Wang T, Yao B, Guo Z, Chang X, Deng YF, Zhang YZ. Self-assembly of Ni(II) metallacycles (a square and a triangle) supported by tetrazine radical bridges.
Dalton Trans 2022;
51:7644-7649. [PMID:
35510917 DOI:
10.1039/d2dt00221c]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Two Ni(II) molecular metallacycles of [Ni4(bpz*tz˙-)4(N3)4] (1) and [Ni3(bpzPhtz˙-)3(pzPh(Cl)tz˙-)3]·1.3CH3OH·9.3H2O (2) (bpz*tz = 3,6-bis(3,5-dimethyl-pyrazolyl)-1,2,4,5-tetrazine; bpzPhtz = 3,6-bis(3-phenyl-pyrazolyl)-1,2,4,5-tetrazine; and pzPh(Cl)tz = 3-bis(3-phenyl-pyrazolyl)-6-Cl-1,2,4,5-tetrazine) are reported. The single-crystal X-ray diffraction study reveals that 1 displays a square structure while 2 shows a triangle structure due to the steric effect, both bearing tetrazine radical bridges. Furthermore, magnetic studies reveal that the Ni-radical interaction in 1 is strongly ferromagnetic with a coupling constant (J) of 90.8 cm-1 in the 2J formalist, while the overall antiferromagnetic behaviour of 2 is presumably due to the compete ferromagnetic (for the Ni-radicalbridging interaction with J1 = 95.4 cm-1) and antiferromagnetic (for the Ni-radicalterminal interaction, J2 = -57.5 cm-1) couplings.
Collapse