Synthesis of Indium Complexes for Thin Film Transistor Applications Bearing N‐Alkoxy Carboxamide Ligands

Abstract

By reacting equimolar amount of trimethylindium with various N-alkoxy carboxamidate type-ligands in a single step reaction, new series of indium complexes (1-3), [In(CH 3 ) 2 (L)] 2 (L 1 H = Nmethoxypropionamide (mpaH), L 2 H = N-ethoxy-2-methyl propanamide (empaH), L 3 H = N-ethoxy-2,2-dimethyl propanamide (edpaH)), were successfully synthesized. All complexes were fully characterized by FTIR and NMR spectroscopy along with elemental and thermogravimetric (TG) analyses. While complex 1 and 2 were solid in room temperature, complex 3 which relatively bulkier ligand L 3 H was introduced was in liquid state. Among them, complex 1 was structurally characterized by single crystal X-ray diffraction. Complex 1 existed in a tetragonal I4(1)/a space group that consist of a pair enantiomers. A sharp weight loss between 130 8C and 230 8C in a single step in TGA for all complexes showed outstanding volatility properties with lowest residual mass of 10% which are a crucial factor in thin film industry.[a] Dr.

Synthesis of New Heteroleptic Indium Complexes as Potential Precursors for Indium Oxide Thin Films

“…The bond lengths of In1−C1, In1−C2, In1−O1, In1−O1 i , and In1−O2 are 2.132(3), 2.127(3), 2.2160(19), 2.3288(18), and 2.388(2) Å, respectively. Additionally, the bond distances between the indium and oxygen atoms (O1, O1 i , and O2) are relatively shorter than those of the previously reported indium complex [In(CH 3 ) 2 (mpa)] 2 [In1−O1=2.317(1), In1−O1 i =2.193(2), and In1−O2 i =2.429(2) Å] [23] …”

“…At the same time, each five‐coordinated indium metal atom can be described as having a distorted trigonal bipyramidal geometry with the methyl groups in the axial positions, while O1, O1 i , and O2 are located in the equatorial positions. The angle of the axial bond, C1−In1−C2, is 141.38(16)°, which is smaller than that of the previously known indium complex bearing N ‐alkoxy carboxamide ligand, [In(CH 3 ) 2 (mpa)] 2 [C1−In1−C2=143.0(1)°] [23] . The bond lengths of In1−C1, In1−C2, In1−O1, In1−O1 i , and In1−O2 are 2.132(3), 2.127(3), 2.2160(19), 2.3288(18), and 2.388(2) Å, respectively.…”

“…The N ‐alkoxy carboxamide ligands were synthesized by the literature method that was previously reported for the synthesis of tin(II) and germanium(II) complexes [22] . The [Me 2 In(edpa)] 2 complex was prepared by a previously reported method, and a new indium complex, [Me 2 In(mdpa)] 2 ( 1 ), was also synthesized by an identical method with slight modifications [23] . Bruker 400 MHz and 500 MHz NMR spectrometers were used for measuring 1 H and 13 C NMR with benzene‐ d 6 as the solvent and the standard.…”

Effect of heterocycle content on metal binding isostere coordination

“…The bidentate coordination through the O-methyl hydroxamate has only rarely been observed crystallographically and not in the presence of alternative coordination motifs. 20,21 This bidentate coordination through an ether-like coordination motif (1a and 5a), when there is a suitable nitrogen heterocycle donor available, suggests that the coordination ability of the nitrogen atoms are compromised due to electronic effects. Additionally, it is unlikely that sterics play a signicant role in the observed coordination chemistry, as in the case of comparing the difference in coordination between 1a to 3a, the only difference in both structures is a single atom substitution (N versus S).…”

Group IV Transition Metal (M = Zr, Hf) Precursors for High-κ Metal Oxide Thin Films

“…The novel complexes contain N -alkoxy carboxamidate-type ligands that have not been commonly used in the field of precursor chemistry. These ligand systems have been explored and presented with several metals such as Sn, , Ge, and In, showing improved properties in terms of thermal stability and volatility compared with the existing precursors.…”