistic effect of trivacant B-α-Ge W_(9)O_(34)fragments as structure-directing agents and inorganic B-O segments as intramolecular decoration afforded an unprecedented 28-Ni-added huge cluster K_(2)Na_(14)H_(10)[{Ni_(6)(OH)_(3)(H_(2)O)_(6)(Ge W_(9)O_(34))}{Ni_(8)-(μ_(6)-O)(OH)_(3)(H_(2)O)(BO(OH)_(2))(B_(2)O_(3)(OH)_(2))(Ge W_(9)O_(34))_(2)}]_(2)·46H_(2)O(1)under hydrothermal conditions.The polyoxoanion of 1contains two half-units,[{Ni_(6)(OH)_(3)(H_(2)O)_(6)(Ge W_(9)O_(34))}{Ni_(8)(μ_(6)-O)(OH)_(3)(H_(2)O)(BO(OH)_(2))(B_(2)O_(3)(OH)_(2))(Ge W_(9)O_(34))_(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 Ni_(6)(OH)_(3)(H_(2)O)_(6)(B-α-Ge W_(9)O_(34))({Ni_6Ge W_(9)})and a previously unobserved sandwiched Ni_(8)(μ_(6)-O)(OH)_(3)(H_(2)O)(BO(OH)_(2))(B_(2)O_(3)-(OH)_(2))(B-α-Ge W_(9)O_(34))_(2)({(Ni_(8)BB_(2))@(Ge W_(9))_(2)}),in which the{Ni_(8)BB_(2)}cluster contains a Lindqvist-type{Ni_(6)}core capped by two Ni O_(6)octahedra and further decorated by a BO(OH)_(2)({B})group and a binuclear B_(2)O_(3)(OH)_(2)({B_(2)})cluster.Furthermore,1 as a heterogeneous catalyst,has good catalytic activity for Knoevenagel condensation under mild reaction conditions.展开更多
基金supported by the National Natural Science Foundation of China(NSFC,21831001,21571016,91122028)the NSFC for Distinguished Young scholars(20725101)。
文摘The synergistic effect of trivacant B-α-Ge W_(9)O_(34)fragments as structure-directing agents and inorganic B-O segments as intramolecular decoration afforded an unprecedented 28-Ni-added huge cluster K_(2)Na_(14)H_(10)[{Ni_(6)(OH)_(3)(H_(2)O)_(6)(Ge W_(9)O_(34))}{Ni_(8)-(μ_(6)-O)(OH)_(3)(H_(2)O)(BO(OH)_(2))(B_(2)O_(3)(OH)_(2))(Ge W_(9)O_(34))_(2)}]_(2)·46H_(2)O(1)under hydrothermal conditions.The polyoxoanion of 1contains two half-units,[{Ni_(6)(OH)_(3)(H_(2)O)_(6)(Ge W_(9)O_(34))}{Ni_(8)(μ_(6)-O)(OH)_(3)(H_(2)O)(BO(OH)_(2))(B_(2)O_(3)(OH)_(2))(Ge W_(9)O_(34))_(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 Ni_(6)(OH)_(3)(H_(2)O)_(6)(B-α-Ge W_(9)O_(34))({Ni_6Ge W_(9)})and a previously unobserved sandwiched Ni_(8)(μ_(6)-O)(OH)_(3)(H_(2)O)(BO(OH)_(2))(B_(2)O_(3)-(OH)_(2))(B-α-Ge W_(9)O_(34))_(2)({(Ni_(8)BB_(2))@(Ge W_(9))_(2)}),in which the{Ni_(8)BB_(2)}cluster contains a Lindqvist-type{Ni_(6)}core capped by two Ni O_(6)octahedra and further decorated by a BO(OH)_(2)({B})group and a binuclear B_(2)O_(3)(OH)_(2)({B_(2)})cluster.Furthermore,1 as a heterogeneous catalyst,has good catalytic activity for Knoevenagel condensation under mild reaction conditions.
