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Two polymorphic Fe II  coordination polymers [Fe II L (TPPE) 0.5 ]  1 ) and [(Fe II   3 L 3  (TPPE) 1.5 )]  2 ), were obtained from a redox-active tetrathiafulvalene (TTF) functionalized ligand [H 2 L = 2,2’-(((2-(4,5-bis-(methylthio)-1,3-dithiol-2-ylidene)benzo(d) (1,3) dithiole-5,6-diyl)bis-(azanediyl))bis-(meth anylylidene)) (2E,2E')-bis(3-oxobutanoate)] and a highly luminescent connector {TPPE = 1,1,2,2-tetrakis[4-(pyridine-4-yl)phenyl]-ethene}. Complex  1  has a layered structure where the TPPE uses its four diverging pyridines from the TPPE ligand are coordinated by the  trans  positions to the flat TTF Schiff-base ligand, and complex  2  has an unprecedented catenation of layers within two interpenetrated frameworks. These coordination polymers reserved the redox activity of the TTF unit. Complex  1  shows gradual spin transition behavior without hysteresis. And the fluorescence intensity of TPPE in  1  changes in tandem with the spin crossover (SCO) transition indicating a possible interplay between fluorescence and SCO behavior.

Iron(II) Spin Crossover Coordination Polymers Derived From a Redox Active Equatorial Tetrathiafulvalene Schiff-Base Ligand