New Metal
Phthalocyanines/Metal Simple Hydroxide Multilayers:
Experimental Evidence of Dipolar Field-Driven Magnetic Behavior
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Abstract
A series of new hybrid multilayers
has been synthesized by insertion-grafting
of transition metal (Cu<sup>II</sup>, Co<sup>II</sup>, Ni<sup>II</sup>, and Zn<sup>II</sup>) tetrasulfonato phthalocyanines between layers
of Cu<sup>II</sup> and Co<sup>II</sup> simple hydroxides. The structural
and spectroscopic investigations confirm the formation of new layered
hybrid materials in which the phthalocyanines act as pillars between
the inorganic layers. The magnetic investigations show that all copper
hydroxide-based compounds behave similarly, presenting an overall
antiferromagnetic behavior with no ordering down to 1.8 K. On the
contrary, the cobalt hydroxide-based compounds present a ferrimagnetic
ordering around 6 K, regardless of the nature of the metal phthalocyanine
between the inorganic layers. The latter observation points to strictly
dipolar interactions between the inorganic layers. The amplitude of
the dipolar field has been evaluated from X-band and Q-band EPR spectroscopy
investigation (<i>B</i><sub>dipolar</sub> ≈ 30 mT)