Novel dense organic–lanthanide hybrid architectures: syntheses, structures and magnetic properties
作者:Zheng-Shuai Bai、Jing Xu、Taka-aki Okamura、Man-Sheng Chen、Wei-Yin Sun、Norikazu Ueyama
DOI:10.1039/b816205k
日期:——
Six novel three-dimensional (3D) dense organicâlanthanide(III) frameworks with formula [Ln(HBPTCA)(H2O)]·3H2O}n [Ln = La (1), Ce (2), Sm (3)] and [Ln4(BPTCA)3(H2O)4]n [Ln = Tb (4), Dy (5), Ho (6)] were obtained by reactions of the corresponding lanthanide nitrate salt with 4,4â²-bipyridine-2,2â²,6,6â²-tetracarboxylic acid (H4BPTCA) under different conditions. Complexes 1â3 have the same structure with (4, 62)2(42, 610, 83) topology, which is rare binodal (3, 6)-connecting rutile structure, while the complexes 4â6 also with the same structure have different topology of (42, 6)4(6, 82)4(43, 63)4(42, 64)6(44, 65, 85, 10). The results indicate that the reaction conditions have great influence on the structure of the resulted complexes in this system. In addition, the H4BPTCA was found to be an effective bridging ligand for construction of novel lanthanide-based dense hybrids, and two new coordination modes of the BPTCA4â were found in the complexes. The photoluminescent property of 4 and magnetic properties of 2, 5 and 6 were also investigated.
通过相应的硝酸镧盐与 4,4â²-联吡啶-2,2â²,6,6â²-四羧酸反应,获得了六种新型三维(3D)致密有机镧系元素(III)框架,其式为[Ln(HBPTCA)(H2O)]Â-3H2O}n [Ln = La (1),Ce (2),Sm (3)]和 [Ln4(BPTCA)3(H2O)4]n [Ln = Tb (4)、Dy (5),Ho (6)]是由相应的硝酸镧盐与 4,4â²-联吡啶-2,2â²,6,6â²-四羧酸(H4BPTCA)在不同条件下反应得到的。络合物 1â3 具有相同的结构,拓扑结构为(4, 62)2(42, 610, 83),属于罕见的二重(3, 6)连接金红石结构;而同样具有相同结构的络合物 4â6 则具有不同的拓扑结构,拓扑结构为(42, 6)4(6, 82)4(43, 63)4(42, 64)6(44, 65, 85, 10)。结果表明,反应条件对该体系中生成的配合物的结构有很大影响。此外,研究还发现 H4BPTCA 是构建新型镧系致密杂化物的有效桥接配体,并在配合物中发现了 BPTCA4â 的两种新配位模式。此外,还研究了 4 的光致发光性能以及 2、5 和 6 的磁性能。