A new class of CVD precursors to metal borides: Cr(B3H 8)2 and related octahydrotriborate complexes

Dean M. Goedde; Gregory S. Girolami

doi:10.1021/ja046906c

A new class of CVD precursors to metal borides: Cr(B₃H ₈)₂ and related octahydrotriborate complexes

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Abstract

Treatment of CrCl₃ with sodium octahydrotriborate, NaB₃H₈, affords a thermally unstable purple liquid thought to be a chromium(III) hydride of stoichiometry CrH(B₃H₈)₂. This hydride converts rapidly at room temperature to the chromium(II) complex Cr(B₃H₈)₂, which adopts a square-planar structure in which four hydrogen atoms form the coordination sphere of the chromium atom. This chromium(II) species forms six-coordinate Lewis base adducts Cr(B₃H₈)₂L₂, where L is Et₂O, thf, or PMe₃; the first two of these adopt trans geometries, whereas the latter is cis. Volatile Cr(B₃H₈)₂ is the first homoleptic transition metal complex of the octahydrotriborate anion, and it readily forms CrB₂ thin films by CVD at 250 °C.

Original language	English (US)
Pages (from-to)	12230-12231
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	126
Issue number	39
DOIs	https://doi.org/10.1021/ja046906c
State	Published - Oct 6 2004

ASJC Scopus subject areas

Catalysis
General Chemistry
Biochemistry
Colloid and Surface Chemistry

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10.1021/ja046906c

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Cite this

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title = "A new class of CVD precursors to metal borides: Cr(B3H 8)2 and related octahydrotriborate complexes",

abstract = "Treatment of CrCl3 with sodium octahydrotriborate, NaB3H8, affords a thermally unstable purple liquid thought to be a chromium(III) hydride of stoichiometry CrH(B3H8)2. This hydride converts rapidly at room temperature to the chromium(II) complex Cr(B3H8)2, which adopts a square-planar structure in which four hydrogen atoms form the coordination sphere of the chromium atom. This chromium(II) species forms six-coordinate Lewis base adducts Cr(B3H8)2L2, where L is Et2O, thf, or PMe3; the first two of these adopt trans geometries, whereas the latter is cis. Volatile Cr(B3H8)2 is the first homoleptic transition metal complex of the octahydrotriborate anion, and it readily forms CrB2 thin films by CVD at 250 °C.",

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AU - Girolami, Gregory S.

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N2 - Treatment of CrCl3 with sodium octahydrotriborate, NaB3H8, affords a thermally unstable purple liquid thought to be a chromium(III) hydride of stoichiometry CrH(B3H8)2. This hydride converts rapidly at room temperature to the chromium(II) complex Cr(B3H8)2, which adopts a square-planar structure in which four hydrogen atoms form the coordination sphere of the chromium atom. This chromium(II) species forms six-coordinate Lewis base adducts Cr(B3H8)2L2, where L is Et2O, thf, or PMe3; the first two of these adopt trans geometries, whereas the latter is cis. Volatile Cr(B3H8)2 is the first homoleptic transition metal complex of the octahydrotriborate anion, and it readily forms CrB2 thin films by CVD at 250 °C.

AB - Treatment of CrCl3 with sodium octahydrotriborate, NaB3H8, affords a thermally unstable purple liquid thought to be a chromium(III) hydride of stoichiometry CrH(B3H8)2. This hydride converts rapidly at room temperature to the chromium(II) complex Cr(B3H8)2, which adopts a square-planar structure in which four hydrogen atoms form the coordination sphere of the chromium atom. This chromium(II) species forms six-coordinate Lewis base adducts Cr(B3H8)2L2, where L is Et2O, thf, or PMe3; the first two of these adopt trans geometries, whereas the latter is cis. Volatile Cr(B3H8)2 is the first homoleptic transition metal complex of the octahydrotriborate anion, and it readily forms CrB2 thin films by CVD at 250 °C.

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