Kristall- und Molekularstrukturen von zwei Carbodiimiden: Bis(diphenylmethyl)carbodiimid und Bis(<i>p</i>-methoxyphenyl)-carbodiimid

Irngartinger, Hermann; Jäger, Herb.

doi:10.1107/s0567740878010626

Cited by 21 publications

(8 citation statements)

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“…The NCN angle α is also of interest. According to XRD data, the carbodiimide group is not linear; α can be as low as 166° for aliphatic- and aromatic-substituted carbodiimides and 172.6° in silylated carbodiimides…”

Section: Theoretical Studies Of the Geometrical Structure And The Ele...mentioning

confidence: 99%

Inorganic Solid-State Chemistry with Main Group Element Carbodiimides

et al. 1998

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Organosilicon carbodiimides have been successfully applied as single-source precursor compounds for the synthesis of novel ternary Si-, C-, and N-containing solid phases. Their thermally induced decomposition gives either amorphous silicon carbonitrides or polycrystalline silicon nitride and silicon carbide mixtures, materials that are presently of technological interest for their exceptional hardness, strength, toughness, and high temperature resistance even in corrosive environments. This review is concerned with the synthesis, characterization, and thermal stability of element carbodiimides. The main part of this paper is focused on polymeric silicon-based carbodiimides obtained by the reaction of chloro(organo)silanes with bis(trimethylsilyl)carbodiimide. In the case of RSiCl 3 , novel poly(silylcarbodiimide) gels are formed. Starting from silicon tetrachloride, new crystalline SiCN phases (namely, SiC 2 N 4 and Si 2 CN 4 ), have been isolated. Their crystal structures as well as their thermal behavior in the range between room temperature and 1600 °C are discussed. Moreover, preliminary results on the synthesis of germanium-and boron-containing carbodiimides are reported. It is also shown that carbon-based carbodiimides can be obtained by the reaction of cyanuric halides with bis(trimethylsilyl)carbodiimide. These materials are investigated as precursors for the synthesis of new carbon nitrides with high hardness.

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Section: Theoretical Studies Of the Geometrical Structure And The Ele...mentioning

confidence: 99%

Inorganic Solid-State Chemistry with Main Group Element Carbodiimides

et al. 1998

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“…Lithium coordination of DCC results in asymmetry in the NCN bonds since C36N3 [1.206(4) Å] is significantly shorter than C36N4 [1.39(1) Å ]. This distortion is also reflected in the inequivalence of the DCC bond angles [C33N4C36, 134.6(8)°] and C37N3C36, 121.4(3)°], the former being notably more obtuse than the CNC bond angles approaching 120° normally seen in carbodiimide ligands . The N3–C36–N4 bond angle in 1 also shows a distortion from linearity [165.4(5)°].…”

Section: Results and Discussionmentioning

confidence: 99%

“…Lithium exhibits a trigonal planar geometry, with bond angles markedly distorted from idealized values 8)°] and C37 N3C36, 121.4(3)°], the former being notably more obtuse than the CNC bond angles approaching 120°normally seen in carbodiimide ligands. 40 The N3−C36−N4 bond angle in 1 also shows a distortion from linearity [165.4(5)°]. These features suggest that the major resonance structure is polarized (Cy)NCN + (Cy) rather than (Cy)NCN(Cy).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Expected and Unexpected Reactivities of Homoleptic LiNacNac and Heteroleptic NacNacMg(TMP) β-Diketiminates toward Various Small Unsaturated Organic Molecules

et al. 2021

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Homoleptic LiNacNac forms simple donor–acceptor complexes with N , N ′-dicyclohexylcarbodiimide (CyN=C=NCy), triphenylphosphine oxide (Ph 3 P=O), and benzophenone (Ph 2 CO). These crystallographically characterized compounds could be regarded as model intermediates en route to reducing the N=C, P=O, and C=O bonds of unsaturated substrates. Heteroleptic NacNacMg(TMP) intriguingly functions as a TMP nucleophile both with t -BuNCO and t -BuNCS, producing a urea or thiourea derivative respectively attached to Mg, though the NacNac ligand in the former reaction also engages noninnocently with a second t -BuNCO molecule via insertion at the reactive NacNac backbone γ-carbon site.

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“…Alkyloder arylsubstituierte Carbodiimide R-N=C=N-R (1) sollten bei sp 2 -hybridisierten NAtomen einen allenartigen, C 2 -symmetrischen Bau aufweisen mit C-N=C-Bindungswinkeln von ca. 120° und einem Torsionswinkel C-N 1 --^2-C von ca.…”

Section: Introductionunclassified

“…90°. Bei den arylierten Carbodiimiden la-d wurde die Struktur durch Röntgenbeugung bestimmt [1][2][3] und diese Erwartung bei den ersten drei Vertretern gut, bei ld zumindest näherungsweise bestä-tigt. In Tab.…”

Section: Introductionunclassified

Kristall-und Molekülstruktur von N,N'-Bis(1,3-dimethylbenzo[b]-1,3,2-diazaboroIidin-2-yl)carbodiimid

Sawitzki

Einholz

Haubold

1988

Zeitschrift Für Naturforschung B

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Crystals of the title compound (2) are monoclinic with a = 905.5(3), b = 593.6(2). c -3243.5(8) pm, ß = 95.63(2)°, Z = 4, space group P2 x ln. The molecule 2 neither has a C 2 -symmetrical allene-type nor a D 2d -symmetrical cumulene-type structure, but it has a non-linear B-N = C=N -B arrangement and is nearly planar. The central N = C=N angle has a value of 171.9(3)°, the B -N = C angles are 145.9(2)° and 163.1(3)°.Einleitung

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Kristall- und Molekularstrukturen von zwei Carbodiimiden: Bis(diphenylmethyl)carbodiimid und Bis(p-methoxyphenyl)-carbodiimid

Cited by 21 publications

References 1 publication

Inorganic Solid-State Chemistry with Main Group Element Carbodiimides

Inorganic Solid-State Chemistry with Main Group Element Carbodiimides

Expected and Unexpected Reactivities of Homoleptic LiNacNac and Heteroleptic NacNacMg(TMP) β-Diketiminates toward Various Small Unsaturated Organic Molecules

Kristall-und Molekülstruktur von N,N'-Bis(1,3-dimethylbenzo[b]-1,3,2-diazaboroIidin-2-yl)carbodiimid

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