Potassium trispyrazolylborate

Potassium trispyrazolylborate
Names
Preferred IUPAC name
Potassium tri(1H-pyrazol-1-yl)boranuide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.203.487 Edit this at Wikidata
  • InChI=1S/C9H10BN6.K/c1-4-11-14(7-1)10(15-8-2-5-12-15)16-9-3-6-13-16;/h1-10H;/q-1;+1 X markN
    Key: IBNGZWIUPDMZMG-UHFFFAOYSA-N X markN
  • InChI=1/C9H10BN6.K/c1-4-11-14(7-1)10(15-8-2-5-12-15)16-9-3-6-13-16;/h1-10H;/q-1;+1
    Key: IBNGZWIUPDMZMG-UHFFFAOYAZ
  • [H][B-](N1N=CC=C1)(N2N=CC=C2)N3N=CC=C3.[K+]
  • [BH-](n1cccn1)(n2cccn2)n3cccn3.[K+]
Properties
C9H10BKN6
Molar mass 252.13 g·mol−1
Melting point 188 to 189 °C (370 to 372 °F; 461 to 462 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Potassium trispyrazolylborate, commonly abbreviated KTp, is the potassium salt with the formula KHB(C3N2H3)3. This salt is the source of the trispyrazolylborate ligand.

KTp is a white crystalline solid that is soluble in polar solvents, alcohols, and water. The synthesis of KTp involves potassium borohydride and pyrazole without a solvent.

KBH4 + 3 C3N2H4 → KHB(C3N2H3)3 + 3 H2
Idealized structure of a Tp ligand bound to a metal center MLn.

The tris(pyrazolyl)borate forms octahedral coordination compounds with the formula M[Tp]2 with first-row transition metals. KTp also forms 1:1 complexes, for example it can be converted to K[TpMo(CO)3];

KTp + Mo(CO)6 → K[TpMo(CO)3] + 3 CO

When K[TpMo(CO)3] is treated with butyl nitrite it yields the neutral orange complex TpMo(CO)2NO.

K[TpMo(CO)3] + BuONO → TpMo(CO)2NO + CO + KOBu

References

  1. 1 2 Trofimenko, Swiatoslaw (1967). "Boron-pyrazole chemistry. II. Poly(1-pyrazolyl)-borates". Journal of the American Chemical Society. 89 (13): 3170–3177. doi:10.1021/ja00989a017.
  2. ↑ Trofimenko, Swiatoslaw (1970). "Poly(1-pyrazolyl)borates, Their Transition-Metal Complexes, and Pyrazaboles". Inorganic Syntheses. Vol. 12. pp. 99–109. doi:10.1002/9780470132432.ch18. ISBN 9780470132432.
  3. ↑ Trofimenko, Swiatoslaw (1999). Scorpionates: Polypyrazolylborate Ligands and Their Coordination Chemistry. World Scientific Publishing Company. ISBN 978-1860941726.