Synthesis of Two New Ni₁₂‐Cluster Substituted Sandwiched Phosphotungstates Organic‐Cluster and their Magnetic Property

Abstract

Two new Ni12‐substituted sandwiched phosphotungstates organic‐cluster, H2[Ni6(OH)3(H2O)9(PW9O34)(1,4‐NDC)1/2(H2O)1/2]2 ⋅ 14 H2O (1), Ni(H2O)2(en)2[Ni6(OH)3(H2O)6(en)2(PW9O34)(2,6‐NDC)1/2]2 ⋅ 11H2O (2) (en=1,2‐ethylenediamine; 1,4‐NDC=Naphthalene‐1,4‐dicarboxylic acid; 2,6‐NDC=Naphthalene‐2,6‐dicarboxylic acid) which are composed of {Ni6PW9} as second building units (SBU) and organic molecular as the bridging molecule have been synthesized by a hydrothermal method under mild condition. From single‐crystal X‐ray crystallography, we could observe two different configurations between 1 and 2. Two {Ni6PW9} SBUs were connected through 1,4‐H2NDC molecular and 2,6‐H2NDC molecular, respectively. Thought the connection of organic molecular, we successfully increase the nuclear number of transition‐metal‐substituted polyoxometalates. Meanwhile, both of two compounds have ferromagnetic interactions, which guides us to synthesize novel phosphotungstates with ferromagnetic property.

40Ni-Added Poly(polyoxometalate) Assembled by {Ni6GeW9} and {Ni8(GeW9)2} Units: Structure, Magnetic, and Heterogeneous Catalysis Properties

“…The results confirm the overall ferromagnetic coupling among the Ni 2+ ions. However, the magnetic susceptibility data do not follow the Curie–Weiss law in 2–45 K, which may be affected by the ZFS effect …”

“…Previous studies have shown that there is a certain correlation between magnetic coupling and the However, the magnetic susceptibility data do not follow the Curie−Weiss law in 2−45 K, which may be affected by the ZFS effect. 37 Visible Light-Driven H 2 Evolution Study. The synergistic effect of POM and transition metals can provide potential opportunity for photocatalysis.…”