The magnetic characteristics of the molecular magnet ${[{\mathrm{Fe}}^{II}(\ensuremath{\Delta}){\mathrm{Fe}}^{II}(\ensuremath{\Lambda}){(\mathrm{ox})}_{2}{(\text{Phen})}_{2}]}_{n}$, having chemical formula ${\mathrm{C}}_{28}{\mathrm{H}}_{16}{\mathrm{Fe}}_{2}{\mathrm{N}}_{4}{\mathrm{O}}_{8}$ for unity, has been studied by magnetization, neutron diffraction, and field-dependent specific heat-measurements. In the high-temperature regime $(Tg{T}_{m})$, the one-dimensional Ising chain model with alternate Land\'e factors is applied to describe its quasiferrimagnetic behavior as temperature approaches ${T}_{m}$. In the low-temperature region $(Tl{T}_{m})$, the increase of interchain interactions gives rise to long-range magnetic ordering as indicated by an anomaly in specific heat. Furthermore, an intrinsic antiparallel alignment of spins with a net ferrimagnetic structure is deduced from neutron diffraction study. The field-dependent $\ensuremath{\lambda}$-type anomaly of specific heat indicates that applying a magnetic field raises magnetic ordering temperature. An additional small anomaly in specific heat is also seen below ${T}_{m}$, which could be due to the zero-field splitting caused by the internal crystal field.