Boroselenite Explained

The boroselenites are heteropoly anion chemical compounds containing selenite and borate groups linked by common oxygen atoms. They are not to be confused with the boroselenates with have a higher oxidation state for selenium, and extra oxygen. If selenium is replaced by sulfur, it would be a borosulfite. Boroselenites are distinct from selenoborates in which selenium replaces oxygen in borate, or perselenoborates which contain Se-Se bonds as well as Se-B bonds. The metal boroselenites were only discovered in 2012.

List

name	chem	mw	crystal system	space group	unit cell Å	volume	density	comment	references
boroseleniteselenate	B2Se3O10		monoclinic	P21/c	a = 4.3466, b = 7.0237, c = 22.1460, β = 94.922; Z = 4				^[1]
	Se2B2O7	291.54	orthorhombic	P212121	a=7.4815 b=7.8984 c=9.0478 Z=4	534.65	3.622	NLO 2.2 x KDP; band gap 4.64 eV; colourless	^[2]
	Li2SeB8O15	419.32	monoclinic	P21/c	a=8.641 b=16.282 c=8.415 β=94.426 Z=4	1180.4	2.350	3D;stable to 280 °C; band gap 4.81 eV	^[3]
	NaSeB3O7	246.38	monoclinic	P21/c	a=4.470 b=15.810 c=8.645 β=98.75 Z=4	603.8	2.710	layered;stable to 290 °C; band gap 4.36
	KSeB3O7	262.49	monoclinic	P21/c	a=4.5569 b=17.601 c=8.669 β=95.92 Z=4	691.6	2.521	layered stable to 280 °C; band gap 4.30
	K2Se3B2O10	496.70	orthorhombic	Pnma	a=14.1842 b=15.7516 c=4.7103 Z=4	1052.39	3.135	1D; stable to 330 °C; band gap 4.75 eV
	RbSe3B2O9(OH)		orthorhombic	P212121	a=4.6591 b=11.9288 c=16.332 Z=2	907.7	3.695	band gap 3.79 eV	^[4]
	CsSe3B2O9(OH)		orthorhombic	P212121	a=4.671 b=12.236 c=16.417 Z=2	1104.84	3.911	band gap 4.17 eV; SHG 0.8 x KDP
	Bi2[B<sub>2</sub>(SeO<sub>3</sub>)<sub>6</sub>]	600.67	monoclinic	P21/c	a=7.4594 b=7.5056 c=13.2486 β=90.04 Z=4	741.75	5.379	birefringence at 1064 nm is 0.090; 0D	^[5]

Notes and References

1. Daub. Michael. Scherer. Harald. Hillebrecht. Harald. 2015-03-02. Synthesis, Crystal Structure, and Spectroscopy of the Mixed-Valent Boroseleniteselenate B 2 Se 3 O 10. Inorganic Chemistry. en. 54. 5. 2325–2330. 10.1021/ic502916j. 25695146. 0020-1669.
2. Kong. Fang. Huang. Shu-Ping. Sun. Zhong-Ming. Mao. Jiang-Gao. Cheng. Wen-Dan. June 2006. Se 2 (B 2 O 7): A New Type of Second-Order NLO Material. Journal of the American Chemical Society. en. 128. 24. 7750–7751. 10.1021/ja0620991. 16771484. 0002-7863.
3. Zhang. Jian-Han. Kong. Fang. Yang. Bing-Ping. Mao. Jiang-Gao. 2012. A series of boroselenite-based open frameworks mediated by the cationic sizes of the alkali metals. CrystEngComm. en. 14. 24. 8727. 10.1039/c2ce26524a. 1466-8033.
4. Zhang. Jian-Han. Wang. Qi-Bing. Chen. Chun-Le. Luo. Ju-Xiang. Hu. Chun-Li. Song. Jun-Ling. Mao. Jiang-Gao. 2018. RbSe 3 B 2 O 9 (OH) and CsSe 3 B 2 O 9 (OH): one dimensional boroselenite-based anionic frameworks with second harmonic generation properties. Dalton Transactions. en. 47. 16. 5764–5770. 10.1039/C8DT00390D. 29637203. 1477-9226.
5. Tang. Ru-Ling. Hu. Chun-Li. Xie. Wei-Jie. Huang. Qian-Ming. Mao. Jiang-Gao. 2021-03-02. Bi 2 [B 2 (SeO 3) 6 ]

   A Metal Boroselenite with a Unique Zero-Dimensional [B 2 (SeO 3) 6 ] 6– Anionic Group and Large Birefringence]

   . Inorganic Chemistry. 60. 6. en. 3539–3542. 10.1021/acs.inorgchem.1c00210. 33650857. 232088560. 0020-1669.