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. 2020 May 4;59(10):7227–7237. doi: 10.1021/acs.inorgchem.0c00667

Table 2. Selected Bond Lengths (Å) in 1–6 and Related Dicyanamide Salts.

  Ln–O(W) Ln–N(t)a Ln–N(m)a DCA– modeb
Sr[N(CN)2]243   2.622(5)–2.738(4) 2.771(4) D
Ba[N(CN)2]243   2.827(1)–2.923(2) 2.935(2)–2.993(2) D
La[N(CN)2]3c,32   2.62(2)–2.68(2) 2.38(4)–2.82(2) D
Eu[N(CN)2]3c,32   2.38(4)–2.50(2) 2.72(3)–2.88(2) D
Eu[N(CN)2]3·2H2O33 2.37(4)–2.41(6) 2.49(1)–2.62(2)   B
1a 2.460(5) 2.581(5)   A
1b 2.475(4)–2.502(4) 2.594(6)–2.675(8) 2.867(5) B + D
2 2.35(2)–2.44(3) 2.47(3)–2.56(3)   A
3 2.32(1)–2.41(1) 2.48(1)–2.51(1)   A
4 2.27(1)–2.41(1) 2.43(1)–2.48(1)   A
5 2.27(1)–2.39(1) 2.41(1)–2.49(4)   A
6 2.259(4)–2.314(3) 2.405(4)–2.431(3)   A
a

t, terminal; m, middle.

b

Please refer to Scheme 1.

c

Geometry of the DCA– ligand significantly differs from the usual geometry.