. 2014 May 18;20(26):8149–8160. doi: 10.1002/chem.201304013

Table 1.

Chemical shifts and relative proportions of Tⁿ and Qⁿ species in Class II γ-PGA/bioactive silica hybrids synthesised with calcium chloride (2ECCa_Cl) or calcium methoxyethoxide (2ECCa_ME) or without calcium (2EC) with processing temperatures of 60 °C. Samples where HF was not added are marked with ^*. The errors in the chemical shift (δ) is ±0.5 ppm, in the intensity is ±1 %, in the ratios is ±0.05 and in D_c is ±3 %

Samples	T²		T³		Q²		Q³		Q⁴		T³/T^tot	Q⁴/Q^tot	D_c
	δ	I	δ	I	δ	I	δ	I	δ	I
	[ppm]	[%]	[ppm]	[%]	[ppm]	[%]	[ppm]	[%]	[ppm]	[%]
2EC	–	0.0	−65.4	11.7	–	0.0	−103.0	18.1	−112.4	70.2	1.0	0.8	95
2ECCa_Cl	−58.0	8.0	−65.1	13.0	−93.1	5.2	−101.3	29.2	−109.8	44.6	0.6	0.6	87
2ECCa_ME	−59.0	2.0	−66.9	13.9	−94.4	3.8	−102.5	30.5	−111.4	49.7	0.9	0.6	90
2ECCa_ME^*	−61.4	6.9	−68.2	9.9	−95.0	13.4	−103.0	33.2	−112.2	36.5	0.6	0.4	83