[Fe(II)(TRIM)(2)]F(2), the First Example of Spin Conversion Monitored by Molecular Vibrations.

The new [Fe(II)(TRIM)(2)]F(2) spin-crossover complex (TRIM = 4-(4-imidazolylmethyl)-2-(2-imidazolylmethyl)imidazole) has been synthesized, crystallizing in the monoclinic system, space group P2/n, with Z = 2, a = 9.798(2) Å, b = 8.433(2) Å, c = 14.