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- W2000693138 abstract "The synthesis and characterization of a new series of mono-, di-, and trinuclear Cr(II) borohydride compounds is described. The reaction of CrCl 2 (TMEDA) with two equivalents of NaBH 4 afforded the thermally unstable (TMEDA)Cr(BH 4 ) 2 (1), which was converted by treatment with pyridine into the octahedral monomeric (Py) 4 Cr(BH 4 ) 2 (2). The reaction proceeds via formation of an intermediate trinuclear complex {[(TMEDA)(Py)Cr(η 2 -BH 4 )] 2 [(Py) 2 Cr(η 2 -BH 4 ) 2 ]}(µ,η 1 -BH 4 ) 2 (3), which was isolated and characterized by X-ray crystallography. Reaction of 1 and 2 with both CO 2 and RN=C=NR (R = Cy, iPr) afforded hydride insertion and formation of the corresponding diamagnetic lantern-type Cr(II) formate (HCO 2 ) 4 Cr 2 Py 2 (4) and formamidinate compounds [RNC(H)NR] 2 Cr 2 (µ-BH) 4 (R = Cy (5a), iPr (5b)), respectively, with supershort Cr—Cr quadruple bonds. The structures of 1, 2, 3, and 5b were elucidated by X-ray analysis. Crystal data are as follows. 1: C 6 H 24 N 2 B 2 Cr, monoclinic, Cc, a = 8.517(2) Å, b = 15.921(5) Å, c = 9.624(2) Å, β = 115.59(1)°, Z = 4, R = 0.022, R w = 0.029; 2: C 28 H 44 N 4 B 2 O 2 Cr, monoclinic, P2 1 /n, a = 12.021(1) Å, b = 15.555(1) Å, c = 15.723(1) Å, β = 90.13(2)°, Z = 4, R = 0.074, R w = 0.086; 3: C 32 H 76 N 8 B 6 Cr 3 , monoclinic, P2 1 /n, a = 8.515(1) Å, b = 14.525(1) Å, c = 18.286(2) Å, β = 91.38(1)°, Z = 2, R = 0.051, R w = 0.060; 5b: C 21 H 49 N 6 BCr 2 , monoclinic, C2/c, a = 17.000(1) Å, b = 9.033(1) Å, c = 19.160(1) Å, β = 105.579(9)°, Z = 4, R = 0.069, R w = 0.078. Keywords: divalent chromium, borohydride, Cr—Cr quadruple bond." @default.
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- W2000693138 date "1995-07-01" @default.
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- W2000693138 title "Preparation and characterization of a new series of Cr(II) hydroborates" @default.
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- W2000693138 doi "https://doi.org/10.1139/v95-139" @default.
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