Titanium-49

Properties and data of the isotope ⁴⁹Ti.

Contents

General Data

Parent Nuclides

NMR Data

Isotones und Isobares

Literature

Titanium-49 is a stable isotope of the chemical element titanium, which has 27 neutrons in the atomic nucleus in addition to the element-specific 22 protons, resulting in a mass number of 49. ⁴⁹Ti makes up 5.41% of the composition of Earth´s titanium.

There are no practical applications for the isotopically pure nuclide.

The discovery and mass determination of titanium-47 during the investigation of Titanium tetrafluoride with a spectrograph was reported in 1935 [1].

See also: List of individual Titanium isotopes (and general data sources).

General data

Name of the isotope:Titanium-49; Ti-49Symbol:⁴⁹Ti or 4922TiMass number A:49 (= number of nucleons)Atomic number Z:22 (= number of protons)Neutrons N:27Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.2272727272727 (= neutron-proton ratio)Neutron excess (N-Z):5Isotopic mass:48.94786439(8) u (atomic weight of Titanium-49)Nuclide mass:48.9357959 u (calculated nuclear mass without electrons)Mass excess:-48.56401 MeVMass defect:0.458239046 u (per nucleus)Nuclear binding energy:426.84692191 MeV (per nucleus)
8.71116167 MeV (average binding energy per nucleon)Separation energy:S_N = 8.142379(24) MeV (first neutron)
S_P = 11.349(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)7/2-Isobaric spin: 5/2Magnetic dipole moment:μ(μ_N) = -1.10370(14)Charge radius:3.5733(21) femtometer fmMirror nucleus:Cobalt-49Year of discovery:1934

Parent Nuclides

Direct parent isotopes are: ⁴⁹V, ⁴⁹Sc.

Occurrence

Comparison of the natural Titanium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Titanium Isotopic mixture	47.867 u	100 %
Isotope ⁴⁷Ti	46.95175749(9) u	7.44(2) %	stable	5/2-
Isotope ⁴⁶Ti	45.95262636(10) u	8.25(3) %	stable	0+
Isotope ⁴⁸Ti	47.94794068(8) u	73.72(3) %	stable	0+
Isotope ⁴⁹Ti	48.94786439(8) u	5.41(2) %	stable	7/2-
Isotope ⁵⁰Ti	49.94478562(9) u	5.18(2) %	stable	0+

NMR data

Nuclear magnetic properties and parameters of the NMR active Nuclide ⁴⁹Ti

Isotope:⁴⁹Ti-NMRQuantity:5.41(2) %Spin:7/2-Nuclearmagnetic moment
μ/μ_N:-1.10370(14)Gyromagnetic ratio γ:0 · 10⁷ rad T^-1 s^-1
0.00000 MHz T^-1Nuclear g-factor:g_l = -0.31534285714286Quadrupole moment Q:+ 0.247(11) barn (100 fm²)Resonance frequency:v₀ = 2.4048 MHz at 1 TRelative Sensitivity:[related to ¹H = 1.000]:
0.00378 (H₀ = const.)
1.1861 (v₀ = const.)
0.000205 (at natural abundance)
relative receptivity as compared to ¹³C:
1.20 (at natural abundance)
22.2 (enriched)Reference compound:
(conditions)Pure titanium tetrachloride TiCl₄, mixed with 10% cyclohexane-d12 C₆D₁₂ (for field/frequency lock purposes).Frequency ratio:Ξ(⁴⁹Ti) = 5.639037 % [based on the reference substance]Chemical shift range:ca. 2800 ppm [-1400 to +1400]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 27) and isobaric (same nucleon number A = 49) with Titanium-49. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 27	Isobar A = 49
11	³⁸Na
12	³⁹Mg
13	⁴⁰Al
14	⁴¹Si
15	⁴²P
16	⁴³S	⁴⁹S
17	⁴⁴Cl	⁴⁹Cl
18	⁴⁵Ar	⁴⁹Ar
19	⁴⁶K	⁴⁹K
20	⁴⁷Ca	⁴⁹Ca
21	⁴⁸Sc	⁴⁹Sc
22	⁴⁹Ti	⁴⁹Ti
23	⁵⁰V	⁴⁹V
24	⁵¹Cr	⁴⁹Cr
25	⁵²Mn	⁴⁹Mn
26	⁵³Fe	⁴⁹Fe
27	⁵⁴Co	⁴⁹Co
28	⁵⁵Ni	⁴⁹Ni
29	⁵⁶Cu
30	⁵⁷Zn
31	⁵⁸Ga
32	⁵⁹Ge

External data and identifiers

InChI Key:RTAQQCXQSZGOHL-OUBTZVSYSA-NSMILES:[49Ti]PubChem:ID 131708404Adopted Levels, Gammas:NuDat 49Ti

Literature and References

[1] - Francis William Aston:
The isotopic constitution and atomic weights of hafnium, thorium, rhodium, titanium, zirconium, calcium, gallium, silver, carbon, nickel, cadmium, iron and indium.
In: Proceedings A, 149, 867, (1935), DOI 10.1098/rspa.1935.0070.

[2] - T. J. Gray, J. M. Allmond, C. Benetti et al.:
Suppressed electric quadrupole collectivity in ⁴⁹Ti.
In: Physics Letters B, 855, 138856, (2024), DOI 10.1016/j.physletb.2024.138856.