The reactions of (E)-quinoline-2-carbaldehyde oxime (Hqcah) with Ni(ClO₄)₂·6H₂O and NH₄SCN and with Ni(CF₃SO₃)₂ and NaN₃ led to two solitary metallacrowns (MCs) ([Ni₅(qcah)₇(Hqcah)(CH₃OH)(SCN)(OH)]·ClO₄ (1) and [Ni₄(qcah)₄(N₃)₄(Py)₄] (2), respectively. Complex 1 is a pentanuclear nickel cluster that exhibits two "fused" 9-MC-3 structural units with both rings possessing Ni2–N–O–Ni1–N–O–Ni5–O–N and Ni3–N–O–Ni4–O–Ni5–O–N connectivities. Complex 2 consists of four [Ni(qcah)(N₃)(Py)] units with adjacent nickel atoms linked together through N–O groups to construct a tetranuclear 12-MC-4 metallacrown. The ligands exhibit μ₃:η²:η¹:η¹, μ₂:η²:η¹ and μ₁:η² coordination modes in 1 and μ₂:η²:η¹ coordination mode in 2. Magnetic property measurements and the fitting of various temperature magnetic susceptibilities revealed antiferromagnetic coupling between metal centers with the negative coupling parameters in both 1 and 2.

( E )-喹啉-2-甲醛肟 (Hqcah) 与 Ni(ClO ₄ ) ₂ ·6H ₂ O 和 NH ₄ SCN 以及与 Ni(CF ₃ SO ₃ ) ₂和 NaN _{3 的反应}导致了两个孤立的金属冠（ MCs) ([Ni ₅ (qcah) ₇ (Hqcah)(CH ₃ OH)(SCN)(OH)]·ClO ₄ (1)和[Ni ₄ (qcah) ₄ (N ₃ ) ₄ (Py) ₄ ] ( 2) , 分别. 复数1是一个五核镍簇，具有两个“稠合”的 9-MC-3 结构单元，两个环均具有 Ni2–N–O–Ni1–N–O–Ni5–O–N 和 Ni3–N–O–Ni4–O– Ni5–O–N 连接。配合物2由四个 [Ni(qcah)(N ₃ )(Py)] 单元组成，相邻的镍原子通过 N-O 基团连接在一起以构建四核 12-MC-4 金属冠。所述配体显示出μ ₃：η ²：η ¹：η ¹，μ ₂：η ²：η ¹和μ ₁：η ²配位模式在1和μ ₂：η ²：η ¹在协调模式2。磁性测量和各种温度磁化率的拟合揭示了金属中心之间的反铁磁耦合，在1和2中都具有负耦合参数。