Synthesis of a Stable Compound with Fivefold Bonding between Two Chromium(I) Centers

Tailuan Nguyen; Andrew D. Sutton; Marcin Brynda; James C. Fettinger; Gary J. Long; Philip P. Power

doi:10.1126/science.1116789

Synthesis of a Stable Compound with Fivefold Bonding between Two Chromium(I) Centers

Tailuan Nguyen
, Andrew D. Sutton
, Marcin Brynda
, James C. Fettinger
, Gary J. Long
, Philip P. Power

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

Although, in principle, transition metals can form bonds with 6 shared electron pairs, only quadruply-bonded compounds can be isolated as stable species at room temperature. Now, reduction of {Cr(µ-Cl)Ar'}2 (Ar' = C6H3-2,6(C6H3-2,6-Pri2)2 Pri = isopropyl) with a slight excess of potassium graphite has produced a stable compound with fivefold Cr-Cr bonding. The very air and moisture sensitive, dark red crystals of Ar'CrCrAr' were isolated in >40% yield. X-ray diffraction revealed a Cr-Cr bond length of 1.8351(4) angstroms and a planar, trans-bent core geometry. These data, together with its temperature independent paramagnetism, as well as computational studies, support sharing of 5 electron pairs in 5 bonding molecular orbitals between two 3d5 chromium(I) ions.

Original language	American English
Journal	Science
DOIs	https://doi.org/10.1126/science.1116789
State	Published - Jan 1 2005

Keywords

Crystals

Disciplines

Chemistry

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title = "Synthesis of a Stable Compound with Fivefold Bonding between Two Chromium(I) Centers",

abstract = " Although, in principle, transition metals can form bonds with 6 shared electron pairs, only quadruply-bonded compounds can be isolated as stable species at room temperature. Now, reduction of \{Cr(µ-Cl)Ar'\}2 (Ar' = C6H3-2,6(C6H3-2,6-Pri2)2 Pri = isopropyl) with a slight excess of potassium graphite has produced a stable compound with fivefold Cr-Cr bonding. The very air and moisture sensitive, dark red crystals of Ar'CrCrAr' were isolated in >40\% yield. X-ray diffraction revealed a Cr-Cr bond length of 1.8351(4) angstroms and a planar, trans-bent core geometry. These data, together with its temperature independent paramagnetism, as well as computational studies, support sharing of 5 electron pairs in 5 bonding molecular orbitals between two 3d5 chromium(I) ions.",

keywords = "Crystals",

author = "Tailuan Nguyen and Sutton, \{Andrew D.\} and Marcin Brynda and Fettinger, \{James C.\} and Long, \{Gary J.\} and Power, \{Philip P.\}",

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doi = "10.1126/science.1116789",

language = "American English",

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TY - JOUR

T1 - Synthesis of a Stable Compound with Fivefold Bonding between Two Chromium(I) Centers

AU - Nguyen, Tailuan

AU - Sutton, Andrew D.

AU - Brynda, Marcin

AU - Fettinger, James C.

AU - Long, Gary J.

AU - Power, Philip P.

PY - 2005/1/1

Y1 - 2005/1/1

N2 - Although, in principle, transition metals can form bonds with 6 shared electron pairs, only quadruply-bonded compounds can be isolated as stable species at room temperature. Now, reduction of {Cr(µ-Cl)Ar'}2 (Ar' = C6H3-2,6(C6H3-2,6-Pri2)2 Pri = isopropyl) with a slight excess of potassium graphite has produced a stable compound with fivefold Cr-Cr bonding. The very air and moisture sensitive, dark red crystals of Ar'CrCrAr' were isolated in >40% yield. X-ray diffraction revealed a Cr-Cr bond length of 1.8351(4) angstroms and a planar, trans-bent core geometry. These data, together with its temperature independent paramagnetism, as well as computational studies, support sharing of 5 electron pairs in 5 bonding molecular orbitals between two 3d5 chromium(I) ions.

AB - Although, in principle, transition metals can form bonds with 6 shared electron pairs, only quadruply-bonded compounds can be isolated as stable species at room temperature. Now, reduction of {Cr(µ-Cl)Ar'}2 (Ar' = C6H3-2,6(C6H3-2,6-Pri2)2 Pri = isopropyl) with a slight excess of potassium graphite has produced a stable compound with fivefold Cr-Cr bonding. The very air and moisture sensitive, dark red crystals of Ar'CrCrAr' were isolated in >40% yield. X-ray diffraction revealed a Cr-Cr bond length of 1.8351(4) angstroms and a planar, trans-bent core geometry. These data, together with its temperature independent paramagnetism, as well as computational studies, support sharing of 5 electron pairs in 5 bonding molecular orbitals between two 3d5 chromium(I) ions.

KW - Crystals

UR - https://scholarsmine.mst.edu/chem_facwork/130

UR - https://doi.org/10.1126/science.1116789

U2 - 10.1126/science.1116789

DO - 10.1126/science.1116789

M3 - Article

SN - 1095-9203

JO - Science

JF - Science

ER -

Synthesis of a Stable Compound with Fivefold Bonding between Two Chromium(I) Centers

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