Production of novel organic semiconductor nanomaterials is essential for enabling the development
of personal, portable and °exible electronic modules. This work presents Ni(II)-Schi® base
complexes with enhanced Seebeck coe±cient and weak ferromagnetic ordering for thermoelectric
and magnetic devices. Four Ni(II)-Schi® base complexes (namely [Ni(C12H10N3O4Br)]2H2O,
[Ni(C16H11N3O4
Þ]2H2O, [Ni(C21H14N5O8Br)] and [Ni(C25H17N5O8
Þ]1=2H2O) have been synthesized
in nanosized dimensions. The electrical and thermoelectric properties have been studied,
and comprehensive discussions have been presented to understand the electrical conduction
mechanisms. The electrical conductivity measurements reveal that the conduction is due to the
charge carriers hoping between the atomic sites of the same energy levels in the molecule as well as
the transfer of the charge carriers between the neighboring complex molecules due to overlapping
of their orbitals. The thermoelectric measurement con¯rms that the nanocomplexes (NCs) are
non-degenerate P-type semiconductors with enhanced Seebeck coe±cient values compared with
those reported for other organic materials. The NCs exhibit antiferromagnetic to paramagnetic
transitions with the increase of temperature and weak ferromagnetic ordering at 300 K.