The reactions of cobalt(II) perchlorate with a diazine tetratopic helicand, H₄L, in the presence of sodium carbonate afford two coordination polymers constructed from tetranuclear anionic helicates as building blocks: _∞³[Co₄L₃Na₄(H₂O)₄]·4H₂O (1) and _∞²[Co₅L₃Na₂(H₂O)₉]·2.7H₂O·DMF (2). The tetranuclear triple-stranded helicates, {Co^II₄L₃}^4–, are connected in 1 by sodium(I) ions and in 2 by sodium(I) and cobalt(II) ions (H₄L results from the condensation reaction between 3-formylsalicylic acid and hydrazine). The crystal structures of the two compounds have been solved. In both compounds the anionic helicates interact with the assembling cations through the carboxylato oxygen atoms. Compound 2 features chains resulting from connecting the tetranuclear helicates through cobalt(II) ions. The analysis of the magnetic properties of compounds 1 and 2 evidenced a dominant antiferromagnetic coupling for 1, resulting in a diamagnetic ground state. In contrast, the magnetic behavior of 2 is dominated at low temperature by the Co^II ion which connects the antiferromagnetically coupled {Co^II₄} helical moieties. The ac magnetic measurements for 2 reveal the occurrence of slow relaxation of the magnetization that is due to the single, uncorrelated cobalt(II) ions, which are diluted in an essentially diamagnetic matrix of {Co^II₄} moieties (ΔE_eff = 26.7 ± 0.3 cm^–1 with τ₀ = (2.3 ± 0.2) × 10^–6 s).

中文翻译：

---

连接[Co ^II ₄ ]的钴（II）离子跃迁成2-D配位聚合物，显示出磁化作用的缓慢弛豫

钴的反应（II）高氯酸盐与二嗪tetratopic helicand，H ₄ L，在钠的存在下碳酸提供由四核阴离子helicates构造为积木2种的配位聚合物：_∞ ³ [CO ₄大号₃的Na ₄（H ₂ ö ）₄ ]·4H ₂ O（1）和_∞ ² [CO ₅大号₃的Na ₂（H ₂ O）₉ ]·2.7H ₂ O·DMF（2）。四核三链螺旋，{Co ^II ₄ L₃ } ^4–分别以1个钠离子（I）和2个钠离子（I）和钴（II）离子连接（H ₄ L由3-甲酰基水杨酸和肼之间的缩合反应产生）。两种化合物的晶体结构已经解析。在这两种化合物中，阴离子螺旋都通过羧基氧原子与组装的阳离子相互作用。化合物2具有通过钴（II）离子连接四核螺旋体而形成的链。化合物的磁特性的分析1和2所证明的主导的反铁磁耦合为1，导致抗磁性基态。相反，在低温下，2的磁行为由连接反铁磁耦合的{Co ^II ₄ }螺旋结构部分的Co ^II离子支配。用于AC磁场测量2揭示的磁化的慢松弛的发生是由于单一的，不相关的钴（II）离子，这是在{钴的基本上反磁性基质稀释^II ₄ }部分（Δ Ë _EFF = 26.7 ±0.3厘米^-1与τ ₀ =（2.3±0.2）×10 ^-6 S）。