Abstract
Two new cobalt(
ii
) MOFs, namely [Co
2
(L)
2
(4,4′-bipy)]
n
(1) and {[Co(L)(dib)
0.5
(H
2
O)
2
]·H
2
O}
n
(2), were obtained by the self-assembly of Co(NO
3
)
2
·6H
2
O with V-shaped 2,4-[6-(4-carboxyphenyl)pyrazin-2-yl]benzoic acid (H
2
L) in the presence of two bridging auxiliary N-donor linkers, 1,4-di(1
H
-imidazole-1-yl) benzene (dib) and 4,4′-bipyridine (4,4′-bipy). 1 is a 3D (3,4)-connected framework containing 2-fold interpenetration, while 2 features an infinite 2D network structure with [Co
2
(μ
2
-O)
2
]
4+
subunits. The structural diversity of the two MOFs suggests that different auxiliary linkers can induce different conformations and coordination modes of H
2
L and have an influence on the resulting networks. A computational study of Hirshfeld surface analysis was also conducted. In addition, the magnetic properties of 1 and 2 were investigated in detail, which revealed the ferromagnetic and antiferromagnetic interactions that occurred between Co(
ii
) centers in 1 and 2, respectively.