Synthesis, Crystal Structure and Properties of Iron Bisdicyanamide (Fe[N(CN)2]2) and Iron Diammin Bisdicyanamide (Fe[NH3]2[N(CN)2]2)
Preprint
- 24 July 2026
- preprint
- Published by MDPI AG in Preprints.org
Abstract
The phase-pure syntheses of Fe(dca)₂ and Fe(dca)₂(NH₃)₂ have enabled comprehensive investigation of their structural and magnetic properties. Fe(dca)₂ crystallizes in the orthorhombic space group Pnnm, with Fe²⁺ ions octahedrally coordinated by six dca ligands, forming a rutile-like 3D network. Temperature-dependent structural analysis reveals minor distortions and a slight unit cell volume contraction (~2.5 ų) from 300 K to 25 K. Fe(dca)₂(NH₃)₂ crystallizes in the monoclinic space group P2₁/c, featuring two axial ammonia ligands and dca-bridged Fe²⁺ ions forming layers. Magnetic susceptibility measurements of Fe(dca)₂ reveal a ferrimagnetic transition at TC = 19.1 K, con-firmed by SQUID data, Mößbauer spectroscopic measurements and low-temperature neutron diffraction. A magnetic hysteresis at 5 K indicates long-range cooperative magnetic ordering. ATR-IR spectroscopic measurements support the structural models and confirm the chemical composition of both compounds. TGA shows the thermal decomposition of Fe(dca)₂.Keywords
All Related Versions
- Version 1, 2026-07-24, Preprints
- Published version: Inorganics, 14 (8), 218.
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