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Insight into the Mechanochemical Synthesis and Structural Evolution of Hybrid Organic–Inorganic Guanidinium Lead(II) Iodides
Author(s) -
Wilke Manuel,
Casati Nicola
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201804066
Subject(s) - nucleation , stoichiometry , chemistry , diffraction , crystallography , x ray crystallography , synchrotron , crystal structure , ionic bonding , powder diffraction , inorganic chemistry , ion , organic chemistry , physics , nuclear physics , optics
The in situ investigations of the mechanochemical synthesis of four hybrid organic–inorganic lead(II) iodides with the formula (C(NH 2 ) 3 ) n PbI 2+ n ( n= 1 , 2 , 3 , and 4 ) are presented. Synchrotron X‐ray diffraction data show that the four guanidinium lead(II) iodides easily convert into each other. Although the end product is dictated by the initial stoichiometry, complex pathways were found with different behaviors of the compounds in terms of nucleation, growth, and intermediate formation. This appears to be linked to the respective structural features of the different compounds, especially the connectivity of the inorganic framework and the strength of ionic interactions. High‐temperature studies were conducted on compounds 1 , 3 , and 4 to reveal the new phases 1‐II , 3‐II , and 3‐III . Unknown structures were solved from single‐crystal analysis and powder X‐ray diffraction.