A Polymorph of K₄Ge₄Se₁₀

Amitava Choudhury; Sabine Strobel; Peter K. Dorhout

doi:10.1107/S1600536807023264

A Polymorph of K₄Ge₄Se₁₀

Amitava Choudhury
, Sabine Strobel
, Peter K. Dorhout

Chemistry

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

Abstract

A new monoclinic polymorph, ?-K4Ge4Se10 (tetra-potassium deca-selenidotetra-germanate), that crystallizes in space group P21/c has been isolated. The structure contains isolated super-tetra-hedral adamantane [Ge4Se10] ^4- clusters identical to those in the known K4Ge4Se10 polymorph (P21/m), held together in in the crystal structure by ionic inter-action with the K ⁺ ions. The adamantane unit, [Ge4Se10] ^4- , is formed by corner-sharing of four GeSe4 tetra-hedra, with average Ge -. Se distances of 2.378 and 2.281 Å for (Ge - Se)endo and (Ge - Se)exo, respectively. There are four crystallographically distinct K ⁺ ions in ?-K4Ge4Se10 having coordination numbers of 5, 7. and 8 ( 2), with K - Se distances in the range 2.986 (2)-3.888 (1) Å, while the coordination numbers of the three unique K ⁺ ions in the known K4Ge4Se10 (P21/m) vary between 5. and 7. Besides the differences in coordination numbers of K ⁺ ions, the two polymorphs also exhibit a. different packing of the adamantane units.

Original language	American English
Journal	Acta Crystallographica Section E: Structure Reports Online
Volume	63
DOIs	https://doi.org/10.1107/S1600536807023264
State	Published - Jun 1 2007

Keywords

Tetra

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Chemistry

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title = "A Polymorph of K₄Ge₄Se₁₀",

abstract = " A new monoclinic polymorph, ?-K4Ge4Se10 (tetra-potassium deca-selenidotetra-germanate), that crystallizes in space group P21/c has been isolated. The structure contains isolated super-tetra-hedral adamantane [Ge4Se10] 4- clusters identical to those in the known K4Ge4Se10 polymorph (P21/m), held together in in the crystal structure by ionic inter-action with the K + ions. The adamantane unit, [Ge4Se10] 4- , is formed by corner-sharing of four GeSe4 tetra-hedra, with average Ge -. Se distances of 2.378 and 2.281 {\AA} for (Ge - Se)endo and (Ge - Se)exo, respectively. There are four crystallographically distinct K + ions in ?-K4Ge4Se10 having coordination numbers of 5, 7. and 8 ( 2), with K - Se distances in the range 2.986 (2)-3.888 (1) {\AA}, while the coordination numbers of the three unique K + ions in the known K4Ge4Se10 (P21/m) vary between 5. and 7. Besides the differences in coordination numbers of K + ions, the two polymorphs also exhibit a. different packing of the adamantane units.",

keywords = "Tetra",

author = "Amitava Choudhury and Sabine Strobel and Dorhout, \{Peter K.\}",

year = "2007",

month = jun,

day = "1",

doi = "10.1107/S1600536807023264",

language = "American English",

volume = "63",

journal = "Acta Crystallographica Section E: Structure Reports Online",

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TY - JOUR

T1 - A Polymorph of K₄Ge₄Se₁₀

AU - Choudhury, Amitava

AU - Strobel, Sabine

AU - Dorhout, Peter K.

PY - 2007/6/1

Y1 - 2007/6/1

N2 - A new monoclinic polymorph, ?-K4Ge4Se10 (tetra-potassium deca-selenidotetra-germanate), that crystallizes in space group P21/c has been isolated. The structure contains isolated super-tetra-hedral adamantane [Ge4Se10] 4- clusters identical to those in the known K4Ge4Se10 polymorph (P21/m), held together in in the crystal structure by ionic inter-action with the K + ions. The adamantane unit, [Ge4Se10] 4- , is formed by corner-sharing of four GeSe4 tetra-hedra, with average Ge -. Se distances of 2.378 and 2.281 Å for (Ge - Se)endo and (Ge - Se)exo, respectively. There are four crystallographically distinct K + ions in ?-K4Ge4Se10 having coordination numbers of 5, 7. and 8 ( 2), with K - Se distances in the range 2.986 (2)-3.888 (1) Å, while the coordination numbers of the three unique K + ions in the known K4Ge4Se10 (P21/m) vary between 5. and 7. Besides the differences in coordination numbers of K + ions, the two polymorphs also exhibit a. different packing of the adamantane units.

AB - A new monoclinic polymorph, ?-K4Ge4Se10 (tetra-potassium deca-selenidotetra-germanate), that crystallizes in space group P21/c has been isolated. The structure contains isolated super-tetra-hedral adamantane [Ge4Se10] 4- clusters identical to those in the known K4Ge4Se10 polymorph (P21/m), held together in in the crystal structure by ionic inter-action with the K + ions. The adamantane unit, [Ge4Se10] 4- , is formed by corner-sharing of four GeSe4 tetra-hedra, with average Ge -. Se distances of 2.378 and 2.281 Å for (Ge - Se)endo and (Ge - Se)exo, respectively. There are four crystallographically distinct K + ions in ?-K4Ge4Se10 having coordination numbers of 5, 7. and 8 ( 2), with K - Se distances in the range 2.986 (2)-3.888 (1) Å, while the coordination numbers of the three unique K + ions in the known K4Ge4Se10 (P21/m) vary between 5. and 7. Besides the differences in coordination numbers of K + ions, the two polymorphs also exhibit a. different packing of the adamantane units.

KW - Tetra

UR - https://scholarsmine.mst.edu/chem_facwork/1962

U2 - 10.1107/S1600536807023264

DO - 10.1107/S1600536807023264

M3 - Article

VL - 63

JO - Acta Crystallographica Section E: Structure Reports Online

JF - Acta Crystallographica Section E: Structure Reports Online

ER -

A Polymorph of K₄Ge₄Se₁₀

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